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1
Mallinson, Phillip Martin. "Perovskite Microwave Dielectric Ceramics: Structure, Properties and Processing." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490899.
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Perovskite Microwave Dielectric Ceralnics: Structure, Properties and Processing PhD thesis, Phillip M. Mallinson, University of Liverpool This thesis describes the synthesis and characterisation of several new hexagonal perovskite materials and the investigation into the processing of a commercial microwave dielectric. Chapter 1 is in two parts, the first gives an introduction to the perovskite and hexagonal perovskite structural types, and reviews the structure and properties of reported hexagonal perovskites with the AnBn-\03n general formula. The second part reviews the literature on the microwave dielectric material Ba3ZnTa209 (BZT). In Chapter 2 the details of the synthetic and analytical techniques employed are described. Chapter 3 describes the synthesis and characterisation of a number of new hexagonal perovskite materials. The eight layer compounds BagCoNb60 24 and BagCoTa6024 were found to crystallise with different structures in the space groups P 3ml and P63c11l respectively. A detailed structural description and comparison of the structures of the materials is given along with the dielectric and magnetic properties. The structure and dielectric properties of the six layer material Ba6Ca1l3Nb\4/30\g are also presented. Chapter 4 describes the synthesis and characterisation of two isostructural ten layer hexagonal perovskites with the formulas BalOMgo.25Ta7.903o and BaIOCoO.25Ta7.903o. Refinement of combined synchrotron X-ray and neutron powder diffraction data is used to determine the structures of the materials. The dielectric properties of the materials are reported and the links between dielectric loss and ordering and microstructure discussed. In Chapter 5 the results of an in-situ X-ray powder diffraction study of the ordering and domain growth ofBZT at temperatures between 1200 and 1500 °C is presented. The degree of ordering is quantified using two different methods and a rate of ordering calculated at each of the temperatures studied, from the rates of ordering the activation energy for cation transport is calculated. The ordered domain size is also quantified from the diffraction data and the dynamics compared to domain growth in other systems. Supplied by The British Library - 'The world's knowledge'
2
Wang, Wenjin. "La2/3TiO3 and Li1/2Nd1/2TiO3 based microwave dielectric ceramics." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488769.
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Baeraky, Thoria A. "High temperature measurements of the microwave dielectric properties of ceramics." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323185.
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Kipkoech, Erick R. "Structural and microwave dielectric properties of CaTiO3-based perovskite oxide ceramics." Thesis, University of Manchester, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488367.
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Lowe, Tristan. "Structural and microwave dielectric properties of xCaTiO3-(1-x)Li0.5Nd0.5TiO3 based ceramics." Thesis, University of Manchester, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488303.
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Greenacre, Neil Robert. "Measurement of the high temperature dielectric properties of ceramics at microwave frequencies." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339644.
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Measurements of the high temperature dielectric properties of ceramic materials at microwave frequencies have been made using two different experimental techniques.Data has been collected at frequencies from O.2GHz to 4.0GHz and for sample temperatures up to 1200°C. Detailed cross checking of the high temperature dielectric data obtained by the two techniques has been carried out with the help of other laboratories worldwide. An investigation of the applicability of dielectric mixture equations to practical measurement techniques is reported. The most reliabl~ estimates of permittivity were given by the Landau-Lifshitz, Looyenga equation or by a cube root extrapolation technique.Permittivity data obtained for a series of yttria stabilised zirconia samples, three differently processed silicon nitride samples and ten related glass compositions are presented. Analysis of the frequency and temperature dependence of both components of complex permittivity has been undertaken· in an attempt to identify the physical origins of the dielectric loss mechanisms. For the yttria doped zirconia samples results indicate two distinct loss mechanisms dominant over different temperature ranges. Below approximately 950K a hopping model involving short range motion of oxygen vacancies around fixed dopant ions is proposed. Above 950K thermally activated quantum mechanical tunneling of electrons is suggested as the dominant mechanism. A single loss mechanism for the entire temperature range involving the lattice loss of the silicon nitride network itself is indicated from the measurements of the hot pressed and pressureless sintered silicon nitride samples. For the reaction bonded silicon nitride samples there is evidence of a second loss mechanism due to additional ion impurities above 1410K. The measurements on the oxide glass systems add support to the belief that + 1 charged metal ions will dominate the dielectric properties of glass systems when present. The loss process has an increasing activation energy with increasing temperature which is seen to be consistent with ionic motion within the previously proposed random potential energy model. Differences in the complex permittivity with composition are attributed to variation in ionic size and metal ion-oxygen ion bond strength.
7
Lowndes, Robert. "Structural and microwave dielectric properties of ceramics of Ca(1-x)Nd2x/3TiOs." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/structural-and-microwave-dielectric-properties-of-ceramics-of-ca1xnd2x3tios(b09226c9-a0ca-4d06-997e-05a810beab23).html.
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Ca(1-x)Nd2x/3TiO3 and MgTiO3-Ca0.61Nd0.26TiO3 composite ceramics were prepared by the mixed oxide route and characterised in terms of their structure, microstructure and properties. Ceramics sintered at 1450-1500oC achieved better than 95% of the theoretical density. X-Ray diffraction (XRD) revealed that Ca(1-x)Nd2x/3TiO3 ceramics were single phase for all compositions. For x ≤ 0.39 the structure was Pbnm with lattice parameters of a = b = √2ac and c = 2ac and a tilt system of a-a-c+. Compositions with x ≥ 0.48 could be better described by a C2/m structure with lattice parameters of a = b = c = 2ac. Scanning electron microscopy (SEM) revealed that the ceramics had grain sizes in the 5-70 μm range with abnormal grain growth for Nd3+ rich compositions. Images revealed that the twin domains in CaTiO3 were needle shaped and on addition of Nd3+ the domain morphology becomes more complex. The needle domain morphology returns for Ca0.43Nd0.38TiO3. High resolution electron microscopy (HAADF-STEM and electron diffraction) was used to probe cation-vacancy ordering (CVO) in the lattice. It was found that there was no CVO for x < 0.48 whilst at x = 0.48 there was evidence of a transition to a short range CVO. A transition to long range ordering is almost complete for the Ca0.1Nd0.6TiO3. The structural characteristics of Ca(1-x)Nd2x/3TiO3 ceramics as a function of temperature were investigated using in-situ XRD and Raman spectroscopy. All compositions were found to have the same structure across the entire temperature range. The Raman spectroscopy as a function of temperature indicated a possible transition with similar characteristics to a Curie temperature in a ferroelectric ceramic. The transition temperature was dependent on the cation ordering with the ceramics with greatest degree of disorder having the lowest transition temperature. The microwave dielectric properties of the samples were measured by a cavity resonance method in the 2-4GHz range. The relative permittivity (εr) was found to decrease from 180 for CaTiO3 to approximately 80 for Ca0.1Nd0.6TiO3 with an exponential dependence between the composition and the property. The temperature coefficient of resonant frequency (τf) ranged from +770ppmK-1 for CaTiO3 to +200ppmK-1 for Ca0.1Nd0.6TiO3. The Q x f for CaTiO3 was found to be 6000GHz and this increased to a maximum of 13000GHz for Ca0.7Nd0.2TiO3. After the Ca0.7Nd0.2TiO3 composition, the Q x f decreased to approximately 1100GHz for Ca0.1Nd0.6TiO3. The εr and τf were found to be mainly dependent on the composition of the ceramics whilst the Q x f value was more complex being dependent on the width of the twin domains in the grains. CaTiO3 samples fabricated by spark plasma sintering at 1150oC and above achieved better than 95% of the theoretical density. XRD revealed only a single phase with an orthorhombic Pbnm structure at room temperature and a tilt system of a-a-c+. SEM confirmed that the samples were single phase with grain size between 500nm-5μm. Transmission electron microscopy (TEM) of specimens sintered at 1150oC showed evidence of both (011) and (112) type domains. The τf of the ceramics was shown to be dependent on the volume of the unit cell, in agreement with the Bosman-Havinga equations. The ceramic sintered at 1150oC showed improvement in the Q x f value compared to samples prepared by conventional sintering. The structure, microstructure and properties of composite ceramics based on the MgTiO3-Ca0.61Nd0.26TiO3 system were investigated. Optimum properties were achieved at a composition of 0.8MgTiO3-0.2Ca0.61Nd0.26TiO3 with τf = -0.1ppmK-1, Q x f of 39000GHz and εr of 25.4. XRD revealed the presence of 3 phases including Ca0.61Nd0.26TiO3, MgTiO3 and MgTi2O5. The grain size of the ceramics was typically 5μm. The Q x f value was sensitive to the cooling rate and these changes could be related to changes in the vibrational properties of the lattice through changes in the lattice parameters.
8
Evans, N. G. "The dielectric properties of ceramics at 2.45GHz and their influence on microwave firing." Thesis, Staffordshire University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261222.
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Wise, Peter Leonard. "Structure-microwave dielectric property relations in Sr and Ca titanates." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391169.
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Zhe-WeiXie and 謝哲偉. "Microwave Dielectric Properties and Microwave Applications of 0.9Li2MgTi3O8-0.1Li2ZnTi3O8 Dielectric Ceramics." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/04456037954712865085.
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Tsai, Chih-Hung, and 蔡志泓. "Microwave dielectric properties of YNbO4 ceramics." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/92325415580090647450.
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碩士崑山科技大學
電子工程研究所
101
YNbO4 microwave dielectric ceramics prepared by a reaction-sintering process were investigated. The mixture of raw materials was sintered directly and no calcination stage was involved. Single phase YNbO4 ceramics with monoclinic structure were obtained. Sintering temperature was lowered with the addition of CuO and some Cu-rich phases formed at the grain boundaries. Maximum density 5.14 g/cm3 and shrinkage 15.02% were found in 1250oC/6h sintering YNbO4 with 0.3wt.％ CuO addition（YNC3）. Maximum density 5.09 g/cm3 and shrinkage 16.9% were found in 1100oC/6h sintering YNbO4 with 0.3wt.％ CuO addition（YNC5）. Microwave dielectric properties: εr＝15.53, Qxf＝14,174 GHz (10.33GHz) and τf＝－39.73 ppm/oC were obtained for 1300oC/6h sintering YNC3 ceramics. εr＝15.69, Qxf＝18,420 GHz (10.17GHz) and τf＝－35.76 ppm/oC were obtained for 1250oC/6h sintering YNC5 ceramics.
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Wu, Cheng-Che, and 吳政哲. "Research and Applications of Microwave Dielectric Ceramics." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/83025206740256626511.
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碩士國立成功大學
電機工程學系
89
It is found that low-level doping of ZnO (1wt%) and V2O5 (up to 2 wt%) can significantly improve the densification ability and the dielectric properties of (Zr0.8,Sn0.2)TiO4 ceramics. (Zr0.8,Sn0.2)TiO4 ceramics with additives could be sintered to a theoretical density higher than 95% at 1300℃ due to the liquid-phase effect of V2O5 addition. The dielectric constant (εr) increased with increasing sintering temperature and saturated at 1300℃. The temperature coefficient of resonant frequency (τf) was not significantly affected while the unloaded quality factor Q was promoted by V2O5 addition. Theεr value of 37.3, the Q×f value of 51500 (at 7 GHz) and theτf value of -2.1ppm/℃ were obtained for the 1wt% ZnO-doped (Zr0.8,Sn0.2)TiO4 ceramics with 1wt% V2O5 addition sintered at 1300℃. (1-x)CaTiO3-xCa(Mg1/3Nb2/3)O3 solid solution exhibited orthorhombic crystal structures for all compositions. With x=0.66, a new microwave dielectric ceramic material 0.34CaTiO3-0.66Ca(Mg1/3Nb2/3)O3 is suggested and possesses the dielectric properties of a dielectric constant εr of 48, Q×f value of 32500 (at 6.7GHz) and a τf value of -2ppm/℃ at 1450℃ for 3h. Further improvement of the Q×f value can be achieved by extending the sintering time to 6h. It reveals a higher Q×f value of 34000 (at 6.7GHz) without degrading other microwave dielectric properties of 0.34CaTiO3-0.66Ca(Mg1/3Nb2/3)O3 ceramics. In the recent, miniature and low cost bandpass filters are very important in mobile communication systems. The planar filter structure is one of the possible choices for its compactness when realized with a high dielectric constant substract. In the paper, we used microstrip hairpin resonators to fabricate microwave bandpass filter based on direct-coupled mechamism. In the aspect of the filter substract manufacture, we used ZST and Al2O3 to be the substracts of the filter. ZST have been used due to its good temperature stability, high Q value and high relative dielectric constant, respectively so that the filter can be miniaturized and realized good frequency response.
13
Ruei-ZhungLee and 李瑞中. "Improved Dielectric Properties and Applications of ZnTiNb2O8 Microwave Dielectric Ceramics." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/53697400866674740761.
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Lin, Shih-Hung, and 林士弘. "Improved Microwave Dielectric Properties and Application of Mg0.95Co0.05TiO3 Dielectric Ceramics." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/79398852645936487319.
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碩士國立成功大學
電機工程學系碩博士班
93
Improved Microwave Dielectric Properties and Applications of Mg0.95Co0.05TiO3 Ceramics Shih-Hung Lin* Cheng-Liang Huang** Department of Electrical Engineering National Cheng Kung University, Taiwan, R.O.C. Abstract The microwave properties of Mg0.95Co0.05TiO3dielectric ceramic materials are discussed in this paper. By adding different sintering aids ZnO and CuO respectively, we study the existence effects of liquid phase for the microwave properties of Mg0.95Co0.05TiO3. The experiment results show that with 1wt% ZnO addition can efficiently reduce sintering temperature from 1350 oC to 1250 oC, and we obtain that the dielectric properties are εr~28，Q×f~50000(GHz) and τf~14(ppm/oC). Concerning about the negative value of τf , we choose adding the Zn0.975Ca0.025TiO3 (+30(ppm/oC)) to adjust the value approaching to zero. At 1200 oC, 0.7Mg0.95Co0.05TiO3-0.3Zn0.975Ca0.025TiO3appears the best property: εr~22.6, Q×f~57000(7GHz) andτf~0(ppm/oC) . Hence, the microwave properties of dielectric ceramic materials is improved.. Hence, the microwave properties of Mg0.95Co0.05TiO3 dielectric ceramic materials is improved. In addition, we design and fabricate a third order compact elliptic function low-pass filters using microstrip stepped-impedance hairpin resonators with 1.8GHz 3dB cutoff frequency on FR4、Al2O3、 Mg0.95Co0.05TiO3 substrate. *The Author **The Advisor
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Chen, Kung-Chung, and 陳光中. "The microwave dielectric properties of composite ceramics/polymer and ceramics/glass." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/91497036388819774364.
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碩士國立交通大學
材料科學與工程系
88
Due to the rapid growth of communications industry using microwave frequencies, such as car telephones and portable phone, has created a demand for the greater miniaturization and better characteristics of components such as band pass filters and local oscillators. Therefore, studying the microwave dielectric materials becomes more and more important. First, this article reports on a study of the microwave dielectric properties of ceramics dispersions in a polymer matrix. Samples investigated in this study are composed of ceramics powders(HF22K, HF37N, MSZT40S(B), MBT40B, MRT45B, HF90HQ, Al2O3, TiO2, BaO-La2O3-4TiO2, and BaO-La2O3-4.7TiO2)randomly dispersed, with a desired volume concentration, in a polymer（PVDF) matrix. The experimental values of dielectric constant are compared to those obtained by using different dielectric constant mixing laws. Only Lichtenecker formula can agree with experiments, but there is no effective model to predict the dielectric loss and the temperature coefficient of resonant frequency . The second part of the study, we discuss the relationship between the dielectric constant of ceramics/glass composite and glass additions. In this part, we use commercial glass (GA9, GP5210, and EG3606) as a matrix and ceramics (Al2O3, BaO-La2O3-4TiO2, and BaO-La2O3-4.7TiO2) as dispersions. If ceramics and glass is reacted, Lichtenecker formula is fail to predict the dielectric constant of the ceramics/glass composite.
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Chen, Yu-Ruei, and 陳昱瑞. "Microwave Dielectric Properties and Applicationsof Modified Mg4Nb2O9 Ceramics." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/98738032291339233864.
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碩士國立成功大學
電機工程學系碩博士班
96
The influence of adding sintering aids on dielectric properties and microstructure of the ceramic microwave dielectric materials Mg4Nb2O9 was investigated. The dielectric constant of Mg4Nb2O9 is 12.9, Q×f is 210000GHz, and τ�� is -70.4 ppm/°C. Nevertheless,the sintering temperature is around 1400℃, and sintering time must approach to 10 hours.Trying to add different sintering aids Fe2O3、ZnO and WO3 respectively in order to decrease the sintering temperature and time. And concern about whether the dielectric properties and microstructure would be affected by adding the sintering aids.According to the experiment results, the sintering temperature would be decreased to about 1270°C ~1330°C by adding different sintering aids, and the sintering time also be reduced to 4 hours. The sintering aids which has the best dielectric properties is Fe2O3.With 0.75wt% Fe2O3 addition, the dielectric constant is 13.46, Q×f is 280000GHz (at 11GHz) and τ�� is -62 ppm /°C.Furthermore, a square patch resonator of bandpass filter was designed and fabricated. The filter which center frequency is 2.45GHz and bandwidth is about 25% was realized on FR4, Al2O3 and Mg4Nb2O9 with 0.75wt% Fe2O3 doped substrates. And discuss the difference between the results of simulation by the software HFSS and measurement.
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Liu, Shi-Sheng, and 劉士生. "Microwave Dielectric Properties and ApplicationsOf (Mg0.95Zn0.05)TiO3 Ceramics." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/64299864176379497383.
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碩士國立成功大學
電機工程學系碩博士班
92
The microwave dielectric properties and the microstructures Of the series of (Mg0.95Zn0.05)TiO3 ceramics system were investigated. The microwave dielectrics properties are strongly correlated with the sintering temperature. At 1300oC for 4h,the (Mg0.95Zn0.05)TiO3 ceramics can give εr〜17.05,Qxf value〜264000GHZ(at11GHZ) and a �輎 value of〜-40.31ppm/oC. By appropriately adjusting the CaTiO3 in the series of (Mg0.95Zn0.05)TiO3 ceramics system, approach zero f value can be achieved .The CuO additives lowered the sintering temperature Of 0.95(Mg0.95Zn0.05) TiO3-0.05CaTiO3 ceramics to the range 1175oC〜1250oC.A dielectric constant ofεr〜21.48,a Qxf value of 125600GHZ(at 9.6GHZ) and a �輎 value of〜-5.95 ppm/oC was obtained for 0.95(Mg0.95Zn0.05)TiO3-0.05CaTiO3+0.5wt% CuO ceramics sintered at 1225oC for 4h. On another hand, we use three ceramic dielectric materials: FR4, Al2O3 and 0.95(Mg0.95Zn0.05)TiO3-0.05CaTiO3+0.5wt% CuO. to fabricate the substrate. In this thesis, the characteristics of a wide-band microstrip bandpass filter with the designed center frequency of 5.4 GHZ where reported. The filter used in this work was composed of the ring resonator. And we compared the result of the simulation with the result of the measurement of the performance.
18
Chen, Gwan Tin, and 陳冠廷. "Preparation and Analysis of Microwave Dielectric Ceramics Filters." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/02118087372750924532.
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碩士國立成功大學
電機工程研究所
81
Filter is one of the important devices in micro wave circuits. Traditionally, the volume of the microwave filter is large. However, dielectric cer amics filter has the advantages of high dielectric constant, high Q value, compact in size,good tempe rature stability,and low cost,it has already been widely used in the mobile communicaion system. Dielectric ceramics filters investigated in th iswork areconsisted of several cascaded resonators propagating in TEM mode.The electromagnetic energy istransmitted through air hole between neighboring resonators. The filter response can becontrolled by adjusting the dimension of the air holes. In this work, filters with different features w ere studied.The one that can best fit the require ment o the mobile communicationsystem at the frequ enciesfrom 800 MHz to900 MHz was found to have the features:central frequency f=819.5MHz,S=-31.135dB, S=-2.1783 dB, Bandwidth=25MHz, stopband loss at 750 MHz > 50dB.The dimension ofthe filter was designed to be 24 mm *8 mm*10 mm.
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Wong, Min-Jhe, and 翁敏哲. "Study and Application of Novel Microwave Dielectric Ceramics." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/30754833156444819093.
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碩士龍華科技大學
電機工程系碩士班
103
In this study, microwave dielctric properties of Ca(Nb1-xTax)2O6(x=0-0.1), Nd2MeO6 (Me=Mo、W) and NdTi0.5W0.5O4 were investigated. The CaNb2O6 ceramics were prepared by the conventional solid-state method with various sintering temperatures. The CaNb2O6 ceramics were synthesized and some of the Nb5+ ions were substituted by Ta5+ ions to improve Q×f. The CaNb2O6 ceramic sintered at 1400 ℃ for 4 h had a dielectric constant of 18.1, a Q×f of 50,000 GHz, and a temperature coefficient of resonant frequency of -54 ppm/℃. The Ca(Nb0.93Ta0.07)2O6 ceramic sintered at 1400 ℃ for 4 h had a dielectric constant of 17.7, a Q×f of 117,300 GHz, and a temperature coefficient of resonant frequency of -51 ppm/℃. The Nd2MoO6 sintered at 1350 ℃for 4 h had a dielectric constant of 13.8, a Q×f of 66,400 GHz, and a temperature coefficient of resonant frequency of -53 ppm/℃. The L-shaped monopole antenna was realized on FR4 and Nd2MoO6 ceramic substrate. The Nd2MoO6 ceramic substrate has 1.6 mm of thickness, and a dielectric constant of 13.8. The antenna area of L-shaped monopole antenna using Nd2MoO6 ceramic substrate can be reduced by 31.48 %, as compared with that using FR4 substrate. The 6 dB S11 bandwidth of the proposed antenna covered WLAN and WiMAX bands simultaneously. The proposed antenna has a 6 dB return loss with bandwidth 11.44 %, 22.87 %, and 23.94 % in the lower, middle, and higher bands, respectively. The proposed antenna has peak gain about 2.02, 4.41 and 5.55 dBi in the lower, middle, and higher bands, respectively.
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Hou, Jiun-Liang, and 侯俊良. "Dielectric Properties and Microwave Applications of MCT Ceramics." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/42485694358758399366.
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碩士國立成功大學
電機工程學系碩博士班
93
Abstract The microwave properties of 0.95MgTiO3 – 0.05CaTiO3 dielectric ceramic materials are discussed in this paper. By adding different sintering aids ZnO、B2O3 and SiO2 respectively, we study the existence effects of liquid phase for the microwave properties of 0.95MgTiO3 – 0.05CaTiO3. There are three part about the dielectric material. First, we discuss the properties of 95MCT with single sitering aids. Second, we discuss 0.95MgTiO3 – 0.05CaTiO3 adding a trace of ZnO. Third, we mix 0.95MgTiO3 – 0.05CaTiO3 with those three different sintering aids.. The experiment results show that 0.95MgTiO3 – 0.05CaTiO3 with 1wt% ZnO addition can efficiently reduce sintering temperature to 1350 oC, and it appears the best property: εr~20.3, Q×f~66300. Hence, the microwave properties of 0.95MgTiO3 – 0.05CaTiO3 dielectric ceramic materials is improved. In addition, we design and fabricate compact SIR band-pass filters with 2.4GHz central frequency and 10% bandwidth on FR4, Al2O3 and 0.95MgTiO3 – 0.05CaTiO3 substrates.
21
Hsu, C. S., and 許正興. "Characterization of Zr0.8Sn0.2TiO4 Dielectric Ceramics at Microwave Frequencies." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/41601849901850659288.
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碩士國立成功大學
電機工程學系
87
（Zr，Sn）TiO4 is a one of the important material systems for microwave dielectric resonators. The ceramic dielectric resonators with high dielectric constant , low dielectric loss and low temperature coefficient of frequency are applied to microwave integrated circuits widely. Because the component was scaled down , the characterization of ZST thin films were researched in recent years. This thesis studies the microwave dielectric properties of the dielectric resonators with the optimal composition of Zr0.8Sn0.2TiO4 by adding 1wt% ZnO and while changing the sintering temperature. The experiment results show that the dielectric constant , the quality factor and the temperature coefficient of frequency increase with increasing the sintering temperature. When the sintering temperature is 1400℃, we can find the best microwave dielectric characterization.(εr=38.13，Q=4564，τf=0 ppm/℃) On another hand , we use the best sintering process to fabricate the ZST target. The ZST thin films were fabricated by the rf sputtering and tried to get the best structure of thin films with changing the substrate temperature , sputtering time and Ar/O2 ratio . In this experiment , we can discover that the substrate temperature was increase and the Ar/O2 ratio was decrease , the structure of thin films were better and the sputtering ratio was increase. And than we find the better properties that substrate temperature is 400℃ , sputtering time is 4hr , operation power is 4mtorr , Ar/O2 ratio is 90/10 and the maintained temperature is 400℃ for 2hr. In the future , we can try to make the more process conditions to get the best structure and than apply to design the device .
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Tsai, Jsung-Ta, and 蔡宗達. "Study of microwave dielectric ceramics and implementation of microwave bandpass filters." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/20922954526095742334.
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博士國立成功大學
電機工程學系
89
Microwave dielectric resonators have attracted much attenuation in the recent years, since they feature small size, lightly weight, high Q and low cost as compared with those of waveguide or cavity resonators. Dielectric materials for practical use must have a high r, high f·Q value and good temperature stability for the resonant frequency change. There are several temperature stable dielectric ceramics containing TiO2 explored such as (Zr, Sn)TiO4, (Pb, Ba)O-Sm2O3-TiO2, CaO-Li2O-Ln2O3-TiO2, etc. Since (Pb, Ba)O-Sm2O3-TiO2 system has r higher than 90, they can significantly miniaturize the resonators when the operating frequency is within UHF band. They are commercially available for more than ten years. In 1993, the CaO-Li2O-Ln2O3-TiO2 system has been proposed. It features high permittivity and high temperature stability for the resonant frequency. The system can realize dielectrics with permittivity greater than 100. The main purpose of this thesis is to investigate the microwave properties of the above and the related ceramic systems and further to modify them. The CaO-Li2O-Ln2O3-TiO2 system with the non-stoichiometric composition of CaO : Li2O : Sm2O3 : TiO2 = 16 : 9 : 12 : 63 was chosen for the study. CaO was replaced by BaO in the experiment. From the obtained results, we found Ba ion cannot be tolerated in the Ca-based perovskite and result in the presence of secondary phase of BaSm2Ti4O12. The replacement of Nd2O3 for Sm2O3 was also proceeded. Microwave dielectric property change accompanying the composed phases was investigated. The major improvement in the study would be the progress in Qd. The other ceramic system investigated here is Ca1-xLa2x/3TiO3-(Li1/2,Nd1/2)TiO3. It is a combination of Ca1-xLa2x/3TiO3 and (Li1/2,Nd1/2)TiO3. The Ca1-xLa2x/3TiO3 solid solution is first synthesized for reducing the temperature coefficient for the resonant frequency and increasing the quality factor. Then, (Li1/2,Nd1/2)TiO3 is added to the system for a further improvement. Finally, the temperature stable ceramic is obtained. It also exhibits a high permittivity and an acceptable quality factor at microwave frequencies. The other objective in this thesis is about the design and implementation of bandpass filters. Two types of filter are introduced here. One has coupled stepped impedance resonators arranged in comb-line configuration and tapped I/O to feed in and out the signals. The filter is modeled to provide the design equations for this type of filter. The other one is developed by adding attenuation pole resonators to a conventional comb-line filter. The filters implemented here features multi-poles located in the stopband. The frequency responses show good flexibility for the duplexer. Both of the measured results coincide with the simulation results well. They can meet the requirement of today’s wireless communication system.
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Huang, Chung-Chia, and 黃鐘加. "Microwave Dielectric Properties and Applications of (ZnAl2O4-TiO2) Based Microwave Ceramics." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/94526794332538136375.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
96
The microwave dielectric properties and the microstructures of the series of ZnAl2O4-TiO2 ceramics system were investigated. The experiment results show that ZnAl2O4-TiO2 has the best properties with sintering temperature at 1390℃, the dielectric properties are εr~ 25.2 , Q×f ~ 277000 (at 9GHz) , and τƒ~ 185ppm/℃. Concerning about the positive value of , we choose to add the Mg4Nb2O9(εr~12.9、Q׃~210000、τƒ~-70.4ppm/℃) 、MgTiO3(εr~17、Q׃~160000、τƒ~-55ppm/℃)及Mg0.95Ni0.05TiO3(εr~16.8、Q׃~230000、τƒ~-54 ppm/℃)to adjust the value. Besides, a circle dual-mode microstrip bandpass filter on FR4、Al2O3 and 0.5Mg4Nb2O9-0.5(ZnAl2O4-TiO2) substrates have been designed. The band-pass frequency is 2.5GHz, the bandwidth is 8% and simulated by electromagnetic simulation software, HFSS.
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Chun-An, Lu, and 盧俊安. "Processing of BaO-Sm2O3-TiO2 system Microwave Dielectric Ceramics." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/63494295679730270866.
Full textAbstract:
碩士國立臺北科技大學
材料及資源工程系碩士班
89
The miniaturization of microwave telecommunication productions can be achieved by miniaturizing the microwave devices using IC design and modulation. The small volume and good quality of devices can be effective improved by the more stable and reliable dielectric materials. BaO•Ln2O3•4TiO2 (Ln = La, Pr, Nd, Sm and Gd) system with a high dielectric constant, a low temperature coefficient of resonance frequency, tf, and a high Q factor is well known to be use in microwave telecommunication. This research is to study the effects of the temperature and soaking time on the calcining and sintering in solid-state process. A hybrid method of hydrothermal synthesizing BaO•Sm2O3•4TiO2 dielectric ceramic powders was investigated. The initial results show that the BaSm2Ti4O12 phase can be sintered at temperature lower than 1200℃.
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Liu, Yuan-Wen, and 劉元文. "Effects of Pb2+ addition on La4Ti9O24 microwave dielectric ceramics." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/p94cm4.
Full textAbstract:
博士國立交通大學
材料科學與工程系所
94
In this study, it was performed a systematic investigation of La4Ti9O24 ceramics with various Pb2+ doping and further discussed the correlation with the La2/3TiO3-type phase. The main structure of this study includes three parts: In the first part, it was investigated the interaction between Pb2+ and La4Ti9O24 ceramic bulk. The result shows that a significant Pb2+ diffusion into La4Ti9O24 ceramic bulk and a significant crystallization of the La2/3TiO3-type phase is clearly observed in the Pb2+ diffusion layer. The reacted zone consists of the La2/3TiO3-type phase exhibits the linear dependence of the square of the thickness, x, on the heat-treated time, t, in excellent agreement with the parabolic law x2 = kt, where k is the growth rate coefficient. The kinetic study thus indicates that the Pb2+/La4Ti9O24 interaction strictly obeys the theory of the reactive diffusion. Furthermore, the experimental k values were used to determine the associated activation energy, Ea, for the formation of La2/3TiO3-type phase using the Arrhenius plot and the following least-square equation, ln (k) = -Ea/RT + A, where T is the annealing temperature, R is the universal gas constant, and A is a constant, resulting in Ea ~ 607 �b 60 kJ/mol. The second part reveals the crystalline structure of La2/3TiO3-type phase with Pb2+ doped. From the results of electron diffraction and Rietveld analysis of the X-ray powder diffraction patterns, we find that the La2/3TiO3-type phase crystallizes in the orthorhombic space group Ibmm (No. 74) with a = 0.55371 nm, b = 0.55064 nm, and c = 0.77825 nm In the third part, we investigated the influence of lead and/or zinc containing borosilicate glass addition on the sintering temperature and the microwave dielectric property of La4Ti9O24 ceramics. With the glass addition above 20 vol%, La4Ti9O24 ceramics with >95% of the theoretical density can be achieved at �T1000 oC. The crystalline intensity of the La2/3TiO3-type phase increases significantly with the increase of lead containing borosilicate glass addition due to the Pb2+-induced phase transition. The change in the crystalline phase has appreciable effects on the microwave dielectric property (at 3 GHz), εr ~ 20—80, Q ~ 1600—1000, and TCF ~ 0—190.
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Sung, Chuan-Chun, and 宋顓均. "Ultra-low fire of Zn2Te3O8-TiTe3O8 Microwave Dielectric Ceramics." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/x8bxdq.
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碩士國立臺北科技大學
材料及資源工程系研究所
98
TeO2 compound possess a low sintered temperature and good microwave dielectric properties but with a high τf which cause the material fail to be applied. For improving the properties, its compounds Zn2Te3O8 and Ta2Mo2O11 are synthesized and studied. Zn2Te3O8 ceramic has a low sintered temperature and a high quality factor, however, it has a high temperature coefficient of approximately -37 ppm/℃. To lower the temperature coefficient, the materials TiTe3O8 and H3BO3 with positive τf-value was added into the Zn2Te3O8 ceramics and their densification behavior, phase conponents, microstructure and dielectric properties were investigated. The results show the TiTe3O8 additive could increase the dielectric constant, but the dielectric loss also increaseed, that cause the quality factor to drop, At the sintered temperature of 600°C the optimum microwave dielectric properties obtained were εr ~19.7, Q×f ~50042GHz, and τf ~3 ppm/℃. The study of Ta2Mo2O11 ceramics showed that the sample sintered at 750℃ for 2h has the dielectric properties: εr ~20.7, and Q×f ~8753GHz.
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Te, Pan Wei, and 潘維德. "Study of Microwave Mono-Block Ceramics Dielectric Resonators Filters." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/30272006470906140917.
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碩士樹德科技大學
電腦與通訊研究所
92
ABSTRACT Microwave mono-block ceramics dielectric resonators filters(DRF) with the advantages of high dielectric constant(εr), high Q value, good frequency temperature stability (τf), low loss, therefore dielectric resonators (DR) has become an important component in many communication systems such as microwave filters in satellite communication systems and cellular radio application. DR materials((Zr, Sn)TiO4) constant isεr =90, Q=2500 on 4GHz,τf =10.2 ppm/℃；characteristic is small volume, slight weight, use on high power, low cost, easy modify frequency error. A research reported frequency design on 800 ~ 1000 MHz (UHF；is shown in Fig.1-7) and will study result of use global system for mobile(GSM) for the international marketplace. The study main shaft has originality is drilling on short surface, moreover, combine the three outdated coupling method (1.Air Coupling 2.Windows Coupling 3.Comb-line Coupling) to work in coordination and to obtain a good frequency response, this is a good gains; to test DR the difference between has air hole and no air hole. But, the drilling on short surface proved to the electromagnetism theory for a research report to be not included in yet. Prove to 『Poor no need to be afraid, No ambition no everything』 for I have written a dissertation all the complicated process to overcome many apparatus and environment.
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Shen, Dao-Yuan, and 沈道遠. "Researches and Microwave Applications of (Mg0.95Co0.05)TiO3 Dielectric Ceramics." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/31313256661925630639.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
92
In this thesis, the dielectric ceramics properties and microstructure of 1-x(Mg0.95Co0.05)TiO3-xCaTiO3 were investigated. The V2O5 and B2O3 additives lowered the sintering temperature of 1-x(Mg0.95Co0.05)TiO3-xCaTiO3 due to the liquid phase sitering. With 0.25wt% V2O5, a dielectric constant of 21.73, a Qxf value of 93700(GHz), and a temperature coefficient of resonant frquency(τf) value of 1.8ppm/oC. In the recent, miniature filters are more much important in mobile communication systems. For planar filter structure, compact area can be obtained by a high dielectric constant substrate. To design a bandpass filter of center frequency at 5.8GHz, and based on a stacked stepped-impedance resonators. Using FR4、Al2O3 and 94MCCT+0.25wt%V2O5 be the substrate of the filter. Experimental results showed the advantages of low loss and smaller area on a high Qxf value and high relative dielectric constant substate.
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Hsu, Jui-Feng, and 許瑞楓. "Microwave Dielectric Properties and Applications of (Mg0.95Co0.05)TiO3 Ceramics." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/33310599284537479274.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
91
The microwave dielectric properties and the microstructures of the series of (Mg0.95Co0.05)TiO3 ceramics system were investigated. With partial replacement of Mg by Co, dielectric properties of the (1-x)(Mg0.95Co0.05)TiO3-xCaTiO3 and (1-x)(Mg0.95Co0.05)TiO3-xCa0.6La0.8/3TiO3 ceramics can be promoted. The microwave dielectric properties have strongly correlated with the sintering temperature. By appropriately adjusting the x value in the series of (Mg0.95Co0.05)TiO3 ceramics system, zeroτƒ value can be achieved. The CuO additives lowered the sintering temperature of 93MCCT ceramics to the range 1150℃~1225℃. With x=0.07, a dielectric constant of 22.13, a Q׃ value of 129500(at 7GHz) and a τƒ value of 0.51 ppm/℃ was obtained for 0.93(Mg0.95Co0.05)TiO3-0.07CaTiO3 +0.25wt%CuO ceramics sintered at 1200℃ for 4 h. In the recent, miniature and low cost bandpass filters are very important in mobile communication systems. In this thesis,the characteristics of a bandpass filter with the designed center frequency of 5GHz were reported. The filter used in this work was composed of the triangular resonator. This approach has advantages for a low loss and the compact filter structure. Experimental results of the filters were reported in terms of insertion loss and return loss.
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Chang, Shih-Chih, and 張仕哲. "Improved Microwave Dielectric Properties and Applications of MgTiO3 Ceramics." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/41701054333116140535.
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碩士國立成功大學
電機工程學系碩博士班
91
The systems of microwave dielectric properties of xMgTiO3-(1-x)Ca0.6Nd0.8/3TiO3、-(1-x)Ca0.6La0.8/3TiO3 and —(1-x)MgTa2O6 have been discussed in this paper .The results show that appropriately adjusting the x value ,zero τf value can be obtained . Besides ,a coupled line band-pass filter on FR4、Al2O3 and 0.5MgTiO3-0.5MgTa2O6 substrates have been design.The band-pass frequency is 2.375GHz,the bandwidth is 5%.
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Hsu, Jen-Chun, and 徐任均. "Study of Dielectric Properties on CaTiO3-ABO3 Microwave Ceramics." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/35ckha.
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碩士國立臺北科技大學
材料科學與工程研究所
95
Calcium-Titanate ceramics exhibit a combination of high permittivity ( εr ) about 170, and high Q×f = 6000 ~ 12,000 GHz, which make it a suitable candidate for microwave dielectric materials. The major disadvantage of CaTiO3 is its ultra high postive temperature coefficient of frequency ( τf ), it will discourages the development, hence have to blend to compensate with a ceramics with negative τf-value. The ReAlO3 and ReGaO3 with the pervoskite structure are doped in CaTiO3 by forming solid solution in this study. ReAlO3 and ReGaO3 with permittivity about 15-25, Q×f value from 50,000 to 100,000 GHz, and with a small negative τf from -30 to -70 ppm/oC. For the reason that is chosed to compensate for CaTiO3 with the high τf value. In the results, the behaviour on densification, phase assemblage, microstructure characteristics, and analysis on dielectric properties were be investigated. In the result of the study, the solid solutions ceramics prepared with different amount mol% NdAlO3 added in CaTiO3 via the solid-state reaction. Ceramics based on the 0.7CaTiO3+0.3NdAlO3 exhibits single phase, and with εr = 48, Q×f ~ 40,000, and τf = 16.03 ppm/oC, The LaGaO3 was chosen to carried out with high Q×f ~ 97,000. When the 36 mol% LaGaO3 added in CaTiO3 ceramics exhibits εr = 49, Q×f ~ 44,000, and τf = 14.6 ppm/oC. With the slower cooling rate of 0.5oC/min is useful for increasing Q×f values. The 0.7CaTiO3+0.3NdAlO3 ceramics with εr = 45.6, Q×f ~ 43,000, and τf near zero about 2 ppm/oC
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Sung, Yueh-Lun, and 宋月倫. "Process and Properties of ZnNb2O6 and MgNb2O6 Microwave Dielectric Ceramics." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/2jfsax.
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碩士崑山科技大學
電子工程研究所
93
Columbite ZnNb2O6 (ZN) and MgNb2O6 (MN) ceramics produced by a reaction-sintering process were investigated. The mixture of raw materials was pressed and sintered into ceramics without any calcination stage involved. Columbite ZN and MN phases could be obtained after 2h and 4h sintered at 1050 – 1350oC. A density value 5.57 g/cm3 (99% of the theoretical value) was obtained for 4h sintering at 1150oC in ZN pellets. The sintering temperature can be effectively reduced to 1000oC in ZN ceramics with 2wt% CuO additions. Mg0.652Nb0.598O2.25 and Mg0.66Nb11.33O29 phases were also found in the sintered MN ceramics. A density value 4.85 g/cm3 (97.1% of the theoretical value) was obtained for 2h sintering at 1250oC in MN pellets. The microwave dielectric properties єr~23.5, Q×f~61916GHz , τf ~-50ppm/oC and єr~17.3, Q×f~24886GHz , τf ~-78ppm/oC were obtained in ZN and MN, respectively. As TiO2 was added into ZN, τf values approach 0 ppm/oC could be found in 0.42ZnNb2O6－0.58TiO2. Good dielectric properties єr~38.1, Qxf~21676GHz and τf ~ -10ppm/oC were obtained in 0.42ZnNb2O6－0.58TiO2 ceramics sintered at 1200oC for 2h.
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Chien-YehWu and 吳建燁. "Study and Applications of Microwave Dielectric Ceramics(Mg1-xCox)La2Zr2O8." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/x964g4.
Full textAbstract:
碩士國立成功大學
電機工程學系
102
First, the microwave dielectric properties and microstructure of MgLa2Zr2O8 ceramics have been investigated. The experimental results show that MgLa2Zr2O8 has the best properties at sintering temperature 1490℃ for 12 hours, with ε_r~20.87, Q×f~ 10,3000GHz(at 8.65GHz), and τf ~－44.23ppm/℃. Then the Mg2+ from the MgLa2Zr2O8 had been substituted by Co2+, at x = 0.2, the sintering temperature is lowered to 1460℃, with ε_r~23.49, Q×f~82,0000, τf ~－42.21 ppm/℃.Second, a dual-mode square ring line-to-ring band-pass filter that operates at 2.45GHz was designed and fabricated. The bandwidth of the passband can be modulated by changing the perturbation size. In order to suppress spurious response, an open-stub was attached to the feed line. Finally, the pattern was implemented on FR4, Al2O3 and MgLa2Zr2O8 substrates. The measurement results show using the substrates with high dielectric constant and low loss can improve the performance and reduce filter size.
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Liang-ZhiChen and 陳亮志. "Microwave Dielectric Properties and Applications of (Co1-xZnx)Nb2O6 Ceramics." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/89491743417474918057.
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Wang, Chen-Sheng, and 王振盛. "Dielectric Properties and Microwave Applications of ZnO-B2O3-SiO2 Ceramics." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/51995129936812158635.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
94
Abstract The microwave properties of ZnO-B2O3-SiO2 dielectric ceramic materials are discussed in this paper. By adding different percentage CaTiO3, we study the effects of microwave properties. The material researches are divided into two parts in this thesis. Firstly, we discuss the microwave properties of ZnO-B2O3-SiO2. Then, we discuss the microwave properties of ZnO-B2O3-SiO2 by adding CaTiO3. The experimental results show that ZnO-B2O3-SiO2 with 15wt% CaTiO3 addition can be sintered to 900 oC/0.5hr, and we obtain the properties: εr~7.3；Q×f~4000 GHz； ~3.4 ppm/℃ In addition, we design and fabricate compact SIR band-pass filters with 2.44GHz central frequency and 5% bandwidth utilizing FR4, Al2O3 and ZnO-B2O3-SiO2 substrates.
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Wen, Chung-Kai, and 溫仲凱. "Study on Low Temperature Sintering (Zr0.8Sn0.2)TiO4 Microwave Dielectric Ceramics." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/50270603816019157454.
Full textAbstract:
碩士國立臺北科技大學
材料及資源工程系碩士班
92
(Zr0.8Sn0.2)TiO4 ceramics having a high dielectric constant (εr), high Q×f and near zero temperature coefficient of resonant frequency (τf), are widely used in commercial microwave filters and oscillators. (Zr0.8Sn0.2)TiO4 powders was sintered at 1650℃ for 4h, the sintered density was about 96％ theoretical density and had the dielectric properties：εr ~36, Q×f~ 48000, τf ~－1.5 ppm/℃. In low temperature sintering, the BaO-B2O3-SiO2-Li2O-CuO and ZnO-B2O3-SiO2-Li2O-CuO glasses effectively enhanced the sinterability, while the BaO-SiO2-TiO2-CuO glass did not. (Zr0.8Sn0.2)TiO4 ceramics with 10wt%BBSLC additive could be sintered to approach 94％TD at 1050℃, and gaveεr ~29.7, Q×f ~30300, τf ~－4.7 ppm/℃. The sample with sintered density ~84％TD, εr ~26, Q×f ＞4000, τf ~－0.4 ppm/℃ could be obtained by addition of 10wt%ZBSLC glass. (Zr0.8Sn0.2)TiO4 ceramics with 10wt%BBSLC additive could be sintered to close to 92％TD at 1000℃, and gaveεr ~27.3, Q×f ~15600, τf ~－9.2 ppm/℃ by reducing the particle size using planetary ball mill.
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Pan, Chung-Long, and 潘宗龍. "Study of MgTiO3 Dielectric Ceramics and Applications at Microwave Frequencies." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/39585123490168097152.
Full textAbstract:
博士國立成功大學
電機工程學系碩博士班
92
Due to the rapid developments of mobile communication, mobile telephone systems, and satellite broadcasting systems in recent years, how to design high-quality devices applied in analog circuits is one of the most important issues. There are two primary branches in this research. One part is to develop the dielectric ceramic systems that exhibit great dielectric properties. The other part is to design and realize the multilayer dielectric filters. 1. Study and fabrications of microwave dielectric resonators (a) Magnesium titanate (MgTiO3) ceramics is a popular dielectric material applied at microwave frequency. With the Mg:Ca ratio of approximately 95:5, MgTiO3-CaTiO3 ceramics gives ~21, Q ~8000 at 7 GHz, and a zeroτf value. It has found many applications in microwave systems such as in temperature-compensating-type capacitors, resonators and antennas. However, the sintering temperatures for al cases were as high as 1350 ~ 1450℃. In this thesis, the effect of Bi2O3, CuO and V2O5 addition on the sintering temperatures of MgTiO3-CaTiO3 ceramics has been investigated. (b) With partial replacement of Mg by Co in MgTiO3, the (Mg0.95Co0.05)TiO3 ceramics also having an ilmenite-type structure was reported to possess excellent dielectric properties with an value~ 16.8, a Q×f value~ 230000 at 10 GHz and aτf value ~ -54 ppm/°C. However, the (Mg0.95Co0.05)TiO3 ceramics has a negativeτf value. Thus, in order to obtain a small temperature coefficients of resonant frequency, the Ca0.6La0.8/3TiO3 was added in the (Mg0.95Co0.05)TiO3 phase. (c) Due to thin-film technology has become a major requirement for integration since integrated circuits have been applied in today’s microwave communication system and dynamic random access memories. In this study the electrical and physical properties of MgTiO3 thin films were fabricated by RF magnetron sputtering have been researched. A MgTiO3 target was prepared and used for deposition. MgTiO3 thin films were deposited at different processing parameters. The dependence of the physical and electrical characteristics on RF power, substrate temperature and Ar/O2 ratios were also investigated 2. Design and construction of microwave ceramics dielectric filters An extended configuration of steeped impedance resonators (SIR’s) filter is presented. The parallel stripline sections of SIR’s are coupled electromagnetically and a coupling capacitor is introduced. The creation of an attenuation pole near the passband was derailed. A design procedure for the two pole ectended filter is derived from an analysis using even- and odd- mode impedances. In addition, all of the stripline resonators and tapped I/O lines were arranged in the same layer, it could save the additional layer and simplify the manufacture process owing to its simple structure. Experimental filters were constructed by ceramic lamination technique. They exhibited excellent performances suitable for portable trlrphones.
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Lai, Bo-cheng, and 賴柏丞. "MICROWAVE DIELECTRIC PROPERTIES OF Mg1-xMxZr(Ta1-yVy)2O8 CERAMICS." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/60438750068880839747.
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碩士大同大學
材料工程學系(所)
103
MgZrTa2O8-based ceramics is studied for its microwave dielectric properties in this research. The study is divided into three parts. The first part is to investigate microwave dielectric properties of MgZrTa2O8. The results show that it formed a single wolframite structure. It reached highest density after sintered at 1350 ℃. Its properties were: εr = 19.45; Q×f = 54,031 GHz; τf = -36.5 ppm /℃. The second part is to study the effects of Ca or Sr doping in MgZrTa2O8. In both kinds of doping, the sintered samples formed second phases of orthorhombic CaTa2O6 or SrTa2O6 , respectively, in addition to the main MgZrTa2O8 wolframite. The dielectric properties and the sinterability of the samples were impaired when large amounts of orthorhombic CaTa2O6 or SrTa2O6 were formed. Nevertheless, small amount of Ca doping (x=0.1) could improve the dielectric properties when orthorhombic CaTa2O6 was little. The third part was V substitution for Ta. The heat treatment temperatures were lowered because V2O5 has low melting temperature. Due the formation of V-containing phases, the samples exhibited low sintered density or even would be broken. The sample with the best sintered and dielectric properties was Mg0.9Ca0.1ZrTa2O8 (x = 0.1). Its properties were: density = 7.24 g/cm3; εr = 2.5; Q×f = 231,951 GHz; τf = -36.1 ppm /℃.
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Lin, Tung-Chieh, and 林東杰. "Study of Mg0.95Co0.05TiO3 Dielectric Ceramics and Applications at Microwave Frequencies." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/68945604565182904702.
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碩士國立成功大學
電機工程學系碩博士班
95
The microwave properties of Mg0.95Co0.05TiO3 dielectric ceramic materials are discussed in this paper. By adding different sintering aids ZnO and B2O3 respectively, we study the existence effects of liquid phase for the microwave properties of Mg0.95Co0.05TiO3. The experimental results show that with addition of 0.75wt% ZnO can efficiently reduce sintering temperature from 1350 oC to 1250 oC, and we obtain that the dielectric properties are εr ~22.22， Qxf ~70000 (9GHz) and τf ~ -28.0(ppm/oC). Concerning about the negative value of τf , we choose adding the Ca0.8Sm0.4/3TiO3 (+400(ppm/oC)) to adjust the value approaching to zero. At 1275 oC, 0.9Mg0.95Co0.05TiO3-0.1Ca0.8Sm0.4/3TiO3 appears the best property: εr~22.48, Qxf~108000(9GHz) andτf~ -8(ppm/oC). Hence, the microwave properties of Mg0.95Co0.05TiO3 dielectric ceramic materials is improved. In addition, we design and fabricate a Parallel-Coupled Line bandpass filters with designed center frequency of 5.8GHZ on FR4 、Al2O3 、MCT-CST substrate.
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Lin, Wen-Hsien, and 林文獻. "Preparation of Nd2Ti3O9-δMicrowave Dielectric Ceramics and It’s Microwave Properties." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/12333217180198495410.
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碩士中原大學
化學研究所
90
Reactive powders of stoichiometry Nd2Ti3O9-δ are prepared by mixed-oxide method with substitutions Ca, Sr, Pb and Al. The substitution of Nd by Ca, Sr and Pb or substitution of Ti by Al can readily promote the formation of single phase Nd2Ti3O9-δ. However, the better microwave properties are on the substitution of Al. The sintering temperature is increasing with more substitution of Al. But the dielectric conatant is decreasing and the Q*f value is increasing with the increasing of Al. Especially the τf changed form + value to — value. The best properties obtained is derived from the substitutional dopant Al, and the condition is Nd2(Ti0.6Al0.4)3O9-δ, the permittivity=40.48, Q*f=10260(at 7.17GHz) and τf=-14ppm/℃.
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Tsai, Chiao-Yi, and 蔡蕎伊. "Sintering Behavior and Microwave Dielectric Propertiesof BaWO4-Ba5Nb4O15 Composite Ceramics." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/fyn7kc.
Full textAbstract:
碩士國立臺灣大學
材料科學與工程學研究所
105
In the present study, the BaWO4 and Ba5Nb4O15 are sintered together to form composite. By adding 20, 40, 60, 80 wt% Ba5Nb4O15 into BaWO4, extra attention has been paid to the sintering behavior, microstructure, phase identification and microwave dielectric properties of composites. The preparation of pure BaWO4 and Ba5Nb4O15 has been done by sintering at 1100 °C and 1250 °C, respectively. As the sintering temperature was higher than 1100 °C, the cracks are spontaneously formed at the grain boundaries between BaWO4 grains; it is may due to the anisotropic thermal shrinkage and the vaporization of WO3. The relative density of Ba5Nb4O15 is also decreased after sintering above 1300 °C; it is likely due to the abnormal grain growth at elevated temperature. The composites with 20, 40 and 60 wt% Ba5Nb4O15 can be densified after sintering at 1350 °C. The relative density can reach above 92%~95%. The relative density of the composites with 80 wt% Ba5Nb4O15 reaches 90% after sintering at 1250 °C. The permittivity for the composites of 20, 40, 60 and 80 wt% Ba5Nb4O15 increases from 14 to 30 along with weight percent of Ba5Nb4O15. The permittivity of the composites follows the logarithm mixture law. The addition of 80 wt% Ba5Nb4O15 into BaWO4 exhibits the highest quality factor of 37000 GHz. To compare with other compositions, the microstructure without microcracks is a key factor to affect the quality factors. The BaWO4 and Ba5Nb4O15 show opposite tf values offsetting each other in the system. The tf value thus increases with the content of Ba5Nb4O15 as well. The tf value for the composites containing 40 wt% Ba5Nb4O15 is only 4.3 ppm/°C.
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StevenTantawi and 陳聖筆. "Microwave Dielectric Properties of Low Firable CoMoO4 and Li1.6Mn2.2Mo3O12 Ceramics." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/gm6994.
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Tzou, Wen-Cheng, and 鄒文正. "The Study and Fabrication of Liquid Phase Sintering Microwave Dielectric Ceramics and Microwave Devices." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/00767855783829696378.
Full textAbstract:
博士國立中山大學
電機工程學系研究所
91
Recently, the evolutions of wireless communication systems are growing rapidly to satisfy the personal communication requirements. Compact, small size, low cost, and multi-function are the major developing trends among these modern wireless communication devices. The use of ceramic materials with high permittivity can effectively reduce the sizes of microwave devices. This thesis consists of two parts: the research of microwave dielectric materials and the implementation of microstrip ceramic antennas. In the first part of the dissertation, the systematic investigations of the microstructure and microwave dielectric properties in respect of BiNbO4-based ceramics and MCAS glass-added Al2O3-TiO2 ceramics have presented. By the addition of CuO, V2O5, or CuO-V2O5 mixture, the BiNbO4 ceramics can be densified at lower sintering temperatures less than 940℃. The excellent microwave dielectric properties are obtained as 0.5 wt% CuO or V2O5 are added as sintering aids. The exceeded additive amount or sintering temperatures will result in the appearance of abnormal grain growth and the increase of grain boundary inclusions, which will decrease the microwave dielectric properties including the quality factor (Q) and the temperature coefficient of resonant frequency (τf). The CuO-added BiNbO4 ceramics reveal a negative τf value and V2O5-added BiNbO4 ceramics reveal a positive one. The τf values can be reduced to near 0 ppm/℃ by controlling the weight ratio of CuO/V2O5. Another method to reduce the τf values to near 0 ppm/℃ is the substitution of Sm for Bi. For the (Bi1-xSmx)NbO4 ceramics, the presence of the β-form of (Bi1-xSmx)NbO4 ceramics will affect the grain growth, density, Q×f values and τf values, but that has no apparent effect on εr values. On the whole, a high permittivity, an acceptable quality factor, and the temperature stable BiNbO4-based ceramic can be obtained. As for (1-x)Al2O3-xTiO2 ceramics, the addition of MCAS glass can lower the sintering temperatures of (1-x)Al2O3-xTiO2 ceramics from 1500℃ to 1300℃. And the τf value can be adjusted to near zero by controlling the TiO2 content and sintering temperature. The appearance of Al2TiO5 phase, resulted from the consumption of TiO2, exhibits intense effect on the microwave dielectric properties of (1-x)Al2O3 -xTiO2 ceramics. The major contributions in this research would be the lower sintering temperatures and the near 0 ppm/℃ of τf value. The 2wt%- MCAS-added (1-x)Al2O3-xTiO2 ceramics sintered at 1300℃ and x = 0.12 has a minimum τf value of –0.6 ppm/℃. In the second part of the dissertation, the microstrip antennas with high permittivity BiNbO4 ceramics (εr = 43) substrate are fabricated. The bandwidths obtained are narrow and insufficient for the WLAN application. The techniques of U-slots patch and stacked structure are used to enhance the bandwidth of the microstrip ceramic antennas by combining the two adjacent resonant modes. The results indicate that the impedance bandwidth can be enhanced from 2.3% to 5.3% by embedding double U-shaped slots in the rectangular patch, or to 4.5% by using stacked patches.
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Jayanthi, S. "Dielectric Titanate Ceramics : Contributions From Uncommon Substituents And Microstructural Modifications." Thesis, 2006. http://hdl.handle.net/2005/392.
Full textAbstract:
This thesis deals with the investigations on the dielectric properties of polycrystalline ceramics having uncommon substitutions in barium titanate and other related phases of BaTiO3-CaTiO3, MgTiO3-CaTiO3 and MgTiO3-BaTiO3 systems. After presenting a brief introduction on the ceramic materials studied in terms of their crystal structures, electrical properties, nonstoichiometry and microstructural characteristics. The thesis describes the synthesis of the ceramics and the methodology of different techniques utilized in characterizing the samples. Barium calcium titanate was synthesized through novel wet chemical techniques and the dielectric properties of calcium substituted barium titanate do not reveal multi-site occupancy whereas they are predominantly influenced by the A/B cationic ratio. The role of transition metals of the 3d series from vanadium (Z=23) to zinc (Z=30) in modifying the crystallographic phase content, microstructure and the dielectric properties of BaTiO3 ceramics containing 10 at% impurities were studied. All the transition metals brought about the phase conversion to hexagonal BaTiO3, although no systematics could be arrived at relating the hexagonal content to the 3d electronic configuration of the impurities. The relaxor dielectrics arising from the titanate solid solution with uncommon substitution and its interconversion to normal ferroelectrics is studied. The effects of cationic substitutions of iron and niobium for titanium in BaTiO3 pervoskite lattice in crystal symmetry and dielectric properties were investigated. The above dielectric characteristics are comparable in a converse way to those of the well known Pb(Mg1/3Nb2/3)O3-PbTiO3 system wherein the relaxor behaviour occurs within the lower lead titanate compositional limits. The modification in -T characteristics of positive temperature coefficient in resistance (PTCR) by the addition of segregative additives such as B2O3, Al2O3 etc in BaTiO3 and its conversion to grain boundary layer capacitance is studied. The presence of Al-related hole centers at the grain boundary regions resulted in charge redistribution across the modified phase transition temperatures due to symmetry-related vibronic interactions, which result in broad PTCR characteristics extending to higher temperatures. The processing of high permittivity ceramics by the manipulation of microstructural features in semiconducting BaTiO3 is studied wherein the grain boundary layer effect superimposed with the contributions from the barrier layers formed during electroding related to microstructure is proposed to be responsible for the unusual high permittivity in semiconducting BaTiO3. The influence of Mg2+ as a substituent in modifying the crystallographic phase contents, microstructure and the dielectric properties of (Ba1-xMgx)TiO3 ceramics, (x ranging from zero to 1.0 ) is studied. The results point to the dual occupancy of Mg2+ both in A and B sublattice and the role of oxygen vacancy as well as (Ti3+ –VO) defects in stabilization of hexagonal phase to lower temperatures. The microwave dielectrics of the BaMg6Ti6O19 phase formed in the compositional range of x=0.4 to 0.7 was investigated for suitable application in microwave dielectrics. Extensive miscibility between the ilmenite-type MgTiO3 and perovskite-type CaTiO3 over a wide compositional range is brought about by the simultaneous equivalent substitution of Al3+ and La3+. The resulting Mg1-(x+y)CaxLay)(Ti1-yAly)O3 ceramics exhibit improved microwave dielectric properties by way of high permittivity, low TCK and high quality factor. The elemental distribution reveals the complexity in the Mg/Ca distribution and its correlation with the solid state miscibility as well as dielectric properties. Microwave dielectric property of Mg4Al2Ti9O25 which is detected as secondary phase is studied in detail.
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SYU, RUEI-YANG, and 徐瑞陽. "Research and Applications of Zn2TiO4 Microwave Dielectric Ceramics and Thin Films." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/40421836650846005187.
Full textAbstract:
碩士龍華科技大學
電機工程系碩士班
104
In this study, microwave dielctric properties of Zn2TiO4, ZnNiTiO4 and ZnNi(Ti1-xMex)O4 (Me=Sn, Zr) were investigated. The Zn2TiO4 ceramics were prepared by the conventional solid-state method with various sintering temperatures. The Zn2TiO4 ceramic sintered at 1350 ℃ for 2 h had a dielectric constant of 20.7, a Q×f of 12,500 GHz, and a temperature coefficient of resonant frequency of -62 ppm/℃. The ZnNiTiO4 ceramic sintered at 1550 ℃ for 2 h had a dielectric constant of 17.1, a Q×f of 31,700 GHz, and a temperature coefficient of resonant frequency of -46 ppm/℃. The ZnNi(Ti1-xMex)O4 (Me=Sn, Zr) ceramics were prepared by the conventional solid-state method with various sintering temperatures. The ZnNi(Ti0.95Sn0.05)O4ceramic sintered at 1550 ℃ for 2 h had a dielectric constant of 16.7, a Q×f of 73,600 GHz, and a temperature coefficient of resonant frequency of -45 ppm/℃. The ZnNi(Ti0.99Sn0.01)O4 ceramic sintered at 1550 ℃ for 2 h had a dielectric constant of 17.3, a Q×f of 35,100 GHz, and a temperature coefficient of resonant frequency of -46 ppm/℃. A coupling U-shaped triple-band monopole antenna were realized on FR4 and ZnNi(Ti0.95Sn0.05)O4 ceramic substrate for comparison. The ZnNi(Ti0.95Sn0.05)O4 ceramic substrate has 1.5 mm of thickness, and a dielectric constant of 16.7. The antenna area of a coupling U-shaped triple-band monopole antenna using ZnNi(Ti0.95Sn0.05)O4 ceramic substrate can be reduced by 49.00 %, as compared with that using FR4 substrate. The 6 dB S11 bandwidth of the proposed antenna covered WLAN and WiMAX bands simultaneously. The proposed antenna had a 6 dB return loss with bandwidth 211 MHz, 225 MHz and 953 MHz in the lower, middle, and higher bands, respectively. The proposed antenna had peak gain about 2.20, 0.54 and -1.99 dBi in the lower, middle, and higher bands, respectively. Zn2TiO4 thin films were deposited by RF magnetron sputter. Zn2TiO4 thin films had a dielectric constant of 16.7, tangent loss of 0.11 and leakage current of 1.13×10-6 A/mm2 measured at 1 MHz when RF power and annealing temperature for 100 W and 900 ℃, respectively.
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Cheng, Ping-Shou, and 鄭平守. "The characteristics and applications of (Ba,Sr)Sm2Ti4O12 microwave dielectric ceramics." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/80088743786433791747.
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Liu, Kuang-Wen, and 劉光文. "Study and Fabrication of the Microwave Dielectric Ceramics Filter and Duplexer." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/77460184866780603787.
Full textAbstract:
碩士國立成功大學
電機工程學系
85
Today, Mobile telephone services are provided in various countries in the world. The mobile telephone equipment has made a great progress in achieving compactness and low power consumption to which the development of VLSI circuits. Other components which have grealty contributed to the above are filters and duplexers which are the key components of these equipment. Filters and duplexers very compact in size and very small insertion loss have become avaiable. In this thesis, the microwve filters and duplexers provide low insertion loss, good temperature stability and compact in size because the ceramics material of BSST system in high dielectric constant and high Q value was chosen in the fabrication. The filters comprise several stages of 1/4-coaxial dielectric resonators supporting the propagation of TEM mode, and the resonators are short-circuited at one end and open-circuited at the other end. According to the coupling type, the filter can be divided: (1)direct-coupled filter: The frequency response of the filter can be controlled by adjusting the coupling apertures between adjacent resonators. (2)comb-line coupling filter: We can get the frequency response of band-pass filter by depositing electrode patterning of different size on the open-circuited end. By this coupling method, we can make the filters into one block of ceramics body, reduce the volume and the cost of the filters. The duplexer was composed of two mono-block filters of different center frequency, one of which is tuned to the transmitting filter and the other to the receiving filter. We reduce the cross modulation distortion by insertion attenuation pole into the filter and spreading the attenuation pole over the passband of the opposite bandpass filter. The performance of the duplexer shows a 20dB/25MHz shape factor between the transmitter filter and receiver filter. The volume of this duplexer is less than 1.3 cm3.
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Cheng, Lung-Teng, and 鄭隆藤. "Densification Behavior and Dielectric Properties of BaO-R2O3-TiO2 Microwave Ceramics." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/93127986544488523768.
Full textAbstract:
碩士國立臺北科技大學
材料及資源工程系碩士班
91
The dielectric properties of BaO-R2O3-TiO2 ceramic system possesses a high dielectric constant (70 — 100), which are enable miniaturization of the dimensions of devices. In this study, the BaO-R2O3-TiO2 ceramics were prepared by a solid reaction method with lanthanide substitutions. The effects of composition modification and processing parameters on the densification behavior, microstructural evolution and microwave dielectric properties of BaO-R2O3-TiO2 ceramics were investigated. The results exhibited the Ba5.1(Sm1-yNdy)8.6Ti18O54 solid solutions with y = 0.5 have excellent dielectric properties ( εr = 91, Q x f = 907 GHz, τf = 7.3ppm/℃ ). Moreover, Ba5.1(Sm1-yLay)8.6Ti18O54 solid solutions with y = 0.25 also showed excellent dielectric properties ( εr = 90, Q x f = 1185 GHz, τf = 29.2 ppm/℃ ). However, Ba5.1(Pr1-yNdy)8.6Ti18O54 solid solutions didn’t show a near-zero temperature coefficient of resonant frequency. The results indicated only Sm based ceramics have a negative τf. As a result, Substitution of Nd, La and Pr for Sm will achieve the goal of a near-zero temperature coefficient of resonant frequency.
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Hsin-ChengLee and 李昕澄. "Microwave Dielectric Properties and Structure of Zn(Nb1-xTax)2O6 Ceramics." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/55207869927267962819.
Full textAbstract:
碩士國立成功大學
資源工程學系碩博士班
98
ZnNb2O6 with a columbite crystal structure have good microwave dielectric properties and sintered temperature about 1000-1200°C. The binary niobate compounds with general formula M+Nb2O6 was interested in last decade, and most of articles focus how the M+ effects dielectric properties of M+Nb2O6. In the past study, it is substituting small amount Nb5+ with Ta5+ of the ZnNb2O6 ceramics can forming solid solution Zn(Nb1-xTax)2O6. At this study sintering condition (sintering temperature 1150°C for 2 h), by increasing x, not only the microstructure, grain size but relative density (change from 96.1% to 96.7%) have not change obviously. But the Q×f (at 8.81 GHz) be tremendously boosted from 80,000 GHz at x= 0 to a maximum 130,000 GHz at x=0.05. On the other hand, Q×f decrease to the 88,000 GHz at x=0.1. Structurally, ixiolite can be regarded as a disorder form of columbite, and in the past study, when the ixiolite structure changes to columbite, the peak (040) will appear. At this study, the ordering degree (I040/ I040+ I031) is increase from 9.84 at x=0 to 13.41 x=0.05, so we conjectures the reason of Q×f increase is the ordering degree increase.
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Huang, Chi-ming, and 黃致銘. "Dielectric Properties and Applications of Mg0.95Ni0.05TiO3-based Ceramics at Microwave Frequencies." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/03722444765624044628.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
96
The microwave dielectric properties and microstructure of Mg0.95Ni0.05TiO3 ceramic materials are investigated in this study. The Mg0.95Ni0.05TiO3 ceramic possesses an dielectric constant (εr ) of 17.2，a Q×f value of 180,000 ( GHz )，a temperature coefficient of resonant frequency(τf) of -45 (ppm/℃) sintering at 1350℃ for 4 hrs. In order to obtain a temperature-stable material, a method of combining a positive temperature coefficient of resonant frequency material with a negative one was examined in the present study. Mg0.95Ni0.05TiO3 mixed with Ca0.6La0.8/3TiO3 [εr ~109，Q×f~17,000，τf ~ +212 (ppm/℃)]、La0.5Na0.5TiO3 [εr~122，Q×f~9600，τf ~ +480 (ppm/℃)] and Nd0.5Na0.5TiO3[εr~98，Q×f~7200，τf ~ +260 (ppm/℃)], respectively. The experimental results show that when x=0.15, (1-x)Mg0.95Ni0.05TiO3-xCa0.6La0.8/3TiO3 system obtain the dielectric properties: εr ~24.61，Q×f~102,000，τf ~ -3.6 (ppm/℃); when x=0.13, (1-x)Mg0.95Ni0.05TiO3-xLa0.5Na0.5TiO3 system obtain the dielectric properties: εr~23.22，Q×f~86,000，τf ~ +2.8 (ppm/℃); when x=0.19, (1-x)Mg0.95Ni0.05TiO3-xLa0.5Na0.5TiO3 system obtain the dielectric properties: εr ~25.61，Q×f~69,000，τf ~ -8 (ppm/℃). Finally, we design a three order Butterworth band-pass filter with hairpin shape on various substrates (such as FR4, Al2O3, and 0.87MNT-0.13LNT). The center frequency is 2.4GHz, FBW is 10%, and using full wave E.M. simulatior IE3D to discuss the difference between simulation and measurement.