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Schlub, Robert Walter, and n/a. "Practical Realization of Switched and Adaptive Parasitic Monopole Radiating Structures." Griffith University. School of Microelectronic Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040610.112148.
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Switched and adaptive parasitic monopole array radiating structures are investigated. Antenna design is orientated toward increasing practicability for implementation in terrestrial wireless communication systems. A number of antennas are designed with the aid of optimization and commercial simulation software. Simulation procedure was verified with the experimental manufacture and measurement of the arrays. The antennas presented in this thesis comprise an active monopole surrounded by a ring of parasitic monopoles. Parasitic radiators are constructed with static loading to enable simple experimental realization. Beam positions of an electrically steered equivalent antenna are thus simulated. Antenna symmetry ensures the beam can be reproduced throughout the azimuth. Complex antenna geometries require antenna design through optimization. A genetic algorithm is employed with HFSS and NEC for electromagnetic analysis. The robust optimization method couples with simulation software flexibility to provide an effective design tool for arbitrary structures. The genetic algorithm is employed strictly for design and not complete structural optimization. Dual band, five and six element switched parasitic antennas are presented. Lumped elemental loading along the radiators provide resonance and directed radiation at two GSM frequencies. Load value, radiator dimension and spacing are incorporated as design parameters. Experimentally built, 10dB return loss bandwidths of 17.2% and 9.6% and front to back ratios of 12.6dB and 8.4dB at 900MHz and 1900MHz respectively are measured. To reduce the ground requirements of monopole arrays, a skirted ground structure for switched parasitic antennas is analyzed. A six element switched parasitic monopole array with conductive ground skirt exhibits a front to back ratio of 10.7dB and main lobe gain of 6.4dBi at 1.575GHz. Radiation is not elevated despite lateral ground terminating at the parasitic elements. Skirt height is observed to linearly control radiation elevation, depressing the principal lobe through 40 degrees from 23 degrees above the horizontal. The Electronically Steerable Passive Array Radiator or ESPAR antenna is an adaptive parasitic monopole array. An ESPAR radiating structure incorporating a conductive ground skirt is designed for operation at 2.4GHz. Utility is confirmed with a frequency sensitivity analysis showing consistent electrical characteristics over an 8.1% bandwidth. The antenna design is improved with optimization to reduce average principal lobe elevation from 25 degrees to 9.7 degrees.
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Lourens, Jako. "A wideband monopole antenna design." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80026.
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Thesis (MScEng)--Stellenbosch University, 2013.ENGLISH ABSTRACT: The successful operation of a man-pack VHF jamming system requires a compact and efficient antenna operating over a wide bandwidth. The design of such an antenna is the focus of this thesis. The antenna should be of a practical size for a portable system and it must radiate energy efficiently across a frequency bandwidth in excess of a decade. A practical „target‟ specification of such an antenna has been drawn up based on the performance of a commercially available system. Several possible antenna topologies, each with a variety of loading section options, are tested using “Full wave” electromagnetic modelling (FEKO). Each topology/loading-section is numerically optimised for load element values by considering both its gain and reflection coefficient. Results of the „optimally loaded‟ solution for each topology are then compared to each other to arrive at the best overall design. The best result is found to be the traditional monopole whip-type antenna, with four R-L loading sections spread along its length. The simulated results show that the proposed antenna can be expected to meet the target standing wave ratio (SWR) specifications while offering a gain advantage of between 5 and 10 dBi higher than is available commercially. The selected design is constructed and its performance measured.
AFRIKAANSE OPSOMMING: Die suksesvolle werking van ʼn mobiele VHF "jammer‟ benodig ʼn kompakte antenna met ʼn bruikbare benuttingsgraad wat oor ʼn wyeband funksioneer. Die ontwerp van so ʼn antenna is die fokus van hierdie tesis. Die antenna moet kompak genoeg wees om draagbaar te wees en moet ʼn bruikbare benuttingsgraad hê oor ʼn frekwensie-bandwydte van meer as 10:1. ʼn Praktiese spesifikasie is opgestel vir die antenna deur te kyk na die sigblaaie van beskikbare stelsels. “Volgolf” elektromagnetiese modelleringsagteware is daarna gebruik om ʼn parametriese ondersoek te loods van verskillende antennas. Verskillende topologieë is getoets met ʼn verskeidenheid van belaaide seksies waar die topologieë ge-optimaliseer was vir wins en weerkaatskoëffisiënt. Die resultate vir elke optimale oplossing is vergelyk.Opgrond van hierdie resultate is bevind dat die beste topologie die tradisionele monopoolmas "whip-type‟ antenna is met vier RL lading afdelings langs die lengte versprei. Analise word gebruik om te wys dat verwag kan word dat dit aan die aanwins en staande golf verhouding (SGV) spesifikasies sal voldoen met n 10 dB verhoging in aanwins vir n laer SGV. Die geselekteerde ontwerp is gebou en gemeet om te verifieer dat dit aan die spesifikasies voldoen.
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Morsy, Mohamed Mostafa. "DESIGN AND IMPLEMENTATION OF MICROSTRIP MONOPOLE AND DIELECTRIC RESONATOR ANTENNAS FOR ULTRA WIDEBAND APPLICATIONS." OpenSIUC, 2010. https://opensiuc.lib.siu.edu/dissertations/169.
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Ultra wide-band (UWB) technology is considered one of the very promising wireless technologies in the new millennium. This increases the demand on designing UWB antennas that meet the requirements of different UWB systems. In this dissertation, different UWB antennas are proposed such as an antenna that covers almost the entire UWB bandwidth, 3.5-11 GHz, as defined by the federal communication commission (FCC). This antenna has a size of 50×40×1.5mm3. Miniaturized worldwide UWB antennas are also introduced. Miniaturized worldwide UWB antennas that have compact sizes of (30×20×1.5) mm3, and (15×15×1.5) mm3 are also investigated. The designed worldwide UWB antennas cover the UWB spectrums defined by the electronic communication committee (ECC), 6-8.5 GHz, and the common worldwide UWB spectrum, 7.4-9 GHz. A system consisting of two identical antennas (transmitter and receiver) is built in the Antennas and Propagation Lab at Southern Illinois University Carbondale (SIUC) to test the coupling properties between every two identical antennas. The performance of that system is analyzed under different ii conditions to guarantee that the transmitted signal will be correctly recovered at the receiver end. The designed UWB antennas can be used in many short range applications such as wireless USB. Wireless USB is used in PCs, printers, scanners, laptops, MP3 players, hard disks and flash drives. A new technique is introduced to widen the impedance bandwidth of dielectric resonator antennas (DRAs). DRA features compactness, low losses, and wideband antennas. Different compact UWB DRAs are investigated in this dissertation. The designed DRAs cover a wide range of frequency bands such as, 6.17-24GHz, 4.23-13.51GHz, and 4.5-13.6GHz. The designed DRAs have compact sizes of 1×1×1.5cm3, 0.9×0.9×1.32cm3, 0.6×0.6×1cm3, and 0.6×0.6×0.9cm3; and cover the following frequency bands 4.22-13.51GHz, 4.5-13.6GHz, 6.1-23.75GHz, and 6.68-26.7GHz; respectively. The proposed DRAs may be used for applications in the X, Ku and K bands such as military radars and unmanned airborne vehicles (UAV).
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Jedlicka, R. P., and J. M. Williamson. "Monopatch Antenna for Balloon Telemetry Applications." International Foundation for Telemetering, 1992. http://hdl.handle.net/10150/611958.
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International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, CaliforniaA new antenna design, which is particularly suited for balloon telemetry applications, is presented. In the past, simple monopoles have been utilized as transmit antennas on balloon payloads. The monopole radiation pattern has an inherent null along its axis. This causes an undesirable loss of signal when the balloon is directly overhead. To prevent this occurrence, a microstrip antenna patch was incorporated into the monopole design. This combination, a "monopatch" antenna, provides sufficient coverage even when the balloon is directly over the ground station. The monopatch has been successfully flown on high altitude balloon flights.
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Hurley, Robert C. "Computation of monopole antenna currents using cylindrical harmonic expansions." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/22966.
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Approved for public release; distribution is unlimitedThis thesis investigates the viability of a new method for numerically computing the input impedance and the currents on simple antenna structures. This technique considers the antenna between two ground planes and uses multiregion cylindrical harmonic expansions with tangential field continuity to obtain the surface currents and input impedance. The computed results are compared to the results obtained from the Numerical Electromagnetics Code for various physical parameters to assess computational accuracy.
http://archive.org/details/computationofmon00hurl
Lieutenant, United States Navy
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Lima, Larissa Cristiane Paiva de Sousa. "Design and experimental characterization of a metamaterial-assisted monopole antenna." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18155/tde-12112014-080528/.
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In recent years a new class of materials, the metamaterials, has emerged in the scientific community. The use of these materials makes possible to achieve unique electromagnetic properties, such as the negative refractive index. Today there exist several applications that take advantage of these special properties, such as sensors, antennas and invisibility cloaks, aiming at improving their intrinsic characteristics. Based on these considerations, this project aims at developing metamaterials structures to control the radiation properties of antennas in the microwave range, such as gain and directivity. More specifically, it was also chosen chiral metamaterials, mainly due to the phenomenon of electromagnetic field rotation which opens the possibility to control efficiently the radiation properties of antennas. In addition, chiral metamaterials, which have proved to be a more attractive alternative to obtain negative or zero refractive index, enable a greater degree of freedom in the design of different structures. This work encompasses all different phases of the structure design, namely: project, computational modeling, fabrication, and characterization of the proposed structures. We show improvements for the gain that in some cases reaches more than the double of the conventional monopole antenna gain and for the return loss parameter, which reaches minimum values. We also could maintain good efficiency and improve the input impedance matching. Finally, it is worth mentioning that this new technology also has the great potential to be applied in the telecommunication devices, particularly to improve communications based on antennas.Nos últimos anos uma nova classe de materiais, os metamateriais, emergiu na comunidade científica. O uso desses materiais torna possível alcançar propriedades eletromagnéticas singulares, como o índice de refração negativo. Hoje existem vastas aplicações que usufruem destas propriedades especiais, como os sensores, mantas de invisibilidade e antenas, onde se procura o aperfeiçoamento de suas características intrínsecas. Com base nestas considerações, este projeto buscou desenvolver estruturas metamateriais para controle das propriedades de radiação de antenas na faixa de micro-ondas, tais como diretividade e ganho. Mais especificamente, foram utilizados os metamateriais quirais, principalmente devido ao fenômeno de rotação do campo eletromagnético que abre a possibilidade de controle mais eficiente das propriedades de radiação de antenas. Além disso, os metamateriais quirais, por se mostrarem uma alternativa mais atraente para se obter meios com índice de refração zero ou negativo, possibilitam um maior grau de liberdade no projeto de diferentes estruturas. Este trabalho contempla, ainda, todas as etapas de projeto de tais estruturas, quais sejam: projeto, modelagem computacional, fabricação, e caracterização das estruturas. Mostramos melhorias para o ganho que, em alguns casos, chega a mais do que o dobro do ganho da antena monopolo convencional e para o parâmetro de perda de retorno, que atinge valores mínimos. Nós também mantivemos uma boa eficiência e melhoramos o casamento de impedância de entrada. Finalmente, vale salientar que essa nova tecnologia também apresenta grande potencial de ser aplicada em dispositivos de telecomunicações, com o intuito de aprimorar a comunicação baseada em antenas.
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Hussain, Asif Jamshaid. "Design of an Ultra Wideband (UWB) Circular Disc Monopole Antenna." Thesis, Linnéuniversitetet, Institutionen för datavetenskap, fysik och matematik, DFM, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-34605.
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My task was to design a circular disc monopole antenna in the Ultrawideband range i.e. 3.1 - 10.6 GHz using the ADS (Advanced Design System) package. In order to achieve the desired matching I simulated dierent sizes of the radiator, feed line and the ground plane of the antenna and observed the current flow in a circular monopole at different frequencies. I did some miniaturization (circular shape and chopping) of the antenna and observed the current flow and radiation pattern in 2D and 3D.
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Christman, Alan M. "Validation of NEC-3 (Numerical Electromagnetics Code) with applications to MF and HF antenna technology." Ohio : Ohio University, 1990. http://www.ohiolink.edu/etd/view.cgi?ohiou1172605318.
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Siao, Sin-long, and 蕭新朧. "Miniaturized GPS chip antenna and multiband monopole antenna." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/09486805850704632333.
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碩士國立臺灣科技大學
電機工程系
97
For future communication systems, to simultaneously meet various requirements such as low profile, compact size, light weight and easy fabrication, the dimension consideration of antenna design is a very critical part. The radiation performance of the antenna also directly affects the received signal and communication quality. Therefore this thesis proposes a miniature GPS antenna to be built in the mobile phone, PDA and smart phone for obtaining the satellite signals. A commercial EM solver, HFSS has been utilized to design prototype and investigate the performance variation for antenna located at different positions in the test board. Moreover, a multi-band monopole antenna is also presented to integrate more wireless access functions. The operating band of the proposed antenna is composed of GSM, DCS, PCS, UMTS, Bluetooth, WLAN、WiMax, Hyper LAN, WWAN and WiFi. As to achieve a better radiation performance, the antenna also employs two back-strips to enhance more resonant frequencies and flexibly adjust input impedance in this study.
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蔡文益. "Broadband Fractal Circular-Monopole Antenna." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/ejrb2e.
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碩士景文科技大學
電腦與通訊研究所
99
In this paper, a novel broadband Fractal circular-monopole antenna is presented. This antenna consists of printed circular iteration with two iterating level and ground-plane with radius 25mm, making it easy to making it easy to combine directional, high gain and wide bandwidth. A prototype is designed to operate at 1.5GHz-5.86GHz, the measured 10 dB bandwidth is nearly 1:2 at the center frequency of 3.775GHz. Experimental results are shown to verify the validity of theoretical work. Fractal monopole antenna is formed with hollow of circle, which featuring of minification, multi-frequency bands and wide bands. The planar fractal monopole antenna is based on the Sierpinski carpet concept and to modified, the Sierpinski fractal has generated two iterations, use the decomposition algorithm by circular, and compare these with integrators and initiator type. Firstly, base on generally circular disc to generate hollow of circular, this initiator has a circumference of and 1mm trace width. In the decomposition algorithm, a geometric ratio of circle is taken and joining the midpoints of union of the circles central, reduce the circle to 1/3 diameter and canonical Sierpinski carpet algorithm to fill the circle with twice mathematics equals 1/9 diameter by 2nd iteration.The geometrical structure and dimensions of the proposed monopole type antenna is printed on FR4 substrate and is simulated by using FEM based electromagnetic simulator, Ansoft HFSS. All of them describe a multiband behavior of fractal antenna. This behavior is consistent from the input return loss and gain; moreover radiation patterns planes of view. The same scale factor existing among similar structures in the fractal circular-shape. It can be summarized that the self-similarity properties of the fractal structure are translated into its electromagnetic behavior. The current density distributions have a similar and vary in complicated among bands as well. Such distributions allows flexibility in matching multi- and width band operations in which a larger frequency required, such as FemtoCell and UMTS base station application including LTE, UMTS, GPS L1, WIFI, and WiMax. The circular monopole type is based on fractal structure and refers to the Sierpinski gasket self-similarity algorithm, a prototype of the design is successfully implemented with close agreement between measurement and simulation. The fractal geometry and overall size can be effectively utilized ID or Logo surface for integrating with other components in IT products.
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CHEN, GUAN-LIN, and 陳冠霖. "Circularly Polarized Monopole Antenna Designs." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/80716486991789568103.
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碩士逢甲大學
電機工程學系
105
This paper studied the circularly polarized RFID reader antenna. The first antenna is a compact circularly polarized monopole antenna. It is fed by a microstrip line. By adjusting the parameters of the left branch and right branch, a circularly polarization with good impedance matching can be obtained. The overall dimension of the first proposed antenna is 60×60×0.8 mm3. The measured 10-dB return loss bandwidth of the antenna is 93.4 MHz (901 – 993.4 MHz, 9.3%), 3-dB axial ratio bandwidth is 12 MHz (916 – 928 MHz, 1.3%), the maximum gain and radiation efficiency are -1.1 dBic and 70%, and antenna has bidirectional radiation characteristics. The half-power beamwidths antenna in XZ plane and YZ plane are 170 degrees and 115 degrees respectively. The first proposed antenna is a low profile, compact size, low cost antenna, which is suitable for portable UHF RFID reader application. The second proposed antenna uses AMC reflector to enhance the gain of the antenna. The AMC reflector periodic structure is placed 9 mm away from the bottom of the antenna for the optimal configuration. The measured 10-dB return loss bandwidth is 650 MHz (2.08 – 2.73 GHz, 27%), 3-dB axial ratio bandwidth is about 120 MHz (2.6 – 2.72 GHz, 4.5 %); the best axis ratio is 1.29 (2.65 GHz), and the measured gain is 6.5 dBic. The front-to-ratios in XZ plane and YZ plane are both about 22 dB. The overall dimension of the second antenna is 80×80×12.2 mm3.
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Huang, Hao-Shiang, and 黃晧翔. "Circularly Polarized Monopole Antenna Designs." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/07486773061579913898.
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碩士國立高雄海洋科技大學
電訊工程研究所
102
In this dissertation, circularly polarized (CP) monopole antenna designs for industrial, scientific and medical (ISM) band are proposed. First, by properly introducing dual strip-sleeves shorting at the ground plane, the antenna design provides the impedance bandwidths (RL≧10 dB) of 270 / 988 MHz and the 3 dB axial-ratio (AR) bandwidth of about 85/710 MHz for 2.4/5.2 GHz wireless local area network (WLAN) applications, respectively. The proposed planar antenna reduces the antenna size by at least 22% since the overall antenna size is only 40 × 40 × 1.6 mm3. Meanwhile, the measured peak gains and antenna efficiencies are about 4.2/3.2 dBic and 95/90% across the operating bands, respectively. Next, two spiral monopole antennas with radial and axial circular polarization, respectively, are proposed with the impedance bandwidth of 135/218 MHz and the 3 dB axial-ratio (AR) bandwidth of about 108/125 MHz across 2.45 GHz operating band. Furthermore, the measured peak gains and antenna efficiencies are about 9/10 dBic and 85/80%, respectively. Finally, the analysis of the body specific absorption rate (SAR) for two proposed spiral monopole antennas are discussed and less than 1.6W/kg for 1-g body tissue.
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Wang, wei-ming, and 汪偉銘. "Compact Dipole Antenna and Multi-band Monopole Antenna Applications." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/20665209134079983350.
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碩士明志科技大學
電機工程研究所
100
The three compact structure of dual-band and multi-band operation antennas are proposed in this paper. The resonant path are based on resonating at a quarter and a half wavelengths. By using branch loop and coupling resonant, it can satisfy achieve the required band. Firstly, a dipole antenna suitable for Bluetooth, WLAN and WiMAX applications is proposed. The antenna is composed of two pairs of T-shaped and U-shaped sections, can achieve a compact size of 6(W)*35(L)mm2 FR4 substructure, With 10 dB return loss, two operating frequency bands covering 2.4-2.55 and 4.99-6 GHz can be obtained with our design. Second, a monopole antenna suitable for GSM/DCS/PCS/UMTS applications is proposed. The antenna is composed of the loop and the coupling resonance, can achieve a compact size of 15(W)*50(L)mm2 FR4 substructure, With 6 dB return loss, two operating frequency bands covering 0.86-0.96 and 1.71–2.17 GHz can be obtained with our design. Third, a folded loop antenna suitable for GSM/DCS/PCS/UMTS applications is proposed. The antenna by the resonance loop composed, can achieve a compact size of 20(W)*50(L)mm2 on copper substructure, With 6 dB return loss, two operating frequency bands covering 0.86-0.96 and 1.71–2.17 GHz can be obtained with our design.
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Chien, Wu-cheng, and 簡武正. "BROADBAND MONOPOLE ANTENNA FOR DVB-T." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/54365269513755483306.
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碩士大同大學
通訊工程研究所
99
In the thesis, a wideband monopole antenna for the European DVB-T (Digital Video Broadcast-Terrestrial) system specification is proposed. This paper uses the theory of traditional monopole antenna and impedance matching with the appropriate adjustment method to meet the DVB-T frequency band specification(470 MHz to 862 MHz), the monopole antenna in order to meet the DVB-T specification, firstly, adjusted the length and width of antenna to meet the low-frequency part of the DVB-T, followed by a patch with inset feeding configuration is used and adjust the feed line to the appropriate width ratio, and effective enough to increase the impedance bandwidth to cover the DVB-T requirements specification band. After actual results of the measurement of the impedance bandwidth and radiation characteristics are consistent with the simulation, the proposed antenna can be applied to DVB-T.
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Lin, Yen-Chih, and 林彥鋕. "CPW-Fed Circularly Polarized Monopole Antenna." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/36587086447920777634.
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碩士逢甲大學
產業研發碩士班
95
In this thesis, a CPW-fed circularly polarized monopole antenna has been implemented and investigated. The simulated and measured results of the antennas are detailed and analyzed. First, a new antenna possessing linear polarization and circular polarization for applications of the global positioning system (GPS) and digital communication system (DCS) has been designed. The proposed antenna consists of two parts: a quasi-C-shaped monopole antenna and an inverted L-shaped strip connecting to ground plane. By introducing a gap between the monopole antenna and inverted L-shaped strip, a traveling-wave current is excited on a loop trace. Meanwhile, by utilizing the electromagnetic coupling effect inside the gap, the vertical and horizontal electric fields with the phase difference of 90 degree and the equal magnitude result in the circularly polarized radiation in the free space at the 1.5 GHz band (GPS). The resonant band at 1.8 GHz (DCS band) is determined by the effective length of the quasi-C-shaped monopole antenna. Finally, the optimal dimensional values of the antenna are derived by tuning the critical parameters in order to obtain the maximum bandwidth and desired circular polarization。 The advantages of the new proposed antenna are miniaturization, dual-system operation, circular polarization and easy fabrication. The proposed antenna can be a candidate of the RX/TX radiator for the integration of GPS and DCS systems.
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WANG, JIAN-CHENG, and 王健丞. "CPW Monopole Antenna Application Circular Polorization." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/26wa3a.
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碩士大葉大學
電機工程學系
104
This paper presents to the CPW fed monopole antenna can be use in global positioning system(GPS)and 4G(LTE).This antenna thourgh suitable cutting one side of a metal ground plane, so that the original monopole resonance disappears, forming a dipole resonance, and output and has two orthogonal linearly polarization 90° to achieve circular polarization. On the other side of the metal ground plane, with inverted L-shaped metal patch antenna bandwidth is increased so that the coating on the 4G(LTE)band.In addition, the antenna design can be simple,low -cost production, and easy to combine with the microwave components.
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Chang, Teng-Yuan, and 張燈元. "Dual Broadband Bow-Tie Monopole Antenna." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/26574087388647171013.
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碩士國立澎湖科技大學
電資研究所
102
This paper presents the designs of three dual broadband bow-tie monopole antennas. The frequencies are designed to meet the applications of the four bands GSM/WLAN/WiMAX/LTE. That is, the low-frequency and high-frequency bands cover 1.71~2.69 GHz (44.55%) and 5.18~5.825 GHz (11.72 %) individually, with input reflection coefficient -10dB level. The first antenna is formed by a bow-tie monopole antenna and a rectangular ring antenna, which is named ringed dual broadband bow-tie antenna. The second antenna is named half-wavelength slot dual broadband bow-tie antenna, which is a broadband bow-tie antenna embedded a half-wavelength slot to generate dual broadband. The third antenna is named quarter wavelength slot dual broadband bow-tie antenna, which is embedded with two open-end quarter-wavelength slots. Using the above mentioned three different methods to design dual broadband monopole antenna, simulated frequency bands are all up to 30% bandwidth. Ring dual broadband bow-tie antenna is implemented and measured. The low-frequency band is 2.19~3.06 GHz (33.14%) and the high-frequency band is 5.3~6.45 GHz (19.57%). The measured results of this half-wavelength slot dual broadband bow-tie antenna are the low-frequency band 1.95~2.65 GHz (30.43%) and the high-frequency band 4.79~6.8 GHz (34.69%). The last 1/4 wavelength slot dual broadband bow-tie antenna with the largest bandwidth can cover GSM/WLAN/WiMAX/LTE band, which the experimental measurements are included the low-frequency band 1.66~2.73 GHz (48.75%) and the high frequency band 4.89~7.00 GHz (35.49%). In addition, as measured results, the S11 and radiation pattern of the designed antenna are roughly consistent with the numerical simulation to verify the feasibility of the antenna design methods mentioned in this paper.
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LEE, Kuo-ching, and 李國清. "Planar Triple-band Monopole Antenna Design." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/83782110877053611411.
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碩士國立臺灣科技大學
電子工程系
96
The aim of this thesis is to design the triple-bands mono-pole antenna, which was made by common material named FR4 board purchased from the market. Literature survey studied from dual-bands and triple-bands’ papers and these as the fundamental structure; the implementation performed by electromagnetic analysis program named IE3D to do fine tuning antenna and come out simulation results. The optimized parameters had been resolved for making actual antenna product. The proposed planar mono-pole antenna has excellent function upon WiMAX and WLAN frequency bands (2500-2690/3400-3690/ 5250-5850 MHz for WiMAX) and (2.4-2.484 GHz and 5.15-5.35 GHz、5.725-5.825 GHz for WLAN); This antenna also could support frequency bands for PCS(1.85 ~ 1.99 GHz) and UMTS (1.92 ~ 2.17 GHz) with acceptable performances. It should be a good product applying to industrial enterprise.
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See, Chan H., Hmeda I. Hraga, Raed A. Abd-Alhameed, Neil J. McEwan, James M. Noras, and Peter S. Excell. "A Low-Profile Ultra-Wideband Modified Planar Inverted-F Antenna." 2013. http://hdl.handle.net/10454/9727.
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NoA miniaturized modified planar inverted-F antenna (PIFA) is presented and experimentally studied. This antenna consists of a planar rectangular monopole top-loaded with a rectangular patch attached to two rectangular plates, one shorted to the ground and the other suspended, both placed at the optimum distance on each side of the planar monopole. The fabricated antenna prototype had a measured impedance bandwidth of 125%, covering 3 to 13GHz for reflection coefficient better than -10 dB. The radiator size was 20 x 10 x 7.5 mm(3), making it electrically small over most of the band and suitable for incorporation in mobile devices. The radiation patterns and gains of this antenna have been cross-validated numerically and experimentally and confirm that this antenna has adequate characteristics for short range ultra-wideband wireless applications.
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Tsai, Ming-Li, and 蔡明利. "Study of Monopole Antenna and Chip Antenna for Wireless Communication." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/80574470213960999487.
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碩士國立臺灣科技大學
電子工程系
96
In this thesis, we will design planar antenna and semiconductor chip antenna, of the wireless communication. We discuss planar antenna implemented by directly printing conducting metal on the substrate (FR4) to have the advantages of compact size, manufacturing convenience, reduction of cost, and easy combination to other circuits. We adopt the whole simulation software IE3D simulate the properties of antenna, and realize antenna with RF-4 board again in this text, use network analysis and chamber to examine the S-parameter and patterns of antenna. We probe into the design of the semiconductor chip antenna in chapter four, and apply chip antenna with inductance value to a replace the inductor in traditional voltage-controlled oscillator.
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Liang, Yi-chung, and 梁議中. "Ultra-broadband CPW-fed circular monopole antenna." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/67601833182890315268.
Full textAbstract:
碩士國立中央大學
電機工程研究所
95
A ultra-broadband, planar, circular monopole antenna (PCMA) fed by coplanar waveguide (CPW) structures is demonstrated. The CPW configuration permits easy integration with the uniplanar monolithic integrated circuits/monolithic microwave integrated circuits. Two modifications on the CPW ground plane are applied to improve the impedance bandwidth and radiation characteristics of the CPW-fed PCMA. First, the edges around the circular monopole are tapered to drastically increase the impedance bandwidth. Plus, the antenna gain is increased at the lower frequencies of the band. Second, the tapered edges are corrugated with rectangular gratings to significantly improve the radiation patterns, particularly at the frequencies around the higher band edge. The demonstrated CPW-fed PCMA features an over 151% VSWR=2 fractional bandwidth and satisfactory radiation characteristics over the whole band.
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Wu, Cheng-Hsun, and 吳政勳. "UWB Monopole Antenna Having Band-Notched Frequency." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/91331865541039601311.
Full textAbstract:
碩士義守大學
電子工程學系碩士班
95
In this thesis, three kinds of ultra wideband (UWB) monopole antennas having band-notched frequency were proposed. First, a printed circular disc monopole antenna with a half ring slot having frequency band-notch characteristic was presented. By etching a slot in the UWB monopole antenna, a notch frequency can be operated. The etched slot can control the notch frequency and bandwidth of the antenna. Second, a printed monopole antenna fed by coplanar waveguide loading split-ring resonators (SRRs) was proposed. SRR loaded CPW structure can achieve a stopband. Notch frequency and attenuation can be controlled by tuning the size and stages of SRR. Finally, we present a printed monopole antenna fed by microstrip lines loading complementary split-ring resonators (CSRRs). For improving attenuation of notch frequency, it can be seen that the performance at high frequency band is improved with the extra patches. Moreover, CSRR stages are decreased with extra patches.
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Chen, Pei-Wen, and 陳姵妏. "A V-Shaped Circularly Polarized Monopole Antenna." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/91914493608976082208.
Full textAbstract:
碩士大同大學
通訊工程研究所
100
This thesis presents a broadband circularly polarized antenna. The antenna is a V-shaped monopole fed by a microstrip line. The V-shaped design is modified from a reference antenna which contains a vertical and a horizontal arm fed by a microstrip line. By tuning the angle between the two arms, a critical angle yielding a broadband circularly polarized wave can be found. To improve the overlapped return-loss and axial-ratio bandwidth, a slit is cut on the ground plane. It is measured that the return-loss bandwidth is 23% and the axial-ratio bandwidth is 30%.
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Xin, Ming-Quan, and 辛明泉. "Omnidriectional Multi-band Low-profile Monopole Antenna." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/32746854466881735539.
Full textAbstract:
碩士正修科技大學
電子工程研究所
95
In this thesis, a series of low-profile monopole antennas with multi-band operation is addressed. The proposed antennas are suitable for applications in mobile phones for GSM (Global System for Mobile communication, 890-960 MHz), DCS (Digital Communication System, 1710-1880 MHz), and PCS (Personal Communication System, 1850-1990 MHz) multi-band operations. The low-profile structure of the antenna miniaturizes its size that can be embed the antenna into the mobile equipment. Moreover, the present antenna has the omnidriectional radiation pattern and can be adjusting the branch path to modulate its operation band that satisfies the smart requirements of a modern mobile communication product.
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CHIU, PEI-YUAN, and 邱培源. "Printed monopole antenna designs for WLAN applications." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/81988507648488590921.
Full textAbstract:
碩士國立高雄師範大學
物理學系
94
In this thesis, printed monopole antenna designs for the purpose of wider impedance bandwidths which can cover the 2.4/5.2/5.8 GHz triple-band WLAN operations are presented. Firstly, two innovative printed monopole antenna designs of different shape are proposed in Chapter 2 and 3, both designs have two different resonant paths for controlling the lower and upper resonances easily. Secondly, the printed monopole antenna design with one resonant path, and folded by a shorting pin is studied in Chapter 4. Simply by adding the parasitic element, as well as the generating of electromagnetic coupling between the resonant paths, all designs above-mentioned can easily achieve the WLAN 2.4/5.2/5.8 GHz triple-band operations.
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Chung, Wen-Tsan, and 鐘文燦. "Design of Monopole Antenna for UWB Application." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/87643305311038735814.
Full textAbstract:
碩士國立彰化師範大學
電子工程學系
97
In this thesis, ultra-wideband (UWB) antenna design using microstrip-fed were studied. Three different UWB antenna structures were designed, implemented, and investigated. The first antenna studied is an octagonal-shaped ultra-wideband printed antenna. Its UWB operation within the required 3.1–10.6 GHz frequency range is achieved by simply embedding a small rectangular slit in the ground plane under the feed line of the octagonal patch. With the dimensions (length and height) of the slit carefully tuned, the vital information on how the various parameters affect the impedance matching is provided. The second proposed antenna is the follow-up design of the first proposed one, where the band-notch function is achieved by embedding two additional symmetrical L-shaped slits at both sides of the ground plane. The gain and time-domain characteristics of this antenna show that it is applicable to any wireless communication system that requires a stable signal transmission in the 5-GHz notch-band excluded UWB. Finally, a compact microstrip-fed monopole antenna for application in the WLAN (2.4-2.484 GHz) and UWB bands is designed and investigated. The radiating element of the proposed antenna consists of two arms which resonate at the fundamental frequencies of 2.45 and 3.5 GHz, respectively. A narrow slot is purposely embedded in the ground plane under the microstrip feed line to improve the impedance matching for the higher-order modes of the two radiating arms for achieving an ultra-wideband response. A prototype of the designed antenna is fabricated and measured, and satisfactory radiation properties were observed.
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Pan, Po-Yu, and 潘柏宇. "Study of Multiband Monopole Antenna for LTE." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/3jrg8n.
Full textAbstract:
碩士義守大學
電機工程學系
102
Antenna device needs to be able to send and receive signals in wireless network communications. As technology advances, Mobile band from the early GSM 900/1800 (2G) and now widely used cellphone multimedia transmission UMTS 2100 (3G) and is developing LTE 700/900/1800/2600 (4G). This paper presents the multiband antennas applicable for LTE, this antenna have three- frequency band, the main design principles combined with G-type monopole antenna and L-type monopole antenna, with two different shapes monopole excitation frequency to complete. First, use of G-type monopole antenna structure resonance of 700MHz/1800MHz modal, then by adding L-shaped monopole antenna structure to increase the resonance path length, in addition to produce 2600MHz modal. The design frequency bands are for LTE 700/1800/2600. The simulator HFSS is employed for simulation and results show that 700/1800/2600MHz are included in the band.
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Cheng, Yu-Wei, and 程昱瑋. "Design of the CPW-fed Monopole Antenna." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/y98488.
Full textAbstract:
碩士國立臺南大學
電機工程學系碩博士班
103
A novel coplanar-waveguide (CPW)-fed monopole antenna with dual-band circular polarization (CP) has been demonstrated in this work. A simple two-finger fork-like strip monopole, which is fed at the CPW feeding line, is designed to resonate at the 1.57 GHz; in addition, the resonant mode also excites a right-hand circularly polarized (RHCP) wave for applications of the global positioning system (GPS). A rectangular patch is added at the end of one finger to generate a horizontal current component, thus enhancing the CP performance. A left-hand circularly polarized (LHCP) wave at 2.33 GHz for the satellite digital audio radio (SDAR) service system is excited by modifying the geometry of the ground plane. To improve the CP performance at the SDAR band, a short stub is added at the left side of the ground plane. Only two resonances are merged and then a moderate impedance bandwidth is obtained. The measured impedance bandwidth of a reflection coefficient (S11) < -10 dB ranges from 1.49 to 2.92 GHz, and thus covers most of the commercial wireless communication systems. The 3-dB axial ratio (AR) bandwidths are about 40 MHz at the lower band (1.57 GHz) and 290 MHz at the upper band (2.33 GHz).
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Yeh, Li-Yu, and 葉秝妤. "Design of Monopole Antenna for Mobile Communications." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/41537682962713408448.
Full textAbstract:
碩士南台科技大學
通訊工程研究所
99
Recently, the mobile phone has become a requirement of life. The mobile phone is not already only a communication tool, but also it combines lots of other applications. As the demands for covering bands are increasing, however, designing of antenna is intending toward to small size and compact with multi-band operation. Instead of the traditional exposed antenna, the internal antenna is the current trend since it can place at inner of a handset. For miniaturization of current handsets, internal antenna is easier than exposed antenna. In this thesis, we present two novel antenna designs for mobile phone use. Due to miniature and multifunction requirements of mobile product, we select a monopole antenna as the feed way at first. The antenna can cover GSM900/PCS/DCS/UMTS operation in chapter 2, The printed antenna has been popular for various applications due to low cost and easy to fabrication, low profile and compatible with integrated circuit. However, the WLAN device has become more and more popular for mobile application. For the requirement, we present a monopole antenna design with penta-band operation in chapter 3. Besides, increasing the radiation efficiency, radiation pattern and gain of the miniaturized antenna are discussed in this thesis.
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Jian, Jhin-Heng, and 簡智亨. "Designs of 2.4-GHz Monopole Antenna Array." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/54217402149683629278.
Full textAbstract:
碩士樹德科技大學
電腦與通訊系碩士班
104
In this study we propose two antenna-array designs, four monopole radiators, with high gain for 2.4-GHz WLAN applications. The first one is with a simple structure, and uses multiple microstrip-line branches to feed the four radiators. The microstrip-line branches is with equal amplitude and in phase or equal phase shifting, that is, each barnching point is like a equal power divider and lengths of microstrip line will be conditionally tuned. By changing the length combination of the microstrip-line branches for shifting the signals’ phase, the radiation pattern and antenna gain of this antenna array can be adjusted. From the experimental result we can find that the radiation of the proposed antenna really can be adjusted and a good antenna gain of about 4.3 to 9 dBi is also demonstrated. In the second antenna array design, a 2.4-GHz WLAN array antenna is implemented by using a 4 by 4 Butler matrix and the four monopole radiators. The 4 by 4 Butler maxtrix has four input ports for connecting source signal and four ouput ports for driving the four monpole radiators. Each input-port signal through the Butler matrix will be seperated into four output signals, with different combination of phase shifting, to drive the monopole radiators and generate a different type of radiation pattern. Therefore, by choosing different input port, a diversity of radiation pattern for the proposed antenna array will be achieved. Besides, size effect of ground plane is also be discussed.
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TSENG, BO-FEI, and 曾泊斐. "Analysis of Planer Circular Polarization Monopole Antenna." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/tsvysu.
Full textAbstract:
碩士大葉大學
電機工程學系
105
In this research, Different circularly polarized structures are studied on monopole antennas. The circular polarization characteristics are generated by different structures. The first antenna produces a wideband circular polarization characteristic using an offset feed current. The second antenna produces dual-band circular polarization characteristics by an orthogonal structure coupled to the diamond - shaped ground plane. The third antenna produces dual-band circular polarization characteristics using an asymmetric ground plane and a special structure. Frequency bands in this study include WLAN, WiMAX, LTE, etc. The operable frequency band is based on a reflection coefficient below -10 dB and an axis ratio below 3 dB.
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Luo, Shih-Cing, and 羅仕清. "Study of Broadband Monopole Slot Antenna Feed." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/03680026198637219053.
Full textAbstract:
碩士明新科技大學
電機工程系碩士班
104
In this thesis, we study separately the asymmetric coplanar waveguide fed and the U-shaped coplanar waveguide fed monopole slot antennas. The Implement of antenna is carried out with printing circuit boards, which are easy to be integrated, low cost and enhancing convenience production characteristics. In this study, two different locations of feed are applied for the monopole slot antenna. The resonant modes of the antenna are excited by different current paths. In asymmetric coplanar waveguide feed case, by changing the location and shape of the feed, the asymmetric coplanar waveguide fed monopole slot antenna has operating frequency from 2.55GHz to 6.2GHz with operating bandwidth 85%. The U-shaped coplanar waveguide fed monopole slot antenna has operating frequency between 2.3GHz and 5.4GHz with bandwidth is 82%. The operating bands of these antennas are including Bluetooth ,WLAN and WI-MAX, which can be applied for wireless network. The bandwidth is more than 25% (500MHz above) and fits in the definition of ultra wide band.
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LU, BO-RU, and 盧柏儒. "Broadband C-Shaped Circularly Polarized Monopole Antenna." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/87950526255852096732.
Full textAbstract:
碩士大葉大學
電機工程學系
104
This thesis discusses is designed and improve the Broadband C-Shaped monopole. The antenna is reference by C-Shaped, and add a rectangle and open-loop in ground plan to achieve width bandwidth and axial ratio. Advantages of the antenna are simple structure, compact size , width bandwidth and axial ratio. Objective to cover the WLAN 5 GHz (4.915 - 5.825 GHz) bandwidth.
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Liu, Ching-Wen, and 劉景文. "Low-profile planar ring-shaped monopole antenna." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/45584013235079201303.
Full textAbstract:
碩士國防大學中正理工學院
電子工程研究所
91
In this thesis, several designs of low-profile monopole antennas with omni-directional patterns, multiple operating bands for some special standards or specifications, and a reduced antenna height are presented. The proposed antennas with a largely lowered antenna height are basically constructed by a metallic strip composed of a straight-line section and a ring-shaped section with a tail-slit of 0.5 mm width. Dual-band or tri-band planar monopole antennas are achieved by adding one or two ring-shaped metallic strip(s) with a tail-slit in the inner space of a metallic strip with the same shape and different radii. The total length of each metallic strip, associated with the quarter wavelength of a resonant frequency excited by the metallic strip, can be calculated in the beginning of antenna design process. And, by embedding a suitably selected chip resistor at an appropriate place among ring-shaped metallic strips or adding a properly designed outer arc-shaped metallic strip, impedance matching and bandwidth enhancement of some band mismatched when the chip resistor or the outer arc-shaped metallic strip is absent can be simultaneously obtained. Thus, novel antenna designs for multi-band operation, which are the combinations between GSM and DCS, PCS bands or that between ISM and UNII bands, can be easily implemented.
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Ke, Zhi Wen, and 柯智文. "Design of monopole antenna for wireless LAN." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/13579530183771793649.
Full text
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Huang, Chien-Rung, and 黃建榮. "Compact leaky-wave antenna and dual-band circularly polarized slotted monopole antenna." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/91288063850864701112.
Full textAbstract:
碩士國立交通大學
電信工程研究所
100
This thesis consists of two parts：1. Using split ring resonators to suppress the side-lobe level of the tapered compact leaky wave antenna. And 2. Using the structures of slots to excite dual-band circularly polarization in monopole antenna. In the first part, we demonstrate two types of suppressing the reflection wave of the leaky wave antenna. The first structure is to put the split ring resonators at the open end of the leaky wave antenna, and the split ring resonators can generate stop-band to suppress the side-lobe level efficiently. The second structure is to etch the split ring resonators in the ground plane, and the reflected wave will couple to the split ring resonators and be trapped. Thus it can be seen that we can use split ring resonators not only to suppress the side-lobe but also to reduce the length of the leaky wave antenna. In the second part, a dual-band circularly polarized monopole antenna using structures of slots will be introduced. The main structure of the monopole antenna is a circular strip and we add a circular patch at the end of the strip. In the ground plane, we etch a L-shaped slot, and this slot play an important role of exciting the circular polarization not only at the lower band but also at the upper band. The most important is that we can choose the different length of the L-shaped slot to operate on the frequency band what we want. On the other hand, we also add two notches at the antenna, and these two notches can adjust the operating frequency band of circular polarization at the upper band. From the above, we can use these simple structures to get circular polarizations.
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Li, Chung-Huan, and 李仲桓. "Study of the microstrip-fed printed monopole antenna." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/73927389480336454152.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
92
The microstrip-fed printed monopole antenna was studied in this thesis in many aspects. Since the physical size of portable communication devices is reduced greatly in recent decades, the ground plane of the products also has to be miniaturized. Besides, it is usually placed in parallel to the monopole in recent applications. This, in turn, will affect the characteristics of regular monopole antenna significantly as well. Since the electrical size of the ground plane is too small to be treated as a ’’ground”, the ground plane should be regarded as a radiator. As a result, it combines with the monopole radiator as an asymmetric dipole antenna. Besides, the feeding structure, namely microstrip-fed, causes the antenna to be as a printed sleeve dipole. This would vary the input impedance with no influence in radiation pattern. The effect of the rectangular ground plane on input impedance and radiation pattern would be discussed in detail. The antenna is an asymmetric dipole and the geometry of the ground plane distorts the pattern dramatically. In particular, the altered current distribution that affects the pattern was different from that of asymmetric slender dipole. In addition, a simple approximation method of resonant resistance estimation with the experiment figure was introduced. On the other hand, the ground plane would induce the other resonance and this could broaden the matching bandwidth efficiently. On the other hand, since the monopole is bent and placed at the side of ground plane for miniaturization in current applications, two practical topics relative to the monopole radiator of the antenna are discussed in this thesis. There include the effect of both monopole setup location shifting and bending on input impedance and radiation pattern of the microstrip-fed printed monopole antenna. Besides, the effect of the substrate was also discussed briefly.
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Tsui, Feng-Jui, and 崔逢叡. "Characteristic of CPW Fed Multi-Branch Monopole Antenna." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/28922855530943702083.
Full textAbstract:
碩士淡江大學
電機工程學系碩士班
96
For systems of personal communication services (PCS), there are continuous needs for dual-band/multi-band planar antennas because of the various services available and the limited space on the portable devices. In recent years, there had been researchers employing the multiple branch structures to obtain the multi-band operations desired. In this paper, a novel CI-shaped multiple-branch monopole antenna is introduced in order to achieve multi-band operations that cover the GSM 900, GSM 1800/1900, and the 2.4GHz ISM bands with return-loss less than -10dB. The proposed antenna is fed by a 50Ω coplanar waveguide (CPW) transmission line to benefit from the simple structure of single metallic layer and other attractive features such as wide bandwidth, no soldering point needed, and easy integration with active devices, while the multi-band characteristics of the proposed antenna are carefully studied and experimentally verified. It is found that the longer C branch (or E branch) is responsible for the radiation of the lowest band (0.9GHz), while the shorter I branch is responsible for the higher band (1.8/1.9GHz). In additions, the 2.4GHz band is contributed from the excitation of higher order mode along the C branch (or E branch). Moreover, the un-symmetric structure with extended right-hand side ground plane with extra height is employed to achieve a wide band operation covering the range from 1.4GHz to 3GHz with return-loss less than -9dB.
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Wu, Tsung-Han, and 吳宗翰. "Some Practical Planar Monopole Antenna Designs and Applications." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/07093523518059470278.
Full textAbstract:
碩士國立高雄應用科技大學
電子與資訊工程研究所碩士班
91
Some dual-band operating designs and applications of the planar monopole antenna are proposed and experimentally studied. The designs of dual-band planar monopole antenna embedded with a square slot are presented and studied in chapter 2 and 3. The major effect of the slot is to separate the radiation patch into two different radiation elements, the inner and outer monopole patches. By tuning the dimension of the inner patch can generate various frequency ratios. Besides, the dual-band operating structure of planar antenna is a wide slot antenna stacked with a ground plane. This structure looks like there are a slot antenna and a similar monopole antenna stacked together. The dual-band operating modes can be obtained in this design. The lower operating frequency is determined by the wide slot antenna and the upper operating frequency is determined by the similar monopole antenna. Finally, another planar dual-band antenna is designed by a driven planar patch and a parasitical shorted element. For this design with a 50-W microstrip feedline, the lower operating mode can be excited by the parasitical shorted element and the upper operating mode can be also excited by the driven patch.
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Rong-Yi-Huang and 黃榮益. "Shorted Monopole Antenna Design with Small Ground Plane." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/77526404904853973806.
Full textAbstract:
碩士元智大學
通訊工程學系
98
In this thesis, we focused on the design the low-frequency monopole antenna in the limited space. In the low frequency communication systems, it can not be accomplished to make a resonant monopole antenna with 0.25 λ.However, the length low-frequency antenna is usually between 0.02λto 0.2λ and radiation resistance and reactance will be decreased as radiator shorten. Therefore, we use an umbrella structure and T-types structure in Top-Load monopole antenna to enhance the radiation resistance. In umbrella antenna, the radiation resistance may be the max value when the S/h (the ratio of branch height and radiator height)= 0.43. Moreover, the larger the angle θ(the angle between radiator and branch).We will use spiral inductors as matching elements when the load monopole antenna have not been matched with communications systems. In order to get more extensive use in the limited space, we use T-monopole antenna system with fixed tower as an antenna to provide medium-frequency communications systems. Through simulation and experiment, it can enhance low-frequency antenna radiation resistance when the T-type antenna with medium frequency is used as a fixed tower. In this paper, we found that bandwidth and impedance data are almost the same when we operate the antenna size and frequency to proportional size. In conclusion, we use small size of the mechanical antenna to analyze the radiation impedance; the result was consistent with the simulation. Therefore, this paper can provide a useful reference in building on low-frequency antenna systems.
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Lee, Wei-Chih, and 李偉誌. "A NOVEL DUAL-BAND CIRCULARLY POLARIZED MONOPOLE ANTENNA." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/31332357312662293023.
Full textAbstract:
碩士大同大學
通訊工程研究所
100
A WLAN circularly polarized antenna is presented. The antenna features to have a monopole-like structure fed by a microstripline on a slit-loaded ground plane. There are also two protruded arms extended from two edges of the ground plane. It is investigated that the two arms are mainly responsible for the low-part band of this dual-band antenna. While tuning two slits on the monopole, a high-part band is formed. By this way, the dual band circular polarized antenna covers two ISM bands centered at 2.45 GHz and 5.5 GHz.
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Lin, Guosheng, and 林國聖. "Study Of Monopole Antenna For Wireless Network Applications." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/48298752897078613841.
Full textAbstract:
碩士義守大學
電子工程學系
100
In wireless communication, we need an antenna to receive/transmit the signal which is light , thin and small. This study proposed three kinds of antenna. The first one was an USI-shaped monopole antenna , applicable to WiFi. The USI-shaped antenna could receive the signal and transmit the signal at the same time . The proposed antenna is with the resonating frequency of 2.4GHz in IEEE 802.11 b/g/n, and the resonating frequency of 5.2GHz in IEEE 802.11a.The proposed antenna using one resonating route to obtain two resonating modes. The second one was an U-shaped monopole antenna which is applicable to Ultra-wideband (UWB).The design methodology is cutting the corner of radiator and ground plane , and a rectangle slot on radiator. The bandwidth of the U-shaped antenna is 3.1 GHz-10.6 GHz , and is suitable for UWB. The third one was LTE(Long Term Evolution) monopole antenna .Length of radiator strip , the inductor circuit and coupling were adopted to design the antenna . The proposed antenna is applicable to LTE700/GSM900/GSM1800/GSM1900/UMTS 2100 /LTE2600.
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Lai, Chen-Shian, and 賴辰銜. "Planar Ultra Wide Band Miniature Monopole Antenna Designs." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/68714432558127636772.
Full textAbstract:
碩士淡江大學
電機工程學系碩士班
93
The goal of this thesis is to design a miniature fully-planar antenna that satisfies for UWB (3.1GHz~10.6GHz) released by the FCC. Most of the planar monopoles reside on a large orthogonal ground plane, and thus the antennas are not fully planar structures.. The fully planar coplanar waveguide-fed or microstrip-fed UWB monopole antennas have attracted the attention of many researchers. None of them has both the impedance bandwidth and radiation bandwidth covering the UWB simultaneously. In this study, the UWB antennas are fabricated on an FR4 board of thickness 0.8mm, for which the relative dielectric constant 4.4 is used for design. In this paper, the miniature ultra wideband (UWB) fully-planar monopole antennas fed by microstrip line are investigated in order to take full advantages of the planar antenna structure, such as the light weight, small size, low cost, conformal and ease of integration with the microwave networks. The empirical formula is employed to determine the initial size of a square monopole, by which the influences of the dimensions upon the reflection coefficient are investigated. It is found that the reflection coefficient is very sensitive to the gap. It is thus proposed to change the shape and size of the gap between the monopole and the ground in order to achieve the goal of miniature wideband antenna. The optimized results show that the radiation patterns in the E plane and the omni-directional characteristic in the H-plane are improved.
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WU, CHENG-KUEI, and 吳政逵. "Design of Printed Monopole Antenna for WLAN System." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/4abt59.
Full textAbstract:
碩士國立高雄師範大學
電子工程學系
105
This paper presents planar antenna design for wireless local area networks and contain three different antenna designs. First of all, a monopole antenna can cover the operating frequency band through the adjustment of the length of the path parameters, and improve the high frequency impedance matching by the coupling between the two paths. Referring to the second monopole antenna, adjusting the main structure can control both the high frequency and low frequency bands, and the use of coupling between the two sides of the substrate can improve the low frequency impedance matching. The last one with the coplanar waveguide feeding method can reach broadband operation by adjusting the main structure and ground position. The above three antenna design can cover the WLAN system operating.
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Yang, Chin-Fu, and 楊進福. "Monopole antenna for wireless local area network application." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/t6h3mw.
Full textAbstract:
碩士國立臺北科技大學
電子電腦與通訊產業研發碩士專班
95
This paper conducted a series of research and designs on planar monopole antenna for wide-band, dual-band applications, and furthermore, this paper explored the feasibility of designing the antenna in compact size to save precious design space. Applications include WLAN band (Wireless Local Area Network, 2400-2480MHz), HIPERLAN band (High-performance Radio Local Area Network, 5150-5350MHz) and ISM band (Industrial, scientific, and medical, 5725-5875MHz). Three types of monopole antenna design are proposed in this paper; the first type is called meander line dual-band antenna. It basically uses meander line to achieve dual-band reception. The second type is called fork-shaped wide-band antenna. The two-wire design not only helps control the resonant frequency, but also generates higher gain than general monopole antenna designs do. The third type is called compact dual-band antenna. The compact design reduces the space that general monopole antenna occupies thus helps the end product designer to leverage the space for more creativity.
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Li, Ying-Chih, and 李穎智. "Study of Ceramic Monopole Implantable Antenna without Superstrate." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/04424514026680880058.
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碩士南台科技大學
電機工程系
97
The main objective of this study is to design small size and broad bandwidth monopole implantable antennas operated in Medical Implant Communications Service (MICS) (402-405 MHz) band, which can be easily implanted into the human body. Moreover, its SAR value must be lower than 1.6 W/kg and radiation efficiency is enhanced. Recently, the microwave dielectric ceramic material become very popular antenna material due to its characteristics of high dielectric constant (εr), high quality factor (Q), temperature coefficient of stability (τf). In this paper, Ceramic (εr = 27.9) and Al2O3 (εr = 9.8) are utilized to be the substrates of the implantable antennas, and CPW-fed feed structure is adopted as the patterns of the proposed antennas. According to the characteristic of high dielectric, the size of the proposed antenna fabricated by Ceramic or Al2O3 has been shrunk. In addition, the simulations concerning the antennas implanted in the different tissues by software are discussed, and the characteristics about the proposed antennas coated with glue and without superstrate are also compared. Finally, the proposed antennas are experimented in the phantom fluid and pork, and the results are demonstrated in this paper as well. Keyword: CPW, Implantable antenna
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Shih, Chun-Yin, and 石淳尹. "Compact Broadband Monopole Antenna for Digital Television Application." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/67345158971592300492.
Full textAbstract:
碩士國立臺灣大學
電信工程學研究所
97
Digital television (DTV) is an advanced technology that enables television stations to provide better pictures and sound quality. It can also offer multimedia service and great interactive capabilities. The date when television goes all digital has changed. In this thesis, we propose a compact planar monopole antenna for DTV applications on the terrestrial television broadcasting. The proposed antenna can be printed on dielectric substrate by using printed circuit board technique. Also, the proposed antenna has good feature owing to its low cost in fabrication and ease of construction. It can be easily placed into a portable device such as notebook or TV box. The proposed monopole antenna which consists of microstrip line and a patch with rectangular slits. The wideband property is achieved by using a ground plane with notch and a slotted plane on the monopole back side. These techniques are used to enhance the impedance-matching of the proposed antenna. The proposed antenna can provide a wide operating bandwidth for DVB-T signal reception in the UHF band. The measured radiation patterns show the good characteristics in the operating frequency bands. Details of the proposed antenna designs, analysis, and experimental results of the constructed prototypes are also included.
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De-Jian, Lin, and 林德建. "Dielectric Covered Monopole Antenna on a Conducting Box." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/64176130303041450898.
Full textAbstract:
碩士國立臺灣大學
電機工程研究所
84
A dielectric covered monopole antenna mounted on a conducting box for use in the wireless LAN is studied. For the purpose of analysis, we solve the input impedance and current distribution of a dielectric covered monopole near the metallic wedges by replacing the dielectric layer with an equivalent electric current and using the reciprocity theory and the Moment Method / Uniform Theory of Geometrical Diffraction (UTD) hybrid technique. We then use the solved current distribution to calculate the radiation pattern using UTD. Finanlly, we use the simulation result to design the dielectric covered monopole that fit our design specification. The accuracy of the theory is verified by comparing the results of measurement and calculation.
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Yang, Shu-Wei, and 楊書維. "Inset Feeding Configuration for A DTV Monopole Antenna." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/83cg8z.
Full textAbstract:
碩士大同大學
通訊工程研究所
95
In the thesis, a DTV (Digital television) monopole antenna with an inset feeding configuration is proposed. This monopole antenna has to satisfy the frequency band which is used by DTV (470 MHz to 806 MHz). Therefore, it connects a patch with inset feeding configuration. The goal of wideband is achieved to efficiently increase the impedance bandwidth by appropriating tuning the configuration. In addition, after achieving the above goal, integrate a rectangle metallic plane in back of FR4 without influencing the radiating pattern of the band of DTV. Then, using the method of coupling excites the current which is on the rectangle metallic plane. Additionally, the length, width and position of the rectangle metallic plane to make the retune loss of 2.4 GHz to 2.484 GHz lower than -10 dB, which conforms the using band of WLAN.
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Elfergani, Issa T., Abubakar S. Hussaini, Mohammed S. Bin-Melha, Raed A. Abd-Alhameed, Chan H. See, M. M. Abusitta, and Jonathan Rodriguez. "Compact design of tuneable band-notched monopole wideband antenna." 2013. http://hdl.handle.net/10454/9646.
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