Journal articles: 'Dielectric filter'

1

Pietrikova, Alena, Kornel Ruman, Tibor Rovensky, and Igor Vehec. "Impact analysis of LTCC materials on microstrip filters’ behaviour up to 13 GHz." Microelectronics International 32, no. 3 (August 3, 2015): 122–25. http://dx.doi.org/10.1108/mi-01-2015-0003.

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Purpose – The purpose of this paper is to consider the adequacy of various microstrip filters’ behaviour based on different low-temperature co-fired ceramic (LTCC) dielectrics in the high frequency (HF) area up to 13 GHz. Design/methodology/approach – Low pass, band pass and band stop filters for ultra-wideband radar systems were designed, simulated, fabricated and measured using three various dielectric substrates: Dupont GreenTape 951, Dupont GreenTape 9K7 and Murata LFC. Findings – It is not possible to unambiguously determine the most suitable LTCC dielectric for these filter design because, in general, all designed filters fulfilled requirements (attenuation, cut off frequencies) with minimal divergences, but temperature-stable dielectric and physical properties of Murata LFC make them a promising ceramic for HF application (repeatability of realised experiments). Originality/value – The novelty of this work lies in unconventional usage of LTCC as material with defined dielectric properties proper for HF applications.

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Futamata, Masayuki. "Dielectric Filter for Highly Sensitive Raman Spectroscopy." Applied Spectroscopy 50, no. 2 (February 1996): 199–204. http://dx.doi.org/10.1366/0003702963906528.

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A filter spectrometer using dielectric bandpass filters eliminates Rayleigh scattering down to 10-5 while passing more than 90% of Raman signal from 50 to 2000 cm−1. It improves the optical throughput about 8–9 times in comparison to a double-stage subtractive monochromator, and about 20% in comparison to a holographic notch filter. Moreover, transmittance of the filter spectrometer does not depend on polarization of the incident light at the optimum angle. Raman spectra from powder sample of bismuth oxide and copper phthalocyanine and liquid sample of carbon tetrachloride in a glass capillary were easily observed down to 50 cm−1 with the use of the filter spectrometer combined with a single-stage monochromator.

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Mezaal, Y. S., H. H. Saleh, and H. Al-saedi. "New Compact Microstrip Filters Based on Quasi Fractal Resonator." Advanced Electromagnetics 7, no. 4 (September 3, 2018): 93–102. http://dx.doi.org/10.7716/aem.v7i4.883.

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This paper presents new microstrip devices as single band bandpass and multi band bandstop filters. The proposed filters use slotted patch microstrip resonator based on quasi fractal geometry, simulated by AWR12 software package. Both filters have quasi elliptic frequency response, designed at centre frequency of 2.437 GHz for bandpass filter and at band frequencies of 2.434, 4.032, 4.976 and 5.638 GHz GHz respectively, for multi bandstop filter. All filters are employed using RT/Duroid 6010.8 LM substrate of dielectric constant and 1.27 mm dielectric thickness. Simulation results show that the designed quasi fractal bandpass filter has very narrow fractional bandwidth of 0.38 % which is very rare in microstrip filter design. On the other hand, the projected bandstop filter offers multi narrow rejection bands that is useful in broadband wireless schemes influencing from fixed interferences. Both filters present satisfactory S11 and S21 responses besides smallness properties that stand for interesting features of the newest wireless applications. The simulated and measured frequency responses for both designed filters are in good agreement.

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Hsu, Ming Wei, Man Long Her, Wen Ko, and Yu Lin Wang. "Design and Analysis of Dual-Mode Double-Ring Resonator for Dual-Band Bandpass Filter Applications." Applied Mechanics and Materials 321-324 (June 2013): 376–82. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.376.

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In this paper, two types of miniaturized dual-mode bandpass filters (BPF), a single-ring (SR) resonator, and a double-ring (DR) resonator are developed. By applying the capacitive-coupling technique to a dual-mode ring filter, a technique is proposed to miniaturize the dual-mode double-ring filter. An adjustable dual-band bandpass filter is achieved by developing a ring resonator where the two modes are capacitively coupled. Control of the filter center frequency is determined by the diameter of the ring and by the rings annular width. Filter coupling amount can also be adjusted by disturbance (perturbation) of an open stub attached to the annular disc. Proposed filters explore both single- and double-ring architectures. A single-ring resonator acting as a dual bandpass filter to allow 3.8 GHz and 7.8 GHz single is developed. A double-ring resonator to allow 2.05 GHz and 3.9 GHz signals is also developed. The ring resonators are fabricated on RO-4003 substrate, with relative dielectric constant of 3.38, thickness of 0.8 mm, and dielectric loss tangent of 0.0025. Results indicate the filters can be applied in the communications field.

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KATSUKI, Rie, Hiroshi TAKAHASHI, Junya TANAKA, Toshikatsu AKIBA, Hiroaki IKEUCHI, Hiroyuki KAYANO, Noritsugu SHIOKAWA, and Tamio KAWAGUCHI. "WeD-1-4 Dielectric Driving Device for Superconducting Filter Tuning." Proceedings of JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE 2015 (2015): _WeD—1–4–1—_WeD—1–4–3. http://dx.doi.org/10.1299/jsmemipe.2015._wed-1-4-1.

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Trubin, Alexander. "MUTUAL COUPLING COEFFICIENTS OF ROTATING RECTANGULAR DIELECTRIC RESONATORS IN CUT-OFF RECTANGULAR WAVEGUIDE." Information and Telecommunication Sciences, no. 1 (June 29, 2021): 48–54. http://dx.doi.org/10.20535/2411-2976.12021.48-54.

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Background. A further increase in the speed of information transfer is determined by more stringent requirements for the elements of communication devices. One of the most important components of such devices is various filters, which are often made on the basis of dielectric resonators. Calculation of the parameters of multi-section filters is impossible without further development of the theory of their design. The development of filter theory is based on electrodynamic modelling, which involves calculating the coupling coefficients of dielectric resonators in various transmission lines. Objective. The aim of the research is to calculate and study the coupling coefficients of rectangular dielectric resonators with a rectangular metal waveguide when their axes rotate. Investigation of new effects to improve the performance of filters and other devices based on them. Methods. Methods of technical electrodynamics are used to calculate and analyse the coupling coefficients. The end result is to obtain new analytical formulas for new structures with rectangular dielectric resonators, which make it possible to analyse and calculate their coupling coefficients. Results. New analytical expressions are found for the coupling coefficients of dielectric resonators with the rotation of their axes in a rectangular waveguide. Conclusions. The theory of designing filters based on new structures of dielectric resonators with rotation of their axes in metal waveguides has been expanded. New analytical relationships and new patterns of change in the coupling coefficients are found. Keywords: dielectric filter; rectangular dielectric resonator; rotation; coupling coefficients.

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Aly, Aly H., Badawy El-Sharawy, and Adalbert Beyer. "Modeling and Measurements of Novel Monolithic Filters." Active and Passive Electronic Components 2008 (2008): 1–8. http://dx.doi.org/10.1155/2008/537069.

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This paper presents novel multilayer tuneable highQ-filters based on hairpin resonators including ferroelectric materials. This configuration allows the miniaturization of these filters to a size that makes them suitable for chip and package integration and narrow-band applications. The main focus was miniaturizing filters with coupled loops using multilayer dielectric substrates. A further goal was to increase the quality factor of these distributed filters by embedding high dielectric materials in a multilayer high- and low-k(dielectric constant) substrate that is supported by LTCC technology. An improved W-shape bandpass filter was proposed with a wide stopband and approximately 5% bandwidth.

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8

Chi-Yang Chang and Wei-Chen Hsu. "Photonic bandgap dielectric waveguide filter." IEEE Microwave and Wireless Components Letters 12, no. 4 (April 2002): 137–39. http://dx.doi.org/10.1109/7260.993293.

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Wang, Xuying, Ke Bi, Yanan Hao, and Ming Lei. "Thermally tunable dielectric resonator filter." Journal of Alloys and Compounds 749 (June 2018): 363–68. http://dx.doi.org/10.1016/j.jallcom.2018.03.263.

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Xu, Kai, Yanlong Meng, Shufen Chen, Yi Li, Zhijun Wu, and Shangzhong Jin. "All-Dielectric Color Filter with Ultra-Narrowed Linewidth." Micromachines 12, no. 3 (February 27, 2021): 241. http://dx.doi.org/10.3390/mi12030241.

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In this paper, a transmissive color filter with an ultra-narrow full width at half of the maximum is proposed. Exploiting a material with a high index of refraction and an extremely low extinction coefficient in the visible range allows the quality factor of the filter to be improved. Three groups of GaP/SiO2 pairs are used to form a Distributed Brag reflector in a symmetrical Fabry-Pérot cavity. A band-pass filter which is composed of ZnS/SiO2 pairs is also introduced to further promote the purity of the transmissive spectrum. The investigation manifests that a series of tuned spectrum with an ultra-narrow full width at half of the maximum in the full visible range can be obtained by adjusting the thickness of the SiO2 interlayer. The full width at half of the maximum of the transmissive spectrum can reach 2.35 nm. Simultaneously, the transmissive efficiency in the full visible range can keep as high as 0.75. Our research provides a feasible and cost-effective way for realizing filters with ultra-narrowed linewidth.

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Sargent, Robert B., and Nada A. O'Brien. "Dielectric Materials for Thin-Film-Based Optical Communications Filters." MRS Bulletin 28, no. 5 (May 2003): 372–76. http://dx.doi.org/10.1557/mrs2003.103.

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AbstractExplosive growth in the fiber-optic telecommunications infrastructure during the past decade has driven noteworthy advances in thin-film-based optical interference filter technology. In particular, the widespread deployment of wavelength-division multiplexing (WDM), a means of increasing the communication capacity of an optical fiber by utilizing more than one wavelength of light, has motivated significant improvements in bandpass filter performance. A common requirement is for filters that combine or separate wavelengths spaced 100 GHz (0.8 nm) apart. The foundation for these recent breakthroughs has been laid by the development of optical coating technology over the past century. This article reviews the materials and processes used in the production of thin-film-based optical communications filters.

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12

Cao, Bing, Gui Ju Zhang, Chin Hua Wang, Jian Feng Wang, and Ke Xu. "Narrowband Notch Filters with Composite Nanostructure Layers on a GaN-Based Light Emitting Diode." Advanced Materials Research 486 (March 2012): 114–18. http://dx.doi.org/10.4028/www.scientific.net/amr.486.114.

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In this paper, novel active narrowband notch filters with triple-layer composite nanostructures on a GaN-based LED are obtained by mainly adjusting the grating period and duty cycle. The three layers consist of two dielectric thin layers and one metallic / dielectric grating layer. The grating layer composes of subwavelength period and thickness rectangular stripes, which lies between a transition layer and a protecting layer. Line-width and attenuation peak properties of the resonance filters are calculated and investigated by using a full vector implementation of Rigorous Coupled Wave Analysis (RCWA) algorithm. It is shown that the grating period can significantly change the filter peak wavelength, and the grating duty cycle heavily changes the filter line-width. The filter attenuation peak has a red shift with 23.3nm as the grating period increases 18nm. The FWHM (Full Width at Half Maximum) of the filter reduces from 1.9nm to 0.28nm as the duty cycle changes from 0.55 to 0.3, which compressed more than six times. Moreover, thickness of each composite nanostructure layer can also affect the narrowband width and peak wavelength of the filter. The results provide guidance in designing, optimizing and fabricating such an active narrowband filter with highly integrated photonic devices.

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13

Luo, Chunya, Zhichao Ma, Laisheng Hu, Mingzhe Hu, and Xiaomin Huang. "Research on sintering behavior and microwave dielectric property of (Mg0.95Ca0.05)TiO3 ceramics for cross coupling filter." Modern Physics Letters B 29, no. 34 (December 20, 2015): 1550220. http://dx.doi.org/10.1142/s0217984915502206.

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The microwave dielectric properties of [Formula: see text]–[Formula: see text] (abbreviated as 95MCT hereafter) ceramics have been studied for application in dielectric cross coupling filters. [Formula: see text] and [Formula: see text] were selected as liquid sintering aids to lower the sintering temperature and enhance the Qf value of 95MCT and simultaneously we varied the mole ratio of [Formula: see text] to tune the microwave dielectric properties of 95MCT. When the [Formula: see text] mole ratio was 1.5 and the co-doping content was 0.25 wt.%, the optimal sintering temperature of 95MCT ceramic could be lowered from [Formula: see text] to [Formula: see text] and the Qf value could be improved by about 7.7%. The optimal microwave dielectric properties obtained under this condition were Qf = 72730 GHz (6.8 GHz), [Formula: see text] and [Formula: see text], which demonstrated great potential usage in ceramic industry. High values of Qf ceramic were used to design the dielectric cross coupling filter. The dielectric filter measured at 2.35 GHz exhibited a 6.7% bandwidth (insert loss [Formula: see text] dB) of center frequency.

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Dmitrikov, Vladimir F., Alexander Yu Petrochenko, Vyacheslav M. Isaev, and Dmitriy V. Shushpanov. "Features of designing line radio interference filter in a wide frequency range, taking into account equivalent circuits for capacitors and inductors." Physics of Wave Processes and Radio Systems 23, no. 4 (February 11, 2021): 85–96. http://dx.doi.org/10.18469/1810-3189.2020.23.4.85-96.

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Based on the phenomenological equations describing the dynamic processes of magnetization of ferromagnets of inductors and polarization of capacitor dielectrics, taking into account complex frequency-dependent dielectric constants e(jw) of capacitor dielectrics and magnetic permeabilities m(jw) of inductor cores, equivalent electrical structural-parametric and capacitor replacement circuits were obtained. The connection of parasitic elements of equivalent electric circuits of capacitors and inductors with the electrophysical characteristics of the material of the dielectric of the capacitor and the inductor core, which determine their frequency properties, structure and parameters of the elements of the equivalent circuit, is established. The features of the design of line radio interference filter taking into account the parasitic parameters of the inductors and capacitors of line radio interference filter, found as a result of the synthesis of equivalent electric circuits of the inductors and capacitors in a wide frequency range of 150 kHz 30 MHz.

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Melhem, Zeina, Chadi Nader, B. Bayard, J. Bechara, and Jean Jacques Rousseau. "Microstrip Bandpass Sensor Based on Distributed Capacitors." Advanced Materials Research 324 (August 2011): 445–48. http://dx.doi.org/10.4028/www.scientific.net/amr.324.445.

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A microstrip bandpass filter with rectangular patch coupled resonator is presented. The filter is designed to be more affected by the dielectric layer above the conductors compared to the same type of parallel-coupled bandpass filter. The filter is designed to operate between 1 GHz to 3 GHz and this can be a sensor base on distributed capacitors. The agreement between the circuit simulator and measured results is excellent and gives a very good prediction for the filter characteristics. The aim of this prototype filter is to show insertion loss (IL) at the bandpass transmission response when a dielectric material is above or near the conductors. A large study around the sensibility and the effect of the dielectric layer is done in order to evaluate its performance in detection and dielectric characterization.

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Mai, Hanh Hong. "Designing multilayer dielectric filter based on TiO2/SiO2 for fluorescence microscopy applications." Computer Optics 44, no. 2 (April 2020): 209–13. http://dx.doi.org/10.18287/2412-6179-co-618.

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This study presents a new construction design of a distributed Bragg reflector (DBR) filter and a Fabry–Pérot (FP) filter by using needle technique as a synthesis method. The optimized DBR and FP filters having a proper number of layers with controlling thickness TiO2/SiO2 are utilized to transmit only a certain narrow band of wavelengths while blocking the others. As a proof of concept, the filters are designed to selectively transmit only a very narrow band of wavelength at 780 nm which is the near infrared (NIR) fluorescent emission from Alexa Fluor 750 dye. The obtained results show that the optimized filters represent advanced spectral performance which can be used to improve the sensitivity and the imaging contrast in fluorescence microscopy.

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Moradi, Bahareh, and Joan Garcia. "High dielectric ring resonators for designing passive filter." Materials International 1, no. 2 (December 30, 2019): 25–28. http://dx.doi.org/10.33263/materials12.025028.

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In this paper, the utilization of high dielectric constant resonator as a passive element for design of filter in the range of Ku band is investigated. The design is based on a new kind of dielectric resonator fabricated with a commercial high dielectric constant EPOXY paste. The design is based on a microstrip line periodically loaded with a new kind of dielectric resonator fabricated with a commercial high dielectric constant Epoxy paste compatible with serigraphy and screen printing technology.

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Zha, Shenghao, Hongzhou Zhang, Changli Sun, Yifan Feng, and Jiangang Lu. "Multi-Wavelength Filters of Templated Blue Phase Liquid Crystal." Crystals 9, no. 9 (August 30, 2019): 451. http://dx.doi.org/10.3390/cryst9090451.

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The multi-wavelength filters in the visible light band using the blue phase liquid crystal (BPLC) template was investigated. A multi-layer templated BPLC (T-BPLC) filter without intermediate dielectric layers was fabricated, which may reflect multi-wavelength in one filter. Compared with the cholesteric liquid crystal (CLC) filter, the T-BPLC filter may get a much narrower reflection bandwidth (<15 nm), show better angular stability of incident light, and have a more stable wavelength and bandwidth with a temperature shift. Furthermore, the central wavelength and bandwidth can be easily controlled by the fabrication process and the optimization of the material concentration. When the incident angle varies, the shift of the center wavelength of the T-BPLC filter is much smaller than that of the CLC filter. The multi-wavelength filter shows a potential application in color filters and high-density wavelength division multiplexed networks.

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Ghadiya, Ambrish, Shilpi Soni, and Keyur Trivedi. "Q-band cross-coupled dielectric resonator filter using TM mode for satellite application." International Journal of Microwave and Wireless Technologies 10, no. 2 (February 13, 2018): 235–41. http://dx.doi.org/10.1017/s1759078718000107.

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AbstractA new structure of Q-band filter comprising rectangular high-permittivity dielectric resonators (DR) operating at TM11δ mode is introduced. The resonator shows high-quality factor (Q) and wide spurious free window compared with other technologies available at Q-band for realizing filters. Low permittivity ceramic material (quartz) is used as a support for holding DR at the center of the cavity. An eight-pole cross-coupled band-pass filter having a bandwidth of 225 MHz at 38.5 GHz was realized. Resonant coupling structure is introduced to realize cross-coupling in filter. The resonator assemblies were optimized precisely to achieve effective linear frequency drift over temperature of the order of 2 ppm/°C. The filter also survived severe sine and random vibration test for satellite application.

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Wang, Gang, Li Xin Xu, and Ting Wang. "Threshold Values Analysis of Substrate Parameters Based on MEMS Microstrip Filter." Key Engineering Materials 483 (June 2011): 745–49. http://dx.doi.org/10.4028/www.scientific.net/kem.483.745.

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High frequency filters are important components in microwave facilities application. With miniature volume, high performance and integratability, MEMS microstrip filter can significantly improve performance of Radio frequency system. By calculating chebyshev coupled microstrip bandpass filter design scheme, Threshold values of MEMS microstrip substrate parameters are defined to analyze dimensions variation property of MEMS microstrip filter relates with substrate parameters. Selection principle of substrate parameters for MEMS microstrip filter is presented, which indicates thickness and relative dielectric constant of substrate should not exceed the threshold values. The principle of threshold values can be applied as a guide on research and application of MEMS microstrip filter.

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Ke, Yougang, Yachao Liu, Junxiao Zhou, Yuanyuan Liu, Hailu Luo, and Shuangchun Wen. "Photonic spin filter with dielectric metasurfaces." Optics Express 23, no. 26 (December 15, 2015): 33079. http://dx.doi.org/10.1364/oe.23.033079.

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Zhu, Yan-Yuan, Yun-Li Li, and Jian-Xin Chen. "A Novel Dielectric Strip Resonator Filter." IEEE Microwave and Wireless Components Letters 28, no. 7 (July 2018): 591–93. http://dx.doi.org/10.1109/lmwc.2018.2840962.

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Jiang, Junwen, and Raafat R. Mansour. "Wideband Dielectric Substrate-Loaded Cavity Filter." IEEE Transactions on Microwave Theory and Techniques 68, no. 1 (January 2020): 111–20. http://dx.doi.org/10.1109/tmtt.2019.2948328.

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Hu, Shanwen, Yunqing Hu, Yiting Gao, Xiaodong Zhang, Xinlei Zhang, Zixuan Wang, Bo Zhou, Zhikuang Cai, and Yufeng Guo. "A Compact UWB Bandpass Chip Filter on a GaAs Substrate with Modified Chebyshev Structure." Electronics 9, no. 2 (February 11, 2020): 313. http://dx.doi.org/10.3390/electronics9020313.

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Ultra-Wideband (UWB) systems are widely used in low-power, high-speed, high-security short-range wireless communication systems throughout digital homes and offices. In the RF front-end of a UWB system, bandpass filters (BPFs) are used to put through the passband signals and reject the stopband signals. Most UWB BPFs are designed with dielectric materials on circuit boards or LTCC technology. In this paper, a very compact fully integrated UWB chip filter is proposed and designed on a GaAs substrate with nitride as dielectric layers to meet the small size requirement of portable devices for next-generation UWB applications. The filter is constructed with a modified Chebyshev structure. The final filter circuit contains only four inductors instead of six for the conventional Chebyshev filter, which makes the chip more compact and cost effective. The filter is designed and fabricated on a 0.25 μm GaAs pHEMT technology with a chip size of only 0.73 mm × 0.51 mm including the chip edge and scribe line area, while the filter core area is only 0.61 mm × 0.39 mm, including bonding PADs. The measurement results illustrated that the proposed BPF shows a passband covering the frequency range of 3.1–9.0 GHz, the minimum passband insertion loss is only 1.5 dB, the stopband rejection is better than −30 dB throughout frequencies below 2 GHz and above 12 GHz, S11 is less than −16 dB, and S22 is better than −11 dB during the whole passband range. It demonstrated that the proposed filter can be considered as one of the most compact UWB filters.

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Et.al, Kavitha Devi CS. "A Compact Bandpass Microstrip Filter for Wireless Communication Applications." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 6 (April 10, 2021): 161–65. http://dx.doi.org/10.17762/turcomat.v12i6.1281.

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A design of Compact Bandpass Microstrip Filter is proposed for wireless communication applications like Bluetooth, Wi-Fi, and 5G. Filter is constructed using parallel-coupled Microstrip lines to form 5th order filter of an inverted C structure. Ground slotted technique is used to enhance the bandwidth with dielectric constant of 9.9. The designed filter is simulated at a center frequency of 5.87GHz and bandwidth of 1.9GHz with an insertion loss of -0.5dB, return loss of greater than 12dB. The proposed filter has a compact size, good increased bandwidth and cost-effective. These results are verified with the theoretically designed values and good agreements are recorded. Hence the proposed compact filter will provide a platform for designing and development of compact filters for the microwave regime.

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Pajewski, Lara, and Giuseppe Schettini. "A Photonic-Crystal Selective Filter." Journal of Telecommunications and Information Technology, no. 3 (2017): 107–12. http://dx.doi.org/10.26636/jtit.2017.119817.

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A highly selective filter is designed, working at 1.55 μm and having a 3-dB bandwidth narrower than 0.4 nm, as is required in Dense Wavelength Division Multiplexed systems. Different solutions are proposed, involving photonic crystals made rectangular- or circular-section dielectric rods, or else of holes drilled in a dielectric bulk. The polarization and frequency selective properties are achieved by introducing a defect in the periodic structure. The device is studied by using in-house codes implementing the full-wave Fourier Modal Method. Practical guidelines about advantages and limits of the investigated solutions are given.

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Yang, Jun, Yang Yang, Peng Wang, Guangsheng Deng, Fei Cai, Hongbo Lu, and Zhiping Yin. "Design and Experiment of Wideband Filters Based on Double-Layered Square-Loop Arrays in the F-Band." Applied Sciences 8, no. 9 (September 15, 2018): 1669. http://dx.doi.org/10.3390/app8091669.

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We present a wideband metamaterial (MM) filter based on a metal-dielectric-metal (MDM) structure. The proposed structure consists of a quartz dielectric substrate and two metallic square-loop arrays, which were deposited on both surfaces of the substrate. The performance of the proposed design was numerically simulated by considering the angle of incidence. The surface current and electric field distributions were calculated for the two resonant frequencies to examine the intrinsic mechanism of the proposed filter. The transmittance of the structure for various oblique angles of incidence was also analyzed. It is generally challenging to completely align the two metallic layers due to limitations in the manufacturing process. Hence, the influence of periodic misalignment on wave propagation was studied. Furthermore, a prototype of the proposed structure was fabricated and the transmission spectra were measured. Simulation and experimental results reveal that our proposed filter can achieve wideband transmission in the F-band. This work is valuable for the design of broadband filters in millimeter and terahertz waves.

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Wu, Zhao Xia, Yuan Long Shao, Wen Chao Li, and Er Dan Gu. "Two Dimensional Photonic Filter with a Circular Resonant Cavity." Advanced Materials Research 712-715 (June 2013): 1751–54. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1751.

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A new type of the two dimensional photonic filter which includes two in-line waveguides and a circular ring resonant cavity is presented in this paper. By using Finite Difference Time Domain (FDTD) method, we calculated and demonstrated the broadband frequency response of the filter and analyzed the impact of changing the dielectric constant of the inner rods on the transmission characteristics of the filter. Compared with the transmission characteristics of a micro-cavity,our numerical results show that such a filter can transmit multiple narrowband signals simultaneously. The number of the passbands of the filter increases with the rings of inner dielectric rods in the cavity. The center wavelength of the passbands can be tuned by adjusting the dielectric constant of the whole rods and inner rods without changing the size of the cavity..

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Dzakmic, Sejla, and Sehabeddin Taha Imeci. "A dual resonance high frequency bandpass filter." Sustainable Engineering and Innovation 2, no. 1 (January 21, 2020): 1–9. http://dx.doi.org/10.37868/sei.v2i1.26.

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This paper presents a design of dual resonance high frequency bandpass filter using Sonnet EM Simulator. Filter prototype is enhanced by adding the short stub in the center of the design. A parametric study shows the impact of choosing appropriate configuration characteristics. This is a dual resonance bandpass filter design, with center frequencies and . Performed input match at first resonance is and insertion loss is . The obtained results at second resonance are and . Due to its characteristics, this is a high-Q medium bandwidth dual resonance bandpass filter. The design is simulated and planning to be fabricated with 0.36 mm thickness and dielectric constant . This paper benefits from its compact size and simple geometry over the similar filters found in literature.

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Liu, Qiu, Shen, Jiao, Ye, Xie, Wang, Xiao, and Zhao. "Additive Manufacturing of Monolithic Microwave Dielectric Ceramic Filters via Digital Light Processing." Electronics 8, no. 10 (September 20, 2019): 1067. http://dx.doi.org/10.3390/electronics8101067.

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Microwave dielectric ceramics are employed in filters as electromagnetic wave propagation media. Based on additive manufacturing (AM) techniques, microwave dielectric ceramic filters with complex and precise structures can be fabricated to satisfy filtering requirements. Digital light processing (DLP) is a promising AM technique that is capable of producing filters with high accuracy and efficiency. In this paper, monolithic filters made from Al2O3 and TiO2, with a molar ratio of9:1 (0.9 Al2O3-0.1 TiO2), were fabricated by DLP. The difference in the dielectric properties between the as-sintered and post-annealed samples at different temperatures was studied. The experimental results showed that when sintered at 1550 °C for 2 h and post annealed at 1000 °C for 5 h, 0.9 Al2O3-0.1 TiO2 exhibited excellent dielectric properties: εr = 12.4, Q × f = 111,000 GHz, τf = + 1.2 ppm/°C. After comparing the measured results with the simulated ones in the passband from 6.5 to 9 GHz, it was concluded that the insertion loss (IL) and return loss (RL) of the filter meet the design requirements.

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Farida, Fitri, and Eko Setijadi. "Perancangan Filter Bandpass dengan Teknik Penggabungan Filter Lowpass dan Highpass." Jurnal Sustainable: Jurnal Hasil Penelitian dan Industri Terapan 7, no. 1 (August 7, 2018): 32–38. http://dx.doi.org/10.31629/sustainable.v7i1.436.

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UWB technology started to become an attraction in the field of research since the Federal Communications Commission (FCC) allowing this communication is used for commercial communications at a frequency (3.1 GHz - 10.6 GHz). UWB has a very wide frequency range so that in practice there is often interference due to signal interference. Therefore in UWB system filter design is required to maintain UWB device. In telecommunications, filter is a transmission device that has the function to pass the desired frequency. In this paper designed bandpass filter which is applied for UWB technology. The designed bandpass filter is a combination of a lowpass filter (LPF) and a highpass filter (HPF). The lowpass filter has the characteristic of passing a frequency lower than its cut-off frequency. The highpass filter has the characteristic passing a frequency higher than its cut-off frequency. Considering the characteristics of both filters, the bandpass filter (BPF) is a combination of lowpass and highpass filters. In this research designed lowpass filter in microstrip technology with step-impedance method, that is by combining high impedance microstrip and low impedance microstrip with a certain length. As for designing HPF using the distribution method of short circuit stubs by adding via ground on each stub. The design of this filter uses Roger substrate RT 5880 with dielectric constant er = 2,2 with thickness (h) = 0.508 mm. In this research it can be concluded that bandpass filter can be designed with lowpass and highpass filter incorporation method, although at the merging of highpass and lowpass structures is disturbed by each other, but overall design shows matching bandpass. Keywords—Microstrip, Lowpass Filter, Highpass Filter, Bandpass Filter.

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Abdelghfar, Ahmed, Mohamed A. Mousa, Bassant M. Fouad, Ahmed H. Saad, Noha Anous, and Noha Gaber. "Electrostatically Tuned Optical Filters Based on Hybrid Plasmonic-Dielectric Thin Films for Hyperspectral Imaging." Micromachines 12, no. 7 (June 29, 2021): 767. http://dx.doi.org/10.3390/mi12070767.

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Hyperspectral imaging has a wide range of uses, from medical diagnostics to crop monitoring; however, conventional hyperspectral imaging systems are relatively slow, bulky, and rather costly. In this paper, we present an inexpensive, compact tunable optical filter for hyperspectral applications. The filter is based on a Fabry-Pérot interferometer utilizing hybrid metallic-dielectric mirrors and actuated using a MEMS electrostatic actuator. The optical filter is designed using the transfer matrix method; then, the results were verified by an electromagnetic wave simulator. The actuator is based on a ring-shaped parallel plate capacitor and is designed using COMSOL Multiphysics. An actuation displacement of 170 nm was used, which is the required distance to tune the filter over the whole visible range (400–700 nm). There are two designs proposed for the optical filter: the first was optimized to provide maximum transmission and the other is optimized to have minimum full-width-half-maximum (FWHM) value. The first design has a maximum transmission percentage of 94.45% and a minimum transmission of 86.34%; while the minimum FWHM design had an average FWHM value of 7.267 nm. The results showed improvements over the current commercial filters both in transmission and in bandwidth.

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Pelliccia, Luca, Fabrizio Cacciamani, Cristiano Tomassoni, and Roberto Sorrentino. "Ultra-compact high-performance filters based on TM dual-mode dielectric-loaded cavities." International Journal of Microwave and Wireless Technologies 6, no. 2 (December 3, 2013): 151–59. http://dx.doi.org/10.1017/s1759078713001001.

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Ultra-compact band-pass filters with Nth-order pseudoelliptic response are presented allowing dramatic volume and mass savings (up to about 90%) compared to conventional filters at the price of a modest Q-factor reduction. TM dual-mode cavities loaded with high-permittivity (εr > 30) ceramic cylinders are employed, while non-resonating modes are used to create N transmission zeros symmetrically or non-symmetrically located in the pass-band. A single cavity behaves as a generalized doublet generating two transmission poles and two transmission zeros and is used as a basic building block for N-pole and N-zero filters with symmetric or asymmetric response. To prove the effectiveness of the approach, a very compact fourth-order filter with 4.35 GHz center frequency, four transmission zeros has been designed, fabricated, and tested showing an unloaded Q close to 2000. It is finally shown that the filter response can be shifted in frequency by simply replacing the dielectric material with another having different εr, so that the same metal enclosure can be used to realize various filters operating at different frequency bands.

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SI, LI-MING, and XIN LV. "TERAHERTZ WAVES HAIRPIN MICROSTRIP BAND-PASS FILTER AND ITS APPLICATION TO OVERLAID DIELECTRIC MATERIAL DETECTION." Modern Physics Letters B 22, no. 29 (November 20, 2008): 2843–48. http://dx.doi.org/10.1142/s0217984908017412.

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A novel terahertz (THz) waves band-pass filter with the center frequency of 880 GHz and low insertion loss using microstrip line hairpin resonators is introduced. The properties of this filter are investigated by finite element method (FEM) simulations. The numerical result shows that the filter has a 3 dB bandwidth from 865 GHz to 892 GHz and has 80 GHz bandwidth better than -10 dB. Resonance frequency shifts of the filter covered by dielectric materials of different permittivity and thickness are calculated, which shows that this type of filter is suitable for detecting the properties of overlaid dielectric materials.

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Jang, Young-Soo, Jong-Chel Kim, Seung-Wan Kim, and Kie-Jin Lee. "Layered-Type Dielectric Waveguide Filter Using Ceramic." Journal of Korean Institute of Electromagnetic Engineering and Science 24, no. 2 (February 28, 2013): 122–27. http://dx.doi.org/10.5515/kjkiees.2013.24.2.122.

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Maiboroda, D. V. "REJECTION FILTER BASED UPON INVERTED DIELECTRIC WAVEGUIDE." Telecommunications and Radio Engineering 74, no. 9 (2015): 779–85. http://dx.doi.org/10.1615/telecomradeng.v74.i9.30.

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White, R., and M. Reza Taherian. "Measuring the dielectric permittivity of filter cakes." Measurement Science and Technology 4, no. 9 (September 1, 1993): 1021–23. http://dx.doi.org/10.1088/0957-0233/4/9/018.

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Xi Wang, Ke-Li Wu, and Wen-Yan Yin. "A Novel Surface-Mounted Monoblock Dielectric Filter." IEEE Transactions on Components, Packaging and Manufacturing Technology 4, no. 11 (November 2014): 1822–27. http://dx.doi.org/10.1109/tcpmt.2014.2347342.

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D’souza, Nirmala Maria, and Vincent Mathew. "Tunable filter using ferroelectric-dielectric periodic multilayer." Applied Optics 54, no. 9 (March 11, 2015): 2187. http://dx.doi.org/10.1364/ao.54.002187.

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Jyani, Ashok K., Seema Awasthi, and Animesh Biswas. "Multilayer multipermittivity ring dielectric resonator antenna filter." Microwave and Optical Technology Letters 57, no. 5 (March 25, 2015): 1147–52. http://dx.doi.org/10.1002/mop.29042.

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Qian, Qinyu, Sun Ti, and Chinhua Wang. "All-dielectric ultra-thin metasurface angular filter." Optics Letters 44, no. 16 (August 7, 2019): 3984. http://dx.doi.org/10.1364/ol.44.003984.

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Chen, Pin Ao. "The performance of dielectric coated mesh filter." International Journal of Infrared and Millimeter Waves 8, no. 1 (January 1987): 29–33. http://dx.doi.org/10.1007/bf01010643.

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Reiser, P. A. "Calculation of Lossy Dielectric Multilayer Filter Response." Journal of Scientific Computing 25, no. 3 (December 2005): 499–513. http://dx.doi.org/10.1007/s10915-004-4808-2.

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Bi, Ke, Xuying Wang, Yanan Hao, Ming Lei, Guoyan Dong, and Ji Zhou. "Wideband slot-coupled dielectric resonator-based filter." Journal of Alloys and Compounds 785 (May 2019): 1264–69. http://dx.doi.org/10.1016/j.jallcom.2019.01.286.

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Ruman, Kornel, Alena Pietrikova, Pavol Galajda, Igor Vehec, Tibor Rovensky, and Martin Kmec. "A new approach to construction of extended kit for M-Sequence UWB sensor system based on LTCC." Microelectronics International 33, no. 3 (August 1, 2016): 130–35. http://dx.doi.org/10.1108/mi-03-2016-0029.

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Purpose The purpose of this paper is to introduce modified in–phase and quadrature components (I–Q) demodulator based on low temperature co-fired ceramics (LTCC) dielectric substrate GreenTape 951PX for M-Sequence ultra-wide band (UWB) sensor system. Design/methodology/approach Microstrip low pass (LP) and band pass (BP) filters for UWB sensor systems with required properties (for both filters, minimum attenuation is −40dB in stopband, bandwidth of pass band is 6 to 8.5 GHz for BP filter and cutoff frequency is 2.5 GHz for LP filter) were designed, simulated, fabricated and measured using dielectric substrates Du Pont GreenTape 951 PX. The developed microstrip filters were integrated with all parts of I–Q demodulator on one multilayer structure based on LTCC substrate Du Pont GreenTape 951 PX. Findings Both type of microstrip filters integrated in the I– Q demodulator achieved better transmission characteristics in comparison with commercial available filters. It was shown that LTCC technology based on GreenTape 951PX proves good stability in gigahertz frequency and suitability for fabrication of I–Q demodulator with a multilayer approach. Originality/value The novelty of this work lies in substituting commercially available LP and BP filters used in I– Q demodulator by microstrip LP and BP filters with better performance and furthermore the I– Q demodulator is fabricated based on LTCC instead of previously used PCB.

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Zhang, Li, Zhen Xing Yue, and Long Tu Li. "Ceramic-Polymer Composites with Low Dielectric Loss for Microwave Antennas and Wireless Sensors." Key Engineering Materials 655 (July 2015): 153–58. http://dx.doi.org/10.4028/www.scientific.net/kem.655.153.

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The low dielectric loss ceramic-polymer composites were prepared by extrusion processing technique with high density polyethylene (HDPE) as matrix and high permittivity ceramic powder in BaO-Nd2O3-TiO2(BNT) system as filter. The dielectric response in microwave frequency range was characterized, and the experimentally observed dielectric properties were compared with the theoretical models. The relative permittivity of the composites is increased from 3 to 10 with the increase in the volume fraction of BNT filter from 10 to 40 vol%. The dielectric losses of composites are less than 0.001 for all compositions. For 40 vol% ceramic loaded HDPE, the relative permittivity of 10 and loss tangent of 0.0007 at 7 GHz were obtained. The BNT-HDPE composites are promising materials for microwave dielectric antenna applications.

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Abousaif, Ehab, Aicha Elshabini, and Fred Barlow. "Waveguide Inductive Strip Filter Embedded in LTCC." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2011, CICMT (September 1, 2011): 000043–49. http://dx.doi.org/10.4071/cicmt-2011-ta21.

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Microwave filters are generally designed with microwave transmission lines. However these filters are typically lossy. The waveguide filters using conventional inductive elements such as metal rods and transverse diaphragm have some disadvantages such as complicated structure, high cost and they can be hard to mass produce. But they also have many advantages such as the capability of high power transmission, a non-radiating structure, and their thermal efficiency. A novel waveguide inductive strip filter embedded in LTCC is introduced in this paper where the disadvantages of the conventional waveguide filters are eliminated. By using LTCC technology, the cost will typically be lower, it can easily be mass produce, and these designs can also be tested easily. The equivalent T-network parameters of the inductive strip mounted in a waveguide and embedded in LTCC substrate were derived. A new iterative technique was used based on the Variation principle. The design formulas and curves of the filter were presented. The design method of the filter was derived by applying the equivalent network of the inductive strip to the usual method of the filter design. A complete set of new curves relating the various filter parameters were introduced. Similar curves can be derived to design similar filters for any frequency band using any dielectric material. Three-dimensional electromagnetic field modeling and simulation was carried out using HFSS (High Frequency Structure Simulator). An optimization process was done for the designed filter. The modeling and the optimization S-parameters curves are shown. This paper introduces a new methodology of designing waveguide inductive strip filters embedded in LTCC. The design methodology was derived and presented with formulas and curves. The design steps are explained and verified by examples and results.

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Peng, Yu Feng, Shu Li Zhang, Yao Hui Li, Yue Zhao, and Si Hong Lin. "Study on Transmission Characteristics of Silicon-Based Microstrip Bandpass Filter." Advanced Materials Research 317-319 (August 2011): 1187–90. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.1187.

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With the development of semiconductor process technology and IC design technology, silicon-based filter technology continuously improved. The filter’s transmission characteristics depend on the dielectric constant, dielectric loss and substrate thickness. This paper studies the frequency response characteristics of transmission coefficient and reflection coefficient of the parallel coupled microstrip bandpass filter, in the condition of silicon-based with different thickness, loss and doped concentration, when the center frequency is 5.75 GHz.

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Yuan, Xiao-Xiao, Li-Heng Zhou, and Jian-Xin Chen. "A multilayer substrate integrated filter using dual dielectric modes." International Journal of Microwave and Wireless Technologies 11, no. 08 (May 8, 2019): 787–91. http://dx.doi.org/10.1017/s1759078719000527.

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AbstractIn this paper, a novel multilayer substrate integrated dual-mode dielectric resonator (DR) filter is proposed. The square dual-mode DR is made of the high permittivity substrate by removing the undesired portions and the surface coppers so that the relatively high unloaded quality factor of the dominate TM11 pair can be obtained which compared to these fully dielectric-filled substrate integrated waveguides. Meanwhile, it can be easily integrated in an equivalent cavity implemented by multilayer printed circuit boards for filter design, showcasing low in-band loss, light weight, and compact size. For demonstration, a multilayer substrate integrated DR bandpass filter centered at X-band is designed and measured. Good agreement between the simulated and measured results can be observed, and the measured insertion loss at the passband center frequency (8.38 GHz) is 1.1 dB.

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Zhang, Hao, Wei Kang, and Wen Wu. "Low Phase Noise Feedback Oscillators Utilizing High-Q SIW Filter with Dielectric Loading." Frequenz 73, no. 1-2 (January 28, 2019): 1–6. http://dx.doi.org/10.1515/freq-2018-0070.

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Abstract High-Q substrate integrated waveguide (SIW) resonator and its application to low phase noise oscillators are focused in this paper. By drilling air holes in the substrate, SIW bandpass filters (BPFs) with high Q factor could be achieved. This SIW filter is embedded into the feedback loop to be treated as a frequency stabilization element in designing the oscillator. The complex quality factor (Qsc)-peak frequency of the filter is chosen as the final oscillation frequency to obtain low phase noise performance. Moreover, air boxes are utilized instead of the air holes in the substrate to design another oscillator with lower phase noise performance and good harmonic suppression. Two low phase noise oscillators based on fourth-order SIW BPFs with dielectric loading have been studied, demonstrated and fabricated to verify the design concept.

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Journal articles on the topic 'Dielectric filter'

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