• Title/Summary/Keyword: Microstrip Filters

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Microstrip Slow-Wave Open-Loop Resonator Filters with Reduced Size and Improved Stopband Characteristics

  • Akkaraekthalin, Prayoot;Jantree, Jaruek
    • ETRI Journal
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    • v.28 no.5
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    • pp.607-614
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    • 2006
  • This paper presents a new class of microstrip slow-wave open-loop resonator filters with reduced size and improved stopband characteristics. A comprehensive treatment of both ends loaded with triangular and rectangular ends is described, leading to the invention of a microstrip slow-wave open-loop resonator. Two-resonator and four-resonator bandpass filters are designed at the operating frequency of about 2 GHz, and a bandwidth of 60 MHz. The size of the slow-wave open-loop resonator is optimized from the standpoint of the unloaded Q-factor. The filters are not only compact in size due to the slow-wave effect, but also have a wider upper stopband resulting from the dispersion effect. The filter designs of this type are described in details. The experimental results are demonstrated and discussed.

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Design of Elliptic Filters Using Rectangular Microstrip Elements (구형 마이크로스트립 소자를 이용한 이립틱 여파기의 설계)

  • Jang, Weon-Ho;Lee, Yun-Hyun
    • Proceedings of the KIEE Conference
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    • 1987.07a
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    • pp.110-114
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    • 1987
  • A method for synthesizing low-pass elliptic filters in a microstrip configuration is presented. The realization consists of the cascade connection of proper rectangular elements, each one corresponding to four reactive elements of the lumped-constant prototype. This allows an effictive control of parasitics and unwanted reactances. Which results in the possibility of realizing higher order filters with cutoff frequencies UP to X-band. Fifth and seventh order filters were fabricated on allumina substrates.

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Koch Fractal Shape Microstrip Bandpass Filters on High Resistivity Silicon for the Suppression of the 2nd Harmonic

  • Kim, Ii-Kwon;Kingsley Nickolas;Morton Matthew A.;Pinel Stephane;Papapolymerou John;Tentzeris Manos M.;Laskar Joy;Yook, Jong-Gwan
    • Journal of electromagnetic engineering and science
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    • v.6 no.4
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    • pp.235-243
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    • 2006
  • In this paper, the fractal shape is applied to microstrip band pass filters and integrated on a high-resistivity Si substrate to solve conventional $2^{nd}$ harmonic problem. Conventional microstrip coupled line filters are popular in RF front ends, because they can be easily fabricated and integrated with other RF components. However, they typically have large second harmonics that can cause unwanted interference in interested frequency bands. Without any additional filters, the proposed Koch shape filters have suppressed the $2^{nd}$ harmonics by about -40 dB, so they can be used in systems such as direct conversion receiver with stringent harmonic suppression requirements.

Fabrication of Microstrip Band-Pass Filter using HTS Thin Film (고온초전도 박막을 이용한 마이크로스트립 대역통과 필터의 제작)

  • 허원일;정동철;김민기;임성훈;한병성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1996.11a
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    • pp.389-392
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    • 1996
  • The recent development of high temperature superconducting epitaxial thin film offer great potential for planar passive microwave application such as ring resonator, filters, transmission lines, and antennas. This paper describes the fundamental properties of Microstrip Band-Pass Filter using HTS Thin Film and its application to microwave devices. In order to fabricate HTS microstrip multiple filters, We have grown laser ablated HTS thin films, patterned by photolithographic process and wet etching processes intro HTS microwave devices.

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Design of Microstrip Band-Pass filters Using Cross-Coupled Hairpin Resonators (교차결합 헤어핀 공진기를 이용한 마이크로스트립 대역통과 여파기 설계)

  • 오창근;전성근;이문수
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.4 no.3
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    • pp.557-564
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    • 2000
  • A microstrip band-pass filter using cross-coupled resonators is designed and studied experimentally. The cross-coupled microstrip hairpin resonator filters exhibit ripples in both passband and stopband. These ripples can improve both frequency selectivity and insertion loss. The cross-coupled filters are not only simple and compact in configuration, but also have great flexibility to form filters into a variety of size. In this paper, a microstrip band-pass filter using cross-coupled resonators is designed at the center frequency of 1.8GHz with bandwidth of 5.0% using Ensemble software. The experimental results show that the bandwidth is about 4.53% at 1.8GHz.

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Temperature Dependence of Microwave Properties of HTS Multipole Lowpass Filters Consisting of Microstrip Open-Stub Lines

  • Kim, Je-Ha;Han, Seok-Kil;Kang, Kwnag-Yong;Ahn, Dal
    • ETRI Journal
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    • v.19 no.2
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    • pp.48-58
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    • 1997
  • Using high quality high-$T_c$ superconducting (HTS) YBCO thin films, we designed and fabricated 3-pole, 5-pole, and 7-pole lowpass filters consisting of microstrip transmission lines and open-stub lines. We measured the microwave response of the filters in the temperature range of T=85 K to 27 K. AtT=30 K, the observed inband insertion loss was 0.14dB and 0.02dB for the 5-pole and 7-pole filters, respectively. The cut-off frequency was 4.7 GHz for the 5-pole filter and 7.9GHz for the 7-pole filter. To the authors' knowledge, the measured inband insertion losses are the best values reported so far for the open-stub line type HTS multipole lowpass filters. The skirt property of the 5-pole filter showed a large improvement over that of the 3-pole filter as predicted from the simulation. We found that, to obtain a stable performance, the HTS multipole lowpass filters should be operated at the temperatures between 60% and 70% of $T_c$.

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Miniatured Planar Bandpass Filter Using Coupled Metamaterial Resonators

  • Kim, Gi-Rae
    • Journal of information and communication convergence engineering
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    • v.9 no.3
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    • pp.256-259
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    • 2011
  • In this article, new microstrip slow-wave bandpass filters using open loop resonator loaded with inter-digital capacitive fingers is proposed. The filter features not only compact in size, but also exhibits spurious stop-band rejection. Filters of this type with elliptic function and Chebyshev response are demonstrated. There is good agreement between experimental and full-wave electromagnetic (EM) simulation results.

Design of Coupled Resonators Bandpass Filter with Defected Ground Structure

  • Kim, Gi-Rae
    • Journal of information and communication convergence engineering
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    • v.9 no.2
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    • pp.150-154
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    • 2011
  • In this paper a four-pole elliptic function bandpass filter is designed with two ground slots. A research of microstrip bandpass filters (BPF) using defected ground structures (DGS) is presented. DGS technique allows designs of tight couplings without the necessity of using very narrow coupling gaps. The simulator Sonnet is used to design the resonator and to calculate the coupling coefficient of the basic coupling structure. Compared to similar microstrip filters without defected ground structure, the simulated performances of these novel structures indicate some technological advantages.

Design of Wide Band VHF Microstrip Tunable Band-Pass Filters (광대역 VHF 마이크로스트립 가변대역통과 여파기의 설계)

  • 박병호;정용채;윤상원;장익수
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.29A no.10
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    • pp.24-28
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    • 1992
  • A new design method of microstrip wide band VHF tunable bandpass filters using varacter diodes is presented. In the proposed filter both the input and output ports are coupled through capacitors, and an open micro-strip line is inserted between the coupled line in order to obtain the desired degree of coupling. The optimized filter responseses for the frequency range of 220-404MHz by TOUCH-STONE are compared with the measured ones.

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Design of Cascaded Lowpass Filter using Combination of Stopbands (저지대역의 중첩을 이용한 캐스캐이드 저역통과 여파기의 설계)

  • 김경훈;김상인;박익모;임한조
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.15 no.7
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    • pp.644-652
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    • 2004
  • In this paper, we designed a cascaded microstrip lowpass filter using the lowpass filters previously proposed. The previously proposed lowpass filters have a ultra-wide stopband and prominent cutoff sharpness using the combined characteristics of slot and microstrip open stub, respectively, and they are catagorized into 2 types by the method that determining their passband characteristics. The first type is determined its passband characteristics by open stub characteristics and the second is by slot characteristics. By cascading these structures with impedance adjustment of each element, the deeper out-of-band rejection and the sharper skirt response were achieved. The fabricated cascaded lowpass filters have -3㏈ cutoff frequencies at 1.035㎓ and 1.286㎓ respectively and -20㏈ stopband is over 20㎓ for both structures.