• Title, Summary, Keyword: Microstrip Bandpass Filter

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Microstrip Bandpass Filter Using of a T-Shaped Meander Loop Resonator (Microstrip Bandpass Filter을 이용한 향상된 T-Shaped Meander Loop 공진기)

  • 정주현;오인열;나극환
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.157-160
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    • 2001
  • 본 논문에서 5.8GHz의 주파수 대역에서 사용할 수 있는 향상된 커플링 구조와 크기를 줄인 dual-mode microstrip bandpass filter를 설계하였다. 여기서 meander loop resonator를 쓰는 이유는 크기가 작고 방사 손실이 적으며 패턴이 간단하기 때문이다. 또한 이와 비슷한 특성을 갖는 ring, square patch, disk등은 불연속 성분을 가짐으로써 이중모드의 구현이 가능하다. 향상된 형태의 dual-mode microstrip bandpass filter의 변형된 T-shaped meander loop resonator를 소형으로 발전되고. 높은 선택도를 가지는 구조이다. 이 형태의 filter에서 150MHz의 bandwidth을 가지고 5.8GHz주파수를 가지는 구조로 설계하였다.

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Studies on the Microstrip Bandpass Filter Using Stepped Impedance Resonator and the Wideband Microstrip Bandpass Filter (스텝 임피던스 공진기를 이용한 마이크로스트립 대역통과 필터와 광대역 마이크로스트립 대역통과 필터에 관한 연구)

  • 박봉근;박동철
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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    • v.2 no.4
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    • pp.10-16
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    • 1991
  • A microstrip bandpass filter using stepped impedance resonators and tapped input / output is realized with Teflon substrate, whose center frequency is 3.5 GHz and fractional bandwidth is 20%. In order to realize a wider bandwidth of 30%, the Crystal's design method and the input / output tapping scheme are used. Another microstrip filter designed as mentioned above is realized with Epsilam-10 substrate. This case shows good agreement between the theoretical responses and the measured ones.

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A Highly Efficient Rectenna Using Harmonic Rejection Capability

  • Kim, Youg-Hwan;Lim, Sung-Joon
    • Journal of electromagnetic engineering and science
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    • v.11 no.4
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    • pp.257-261
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    • 2011
  • A highly efficient 2.4 GHz rectenna is designed using a harmonic rejection bandpass filter. The rectenna is printed on Rogers Duroid 5880 substrate with ${\varepsilon}_r$=2.2 and a thickness of 1.6 mm. The rectenna consists of a microstrip antenna and high order harmonic rejection bandpass filter, microstrip lowpass filter, and Schottky barrier diode (HSMS2820). The use of a $2^{nd}$ and $3^{rd}$ harmonic rejection microstrip bandpass filter in the rectenna results in high conversion efficiency. The proposed rectenna achieves a RF to DC conversion efficiency of 72.17 % when the received RF power is 63.09 mW.

Design of a Interdigital Microstrip Bandpass Filter (깍지낀 마이크로스트립 대역통과 여파기 설계)

  • 신진옥;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.565-573
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    • 2000
  • In this paper, a interdigital microstrip bandpass filter is designed. A interdigital microstrip bandpass filter has many advantages such as insertion return loss, lower return loss, higher frequency selectivity and smaller in size in comparison with the conventional coupled line filter. A interdigital microstrip bandpass filter consists of quasi TEM-mode strip line resonators between parallel ground plant. Each resonator element is a quarter wavelength long of the center frequency and is short circuited at one end and open circuited at the other end. In the filter design, Ensemble software is used. Experimental results show that the bandwidth of interdigital microstrip bandpass filter is 2.52GHz, insertion loss is -1.8dB and return loss is -17.0dB at 11.20Hz.

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Miniaturized Bandpass Filter with Improved Stopband Characteristics using planar multilayer structure (평면의 적층구조를 이용한 저지대역 특성을 향상시킨 소형화된 대역통과 필터)

  • Choi, Oh-Seog;Nam, Hun;Lim, Yeong-Seog
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.278-282
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    • 2003
  • The rapid growth of wireless and mobile communications has stimulated the development of multilayer filter technology. In this paper, one type of aperture-coupled microstrip interdigital-loop resonators in a multilayer structure are proposed and investigated for the applications to the design of a new class of compact microstrip bandpass filter. The new filter configuration consists of two arrays of microstrip interdigital-loop resonators that can be coupled through the apertures on the common ground plane. Depending on the arrangement of the apertures, different filtering characteristics can easily be realized. The results of measurement are almost similar to those of simulation.

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Cross-Coupled Microstrip Combline Bandpass Filter Using Stepped-Impedance Resonators

  • Cho, Young-Ho;Choi, Seung-Un;Yun, Sang-Won
    • Journal of electromagnetic engineering and science
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    • v.7 no.4
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    • pp.190-194
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    • 2007
  • In this paper, a cross-coupled microstrip combline bandpass filter using stepped-impedance resonators(SIRs) is proposed. In order to improve the selectivity as well as the insertion loss, the SIR configuration is used. The cross coupling is also introduced to enhance the selectivity. The improvement of the insertion loss is demonstrated not only by deriving the quality factor of the SIR but through the measured performances. Both the proposed and the conventional combline bandpass filter with 5 % of fractional bandwidth at 2 GHz were fabricated and tested. Compared to the conventional combline bandpass filter, the proposed one exhibits the improved selectivity as well as the lower insertion loss characteristics.

Design of a Microstrip Bandpass Filter Using Step Impedance Resonators and Tapped Input/Output (스텝 인피던스 공전기와 입출력 텝핑을 이용한 마이크로 스트립 대역통과 필터의 설계)

  • 박동철;박정일;이병남
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.26 no.11
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    • pp.1728-1735
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    • 1989
  • A design procedure for microstrip bandpass filters using step impedance resonators (SIR's) and tapped input/output to a conventional parallel coupled line bandpass filter is presented. The filter configuration consisting of both half-wavelength and SIR's suppreses to spurious resonance response near the second harmonics, while tapping techniques offer benefit in situations where the impractical. The measured frequency responses of the designed filter are in close agreement with the computed responses.

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Microstrip Bandpass Filter Using Stepped-Impedance Coupled-Line Hairpin Resonators with Enhanced Stopband Performance

  • Lee, Hye-Min;Ha, Jung-Hyun;Wang, Xu-Guang;Cho, Young-Ho;Yun, Sang-Won
    • Journal of electromagnetic engineering and science
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    • v.11 no.2
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    • pp.91-96
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    • 2011
  • In this paper, we propose a microstrip bandpass filter using stepped-impedance coupled-line hairpin resonators. The stepped-impedance coupled-line hairpin resonator has extended harmonic suppression in comparison with a conventional hairpin resonator due to transmission zero and the movement of harmonic frequencies resulting from the stepped-impedance characteristic. A high-pass type impedance/admittance inverter is employed in order to improve the lower frequency skirt characteristics of the passband. A 4-pole bandpass filter is designed and fabricated at 1.8 GHz. The measured results show the excellent attenuation performance at the stopband which is greater than 30 dB up to 10 GHz.

Microstrip Bandpass Filter for Spurious Resonant Mode Rejection using Metameterial Transmission Line (메타매질 전송선로를 이용한 불요 공진모드 제거용 마이크로스트립 대역통과 필터)

  • Yang, Doo-Yeong;Lee, Min-Soo
    • The Journal of the Korea Contents Association
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    • v.9 no.12
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    • pp.566-571
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    • 2009
  • In this paper, microstrip bandpass filter combined DCRLH metameterial-cells with a hairpin resonator is designed and fabricated to be transferred only fundamental passband signal, and removed a spurious resonant mode occurring when filter design using a microstrip transmission line is done. The bandpass filter is composed of CCRLH hairpin resonator and DCRLH interdigit metameterial-cells. The hairpin resonator with CCRLH property is implemented between two DCRLH interdigit metameterial-cells with DCRLH property, which is parallel to input port and output port. The interdigit metameterial-cells suppress spurious harmonics occurring on the higher order frequency and improve a filter performance. Insertion loss of the fabricated microstrip bandpass filter on the passband from 1.91GHz to 2.41GHz is 0.2dB, and attenuation on the stopband from 3GHz to 7.7GHz is bellower than -30dB. Therefore, this filter has a good performance for both mobile communications of WCDMA and wireless internet of WiBro.

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.