• Title, Summary, Keyword: Stepped-impedance resonator (SIR)

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A Novel Design Method of Microstrip Dual-Band Filter Using PI-SIR and OLRR (PI-SIR과 OLRR을 이용한 마이크로스트립 이중 대역 여파기의 설계 방법)

  • Lim, Ji-Eun;Lee, Jea-Hyun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.2
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    • pp.245-251
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    • 2011
  • In this paper, dual-band bandpass filter by using Pseudo-Interdigital Stepped-Impedance Resonator(PI-SIR) and Open-Loop Ring Resonator(OLRR) is proposed. The first passband and second passband are formed by PI-SIR and the second passband is reinforced by an OLRR. In a PI-SIR the first band and second band are easily and exactly adjusted by characteristic impedance ratio and electrical length ratio. The proposed design method may be confirmed to be useful from fabricated and measured results for dual-band bandpass filter operated at 2.45 GHz and 5.8 GHz.

Tri-band Microstrip Bandpass Filter Using Dual-Mode Stepped-Impedance Resonator

  • Liu, Haiwen;Lei, Jiuhuai;Zhao, Yulong;Xu, Wenyuan;Fan, Yichao;Wu, Tiantian
    • ETRI Journal
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    • v.35 no.2
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    • pp.344-347
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    • 2013
  • This letter presents a compact dual-mode tri-band bandpass filter by using a short-circuited stub-loaded stepped-impedance resonator (SIR) and a short-circuited stub-loaded uniform impedance resonator. Also, a hairpin SIR geometry is introduced to miniature the size of this filter while maintaining excellent performance. The use of a short-circuited stub at the central point of the hairpin SIR can generate two resonant modes in two passbands. Its equivalent circuit structure is analyzed by using the even-odd mode theory. For demonstration purposes, a tri-band filter for the applications of the Global Positioning System at 1.57 GHz, Worldwide Interoperability for Microwave Access at 3.5 GHz, and wireless local area networks at 5.2 GHz is designed, fabricated, and measured.

Spurious Suppressed Substrate Integrated Waveguide Bandpass Filter Using Stepped-Impedance Resonator

  • Lee, Il-Woo;Nam, Hee;Yun, Tae-Soon;Lee, Jong-Chul
    • Journal of electromagnetic engineering and science
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    • v.10 no.1
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    • pp.1-5
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    • 2010
  • A spurious suppressed bandpass filter is proposed and discussed using the stepped impedance resonator(SIR) on a substrate-integrated waveguide(SIW) structure with a double-layer substrate. The second resonance of the fundamental $TE_{10}$ mode can be controlled by adjusting the electrical length and impedance ratio of each SIR. The spurious suppressed SIW bandpass filter shows the measurement results of the insertion loss of 3.98 dB and return loss of less than 11.58 dB at the center frequency of 12 GHz. Also, the second spurious frequency is improved to about $1.5f_0$ compared with $1.33f_0$.

Design of SIR-based Bandstop Filter with Symmetrical Hairpin Wideband (SIR 기반 대칭 헤어핀 광대역 대역저지 여파기)

  • Kim, Chang-Soon;Lee, Yong-IL
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.18 no.1
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    • pp.43-46
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    • 2018
  • This paper has designed a wideband bandpass filter (WBSF : Wide Band Stop Filter) using a stepped impedance resonator (SIR : Stepped Impedance Resonator) with improved performance and improved hairpin coupling structure. The SIR WBSF is small in size and has the advantage of having excellent bandstop characteristics. The designed BSF has a structure in which a quadrangular shaped hairpin of a / 4 length is arranged symmetrically on the upper and lower sides of the input and output transmission lines. The input and output terminals were terminated at 50 ohms for system applications. The center frequency of the SIR WBSF is 6.3 GHz, which is the second harmonic of 3.15 GHz. The designed filter has a 3dB bandwidth of 2.9 GHz and a transmission coefficient ($S_{21}$) of 33.2 dB. The reflection coefficient ($S_{11}$) at the center frequency is 0.106 dB. The application field is used for fixed microwave relay stations, fixed satellite and earth stations, and fixed satellite communications. The overall size is $20mm{\times}10mm$.

A design of a multi-layer filter/duplexer using stepped impedance resonator (SIR 공진기를 이용한 적층형 필터/듀플렉서 설계)

  • 이종훈;김영태;강병권;정명섭;박준석;임재봉
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • pp.169-172
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    • 2002
  • In this paper, the design formulas for bandpass filters using parallel coupled stepped impedance resonators(SIR) are derived. General content about basic feature of stepped impedance resonators(SIR) is represented. The filters and duplexer using stepped impedance resonators(SIR) have been designed and realized with the presented design method at IMT-2000 frequency band Simulations have used serenade circuit simulation and HFSS EM-simulation. We were showed excellent agreements between SIR design theory and simulation results on the multi-layer filter/duplexer.

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A Design and Fabrication of Bandpass Filter using Miniaturized Square SIR (소형화된 구형 SIR을 이용한 대역통과필터 설계 및 제작)

  • Nam, Hun;Lim, Yeong-Seog
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.38 no.2
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    • pp.13-18
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    • 2001
  • In this paper, a four-pole quasi-elliptic function bandpass filter of 1.95GHz center frequency with 60 MHz bandwidth for IMT-2000 using miniaturized square SIR(Stepped Impedance Resonator) is designed and fabricated. The simulation of NUFDTD(Nonuniform Finite Difference Time Domain) is used to design the resonator and to calculate the coupling coefficient of three basic structures. The size reduction of miniaturized square SIR resonator is about more than 50% compare with a square open loop resonator. Bandpass filter using this resonator shows good microwave characteristic with the harmonic suppression of about 19dB. The results of measurements are almost similar to those of simulation.

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Design of an SIR BPF by a Novel EM Tuning of Individual Resonators (개별 공진기의 EM 조정을 통한 SIR로 구성된 대역 여파기의 설계)

  • Yang, Seong-Sik;Yeom, Kyung-Whan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.7
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    • pp.748-756
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    • 2007
  • In SIR filter, fringing capacitances and discontinuities yield a distorted frequency response from those expected by design formulas, especially in higher frequencies. In this paper, a procedure is presented in order to compensate for fringing capacitances and step impedance discontinuities by EM simulation for a 5th order SIR filter. This method propose the procedure of tuning the coupling and the length of individual resonator by EM simulation. For the filter composed by the tuned resonators, no further tuning is required. The procedure is experimentally justified by comparing the measured data of the fabricated filter with the simulation results.

Analysis of Multi-stage Stepped Impedance Resonator for Application of Multi-band Devices (다중 대역 소자 응용을 위한 다단 계단형 임피던스 공진기의 해석)

  • Yun, Tae-Soon
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.11 no.5
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    • pp.97-102
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    • 2012
  • In this paper, each electrical length and harmonics of the multi-stage SIR are calculated by using the input impedance for the variable application of SIR in the microwave systems. The size reduced ratio of the SIR is slightly reduced as increasing of the number of stage. The impedance ratio between lower and higher impedance of the SIR has the dominant effect on the size reduced ratio and harmonic characteristics. Also the equivalent impedance of the SIR is a geometric mean between lower and higher impedance and the quality factor of the SIR is similar to the half-wavelength resonator's.

A GaAs Micromachined Millimeter-wave Lowpass Filter Using Microstrip Stepped-Impedance Hairpin Resonator

  • Cho Ju-Hyun;Yun Tae-Soon;Baek Tae-Jong;Ko Baek-Seok;Shin Dong-Hoon;Lee Jong-Chul
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.3 no.2
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    • pp.85-93
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    • 2004
  • In this paper, microstrip stepped-impedance hairpin resonator (SIR) lowpass filter f.PF) by surface rnicromachining on GaAs substrate is sugsested. This filter has the advantages of compact side, easy fabrication, and sharp cutoff frequency response. The new SIR LPF shows the 3 dB passband of dc to 33 GHz, the insertion loss of 0.82 dB, and the return loss of better than 17 dB up to 25.57 GHz. This filter is useful for many microwave system applications.

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