• Title, Summary, Keyword: SIR : Stepped Impedance Resonators

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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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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 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.

The Implementation of UWB Bandpass Filter using SIR(Stepped Impedance Resonators) Structure (SIR 구조를 이용한 초광대역 대역 통과 여파기의 설계)

  • Shin, Seung-Ha;Choi, Chang-Ho;Jun, Kye-Suk
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.12A
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    • pp.1214-1218
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    • 2010
  • A new compact UWB bandpass filter with sharp-rejection and low insertion-loss is designed in this paper, using the parallel transmission line with SIR structure. An Example filter is firstly theoretically designed by the proposed synthesis procedure, the optimized by EM simulator, fabricated in microstrip line and finally characterized by a network analyzer. A good agreement between the simulation results and prototype validates the proposed UWB bandpass filter. The designed filter also realized a sharp rejection of higher order with a relatively small size which is proper for the UWB communication system.

Tunable Combline Bandpass Filter Using Cross-Coupled Stepped-Impedance Resonators with Enhanced Characteristics

  • Kim, Yoon-Hong;Cho, Young-Ho;Yun, Sang-Won
    • Journal of electromagnetic engineering and science
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    • v.8 no.4
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    • pp.144-147
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    • 2008
  • This paper proposes a tunable combline bandpass filter with high selectivity, constant bandwidth, and good stopband performances. A filter with these characteristics is obtained by applying cross-coupling to the conventional combline bandpass filter using stepped-impedance resonators(SIRs). For high selectivity and constant bandwidth, cross-coupling is utilized and the SIR configuration is used for enhanced stopband performances. The proposed combline tunable bandpass filter with 5% of fractional bandwidth at 1.6 GHz was fabricated and tested. The measured results showed 11.6% tunability with constant bandwidth, high selectivity and enhanced stopband characteristics.

Fabrication of Microstrip Stacked-SIR Bandpass Filter with DGS (DGS 구조를 갖는 마이크로스트립 다단 SIR 대역통과 여파기의 제작)

  • 고동성;마태진;김정근
    • Proceedings of the IEEK Conference
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    • pp.331-334
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    • 2003
  • This letter presents the design and measured performance of bandpass filters based on a stacked-SIR (stepped impedance resonators) configuration with DGS (Defected Ground Structure). An unit DGS configuration is designed and analyzed to show the phase characteristic of proposed slow-wave structure. The SIR filter with DGS has been yielded better stop band and sharper skirt behavior than conventional bandpass filter.

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Fabrication & Characteristics of SIR Microsrip Bandpass Filters using Deposition of High-Tc Superconducting Epitaxial Films (고온 초전도 에피텍셜 박막을 이용한 SIR 마이크로스트립 대역통과 필터의 제작 및 특성연구)

  • Park, Kyung-Kuk;Chung, Dong-Chul;Jeong, Yong-Chae;Lim, Sung-Hun;Yim, Seong-Woo;Han, Byoung-Sung
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.5
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    • pp.326-332
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    • 1999
  • In this paper, we designed and fabricated High-Tc Superconducting (HTS) microstrip bandpass filters using Stepped Impedance Resonators(SIR) and studied on their characteristics. The $high-T_c$ superconducting $Y_1Ba_2Cu_3O_{7-x}$ epitaxial films were deposited by Pulse Laser Deposition (PLD) system on MgO. The fabricated filters were designed so as to operate in Ku band with central frequency 17.25 GHz, bandwidth 2.896% and ripple 0.01 dB. These filters were composed of parallel coupled microstrip SIR of which impedance ratio (K) are 0.5, 1.5. In the measured response, HTS filters had showed insertion loss below -0.5 dB. For comparison with normal conducting filter, we fabricated the Au counterpart that consists of the resonators as K=1.5 in the same dimension and measured performance of the Au filter. In comparison, HTS filter designed optimally got superior response to gold conterpart.

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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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A Microstrip Dual-Band Band-Pass Filter Using Feed Lines and Resonators with SIR Structures (SIR 구조의 피드 라인과 공진기를 이용한 마이크로스트립 이중대역 대역통과 여파기)

  • Lim, Ji-Eun;Lee, Jae-Hyun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.26 no.5
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    • pp.463-470
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    • 2015
  • In this paper, a new dual-band bandpass filter(BPF) that has resonators and feed lines with Stepped-Impedance Resonator(SIR) structures is proposed. Feed lines with SIR structure provide maximum magnetic field points which occur at the same locations of the input and output feed lines, so the insertion loss of BPF was reduced. Applying the SIR structure to the BPF for the first passband improves rejection characteristics between the first passband and the second passband. It reduces the coupling between the BPF for the first passband and the BPF for the second passband, so it makes the dual-band BPF more compact. The proposed design method provides independent changes of both the center frequency and the bandwidth for each resonator, and also improves filtering characteristics. The validity of the proposed design method is confirmed by comparisons between the designed parameters and the measured results satisfying WLAN specifications.

The Design of 2.4 GHz Band LTCC Bandpass Filter using $\lambda$/4 Hairpin Resonators ($\lambda$/4 Hairpin 공진기를 이용한 2.4 GHz 대역 LTCC 대역통과 필터의 설계)

  • Sung Gyu-Je
    • Journal of the Microelectronics and Packaging Society
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    • v.11 no.4
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    • pp.7-11
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    • 2004
  • In this paper, a $\lambda$/4 hairpin resonator is applied to reduce the size of planar resonators for a 2.4 GHz Band LTCC MLC bandpass filter. The $\lambda$/4 hairpin resonator operates as stepped impedance resonator (SIR) without changing the width of the planar resonator. It is composed of two sections those are parallel coupled line and transmission line. The characteristic impedance of two sections is different each other. The design formulas of the bandpass filter using the coupling element at the arbitrary position are derived from even and odd-mode analysis. The formulas can take account of the arbitrary coupling of lumped and/or distributed resonators. The advantage of this filter is its abilities to change freely the coupling structure between two resonators. Experimental bandpass filters for 2.4 GHz Band are implemented and their performances are shown.

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