• Title/Summary/Keyword: 평행 결합선로 여파기

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Design and Fabrication of Parallel Coupled Line Band Pass Filter for 5.8GHz ISM Band (5.8GHz ISM밴드용 평행 결합선로 대역통과 여파기의 설계)

  • Jang, In-Seok;Son, Tae-Ho
    • Proceedings of the KAIS Fall Conference
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    • 2006.05a
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    • pp.381-383
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    • 2006
  • 본 논문에서는 5.8Ghz ISM대역 평행 결합선로 대역통과 여파기를 설계 제작하였다. 긴본적인 설계는 저역통과 여파기에서 대역통과 여파기로 변환한 후, 직 병렬 공진기를 이용한 설계와 J-인버터를 이용해 평행 결합선로 대역통과 여파기를 구현하였다. 2개의 공진 주파수를 실제로 구현하기 어렵기 때문에 하나의 공진기만을 사용하기 위해 인버터를 사용하였다. 또한 실제적인 마이크로스트립 라인의 layout크기를 결정하기 위해 우수 기수 모드 임피던스를 해석하고 근사식을 통해 스트립라인의 치수를 결정하였다. 이런 과정을 토대로 5.8GHz ISM밴드용 평행 결합선로 대역통과 여파기를 설계, 제작하였다.

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Modified Microstrip Filters Improving the Suppression Performance of Harmonic Signals (고조파 감쇠특성을 향상시킨 변형된 마이크로스트립 여파기)

  • 김봉수;이재욱;송명선
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.13 no.10
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    • pp.1054-1060
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    • 2002
  • In this paper, a new parallel-coupled-line microstrip BPF(BandPass Filter) improving the suppression performance of 2nd harmonic signals is studied. Using the consecutive pattern in coupled-line, the desired passband performance is improved and harmonic passband signal is rejected. Recalculation of classical filter design parameters(space-gap between lines, line widths and lengths) is not required. That is, after using the classical design methodology for parellel-coupled-line BPF, new filters can be easily realized by inserting periodic patterns in coupled-line. To investigate the validity of this novel technique, order-3 Butterworth BPF centered at 2.5 GHz with a 10 % FBW(Fractional Bandwidth) and order-5 Chebyshev BPF centered at 10 GHz with a 15 % FBW were used. When five and three square grooves are used, over 30 dB harmonic suppression at 2nd harmonic is achieved in simulation and experiment.

A Equivalent Circuit for Lossless 2-Port Using Inverter and Its Application (무 손실 2-포트 회로의 인버터를 사용한 등가회로 및 응용)

  • Yang, Seong-Sik;Yeom, Kyung-Whan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.7
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    • pp.761-770
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    • 2008
  • Impedance or admittance inverter is a conceptual 2-port device frequently used in microwave filter design. In this paper, the equivalent circuit using inverter for general loss less 2-port circuit is presented. Our equivalent circuit can be directly and easily represented with z- or y-parameters compared with the conventional methods. Based on the representation, the derived results for various coupled lines such as parallel coupled line and anti-parallel coupled lines are compared ours. In addition, the results of other workers for improvement of the distortion in frequency response of microstrip coupled line filter are derived using our representation and compared. The proposed equivalent circuit shows the difference with conventional equivalent circuit so the conventional design method can not be applied to parallel coupled line filter with our representation. So in this paper the novel design method is proposed and we showed the method yields more accurate design results.

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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A Novel Design Method of Direct Coupled BPF(Band Pass Filter) Based on EM Simulation of Individual Resonator (개별 공진기의 EM 시뮬레이션에 기초한 새로운 직접결합 대역여파기 설계 방법)

  • Yang, Seong-Sik;Yeom, Kyung-Whan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.4
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    • pp.333-343
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    • 2009
  • The BPF designed by the formula based on strip line shows the center frequency shift and distortion in filter response and this becomes more significant with higher frequency. In this paper, the novel design based on EM simulation is proposed. In the design, the filter is decomposed into individual resonators and, for each resonator, the reactance slope and the inverter values are measured and tuned to desired design values for a inverter BPF prototype. The filter composed with such resonators shows the desired filter response without further tuning. This is because possible effects of discontinuities and dispersion are included in the filter parameter extraction. The method can generally apply to all filters that can be transformed into inverter BPF prototype. The procedure is verified by designing a 5th-order SIR filter and quite general to adapt into the design of a parallel coupled line filter, and hair-pin filter.

Miniaturized UHF WLAN Bandpass Filter Design for Wide Stopband Using the Metamaterial CRLH Structure (메타재질 CRLH 구조를 이용한 넓은 차단 대역을 갖는 UHF WLAN용 소형 대역통과 여파기의 설계)

  • Ju, Jeong-Ho;Kahng, Sung-Tek
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.12
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    • pp.1-7
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    • 2007
  • This paper proposes the design method based on the composite right/left-handed (CRLH) structure to miniaturize and enhance the rejection performance in the stopband. For realization, we used the 0-th order resonance point of the unbalanced case of the CRLH and the simple theory of Inverter. The proposed technique is validated by the performance predictions and experiments, and it is found out that the suggested method enables the sire reduction of over 65 % from the conventional filters such as the parallel coupled type.

Miniaturization and Rejection-Enhancement of the Bandpass Filter for the T-DMB Application Using a Metamaterial Structure of the Zero-Order Resonator Coupling (Zero-Order Resonator 결합의 Metamaterial 구조를 응용한 T-DMB 대역 통과 여파기의 소형화와 차단 대역 특성의 개선)

  • Shin, Un-Chul;Kahng, Sung-Tek
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.12
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    • pp.1462-1469
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    • 2008
  • This paper proposes the design method based on the Composite Right/Left-Handed(CRLH) structure to miniaturize and enhance the rejection performance in the stopband of the bandpass filter for a VHF band($169{\sim}211\;MHz$). For realization, we used the 0-th order resonance point of the CRLH and the simple theory of Inverter as coupling. The proposed technique is validated by the performance predictions and experiments, (Insertion loss <2 dB, $S_{11}$< -15 dB, suppression of up to the 3rd harmonic) and it is found out that the suggested method enables the size reduction of around 60 % from the conventional filters such as the parallel edge coupled type.

Suppression of Harmonic Passband of Bandpass Filters(BPFs) Using Parallel-Coupled Mushroom Structure (평행 결합 Mushroom 구조를 이용한 대역 통과 여파기의 고조파 성분 억제)

  • Lee, Jae-Gon;Lee, Jeong-Hae
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.2 s.117
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    • pp.118-125
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    • 2007
  • Harmonic band of bandpass filter(BPF) is suppressed using coupled mushroom structure. Between double positive (DPS) transmission line such as microstrip and double negative(DNG) transmission line such as one dimensional mushroom structure, strong coupling broadly arises in the cross range of dispersion curves of isolated microstrip and mushroom structure because of complex propagation constant in the cross range. Strong coupling inhibits wave propagation, so that this kind of structure can be utilized as bandstop filter(BSF). This BSF utilizes coupled transmission line instead of coupled resonator, resulting in broad bandwidth(>30 %), shan-rejection, and high rejection level. The strong coupling between DPS and DNG transmissionline makes it possible shorten coupling length, resulting in compact size. In this paper, parallel coupled BSF having center frequency of 4 GHz and 3 dB fractional bandwidth of 40 % is designed and utilized to suppressed spurious mode of two bandpass filters.

Design of the Miniaturized UWB BandPass Filter Using the 1 Unit of CRLH-TL (일단 CRLH 전송선 구조를 이용한 소형 초광대역 대역 통과 여파기의 설계)

  • Ju, Jeong-Ho;Kahng, Sung-Tek
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.18 no.12
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    • pp.1402-1407
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    • 2007
  • This paper presents a new design method of the Ultra-Wide-Band BandPass Filter using the CRLH-TL(Composite Right- and Left-Handed Transmission-line) having the Metamaterials' properties. Instead of the periodic type or many cells of the CRLH-TL, only the unit cell is used to miniaturize the target component, which can not be realized by the conventional quarter guided-wavelength resonator-based filters. Particularly, the strong coupling essential to the Ultra Wide Band is enabled by the interdigital coupled lines between the grounded stubs. The proposed design scheme is validated by the electromagnetic simulation and measurement of the fabricated filter which shows the total size of 'the guided-wavelength/9.4', the 100 % fractional bandwidth for the UWB, the insertion loss of less than 1 dB and the flat group-delay.

The Analysis of the Parallel Coupled Line with an Open Stub and Its Branch-Line Hybrid Application (개방 스터브를 갖는 평행 결합 선로의 해석과 브랜치 라인 하이브리드에의 응용)

  • Lee, Won-Kyun;Hwang, Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.1
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    • pp.40-45
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    • 2008
  • In this paper, the exact analysis of the parallel coupled line with open stub and an application to branch-line hybrid are presented. The Z-parameter of the parallel coupled line with an open stub is derived. The structure shows the characteristics as a lowpass filter unit cell(LUC) with wide stop band. Using the characteristics we designed a miniaturized branch-line hybrid with wide harmonic-suppressed band. The size of the new branch-line hybrid is a half of the conventional branch-line hybrid. The frequency response is the same with that of the conventional one near 1.7 GHz center frequency. Including the fifth harmonics, up to 12 GHz spurious responses are suppressed below to -20dB.