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접지 접촉 문제가 없는 새로운 DGS 비대칭 브랜치 라인 하이브리드 결합기
林鍾植(Jongsik Lim),車顯源(Hyeonwon Cha),鄭龍采(Yongchae Jeong),朴雄熙(Ung-Hee Park),安達(Dal Ahn) 대한전기학회 2008 전기학회논문지 Vol.57 No.8
A 10 ㏈ branch Line hybrid coupler included with defected ground structure (DGS) is proposed. In this contribution, a contact between the grounded metal housing and DGS is avoided, which has been a serious problem in applying DGS to high frequency circuits. An isolation between the metal housing and the DGS pattern is provided by inserting additional substrate between DGS and the metal package. Therefore, it is possible to design branch line hybrid couplers having highly asymmetric power dividing ratio using these DGS structure, which is demonstrated in this paper. The designed and fabricated branch line hybrid coupler using DGS is well packaged in a metal housing without touching the ground metal directly. The measurement is performed under realistic practical operating situations because it is packaged in a metal housing. The measured performances of the fabricated 10㏈ coupler shows a 1:9 asymmetric power dividing ratio at output ports, as predicted. In addition, the measured performances in terms of matching, isolation, and phase difference are in excellent agreement with the simulated characteristics.
DGS 전송선로의 등가회로와 전파지연계수에 대한 재고찰
林鍾植(Jongsik Lim),具滋慶(Jakyung Koo),韓相敏(Sang-Min Han),鄭龍采(Yongchae Jeong),安達(Dal Ahn) 대한전기학회 2008 전기학회논문지 Vol.57 No.11
A frequency-dependent slow-wave factor (SWF) and equivalent circuit model of transmission line with defected ground structures (DGS) is described. Once S-parameters of a DGS transmission line are given, the conventional frequency-independent equivalent circuit elements are extracted using 3㏈ cutoff and resonant frequencies (Fc and Fo) as the first step. Using the initial equivalent elements and simple transmission line theories, a frequency-dependent equivalent transmission line model is established through an analytical method, and finally the frequency-dependent SWF is calculated. The proposed equivalent circuit model and SWF are frequency-dependent and more reliable because even small insertion loss within available passband is considered, while they have been independent of frequency.