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임종식(Jongsik Lim),권경훈(Kyunghoon Kwon),도한주(Hanjoo Do),안달(Dal Ahn) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
가유전체 기판구조와 결함접지구조를 지니는 마이크로스트립 전송선로의 전기적 길이가 증가되는 원 리를 이용하여 설계된 링 하이브리드 커플러에 대하여 기술한다. 설계된 커플러는 가유전체 기판구조 나 결함접지구조의 어느 한 가지만 있는 경우에 비하여 65.2% - 53.7%의 크기를 갖는다. 회로가 소형 화되어 설계된 이후에도 전기적인 성능은 그대로 유지됨을 보인다.
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.
임종식(Jongsik Lim),이재훈(Jaehoon Lee),이준(Jun Lee),정용채(Yongchae Jeong),한상민(Sang-Min Han),안달(Dal Ahn) 대한전기학회 2010 전기학회논문지 Vol.59 No.8
In this paper, a double lorentz composite right left handed(DL-CRLH) transmission line is designed using defected ground structure (DGS) and varactor diodes. Previously, the diode has been adopted only selectively for one of parallel or series resonators, and the balanced frequency as well as triple band frequencies were fixed. However in the proposed DL-CRLH transmission line, the balanced frequency, where the resonant frequencies of the series-connected parallel resonator and shunt-connected series resonator are the same, is adjustable. In addition, the triple band frequencies are controlled, too. The measured balanced frequency varies between 3.42∼4.8㎓ according to the controlled bias voltage. Under the same bias condition for the balanced frequency, the adjusted frequencies are 2.22∼2.77GHz, 3.7∼5.2㎓, 7.32∼8.23㎓, 3.42∼4.8㎓, and 4.44∼5.92㎓ for the conditions that βd=+0.5π, -0.5π, 2nd +0.5π, ω∞, and ωo, respectively.
기판적층형 가유전체 전송선로의 특성 임피던스 계산 방법
임종식(Jongsik Lim),구자경(Jakyung Koo),한상민(Sang-Min Han),정용채(Yongchae Jeong),안달(Dal Ahn) 대한전기학회 2009 전기학회논문지 Vol.58 No.8
This paper describes a new method for extracting characteristic impedance of transmission line using Substrate Integrated Artificial Dielectric (SIAD). The new procedure to calculate the characteristic impedance of SIAD transmission line is described with the proper equations and basic transmission line theory. The characteristic impedance is determined as an almost fixed value in the proposed method, while it fluctuates according to frequency in the previous method. As the result, the effective dielectric constant of SIAD transmission line is calculated as a fixed value rather than fluctuating one. In order to show the validity of the proposed method, SIAD microstrip lines are simulated and measured, and characteristic impedances and effective dielectric constant are calculated and compared to the previous method.