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林廣植(Kwang-Sik Lim),李鍾範(Jong-Beom Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.2
This paper describes the effect of transient state in underground transmission and distribution lines installed together in the same tunnel. Two systems installed in the same tunnel are operated by the common grounding. This paper analyzed that how much one of the two kinds of systems influences the other systems during the transient state by EMTP/ATPDraw. Single line-to-ground fault and lightning surge were selected in transient state condition. These cases were simulated variously according to the variation of common grounding magnitude, fault location and lightning surge magnitude. It is evaluated that the analyzed results will be used for establishment and operating materials of common grounding in the same tunnel.
고출력 트랜지스터 패키지 설계를 위한 새로운 와이어 본딩 방식
林鍾植(Jongsik Lim),吳星?(Seongmin Oh),朴天仙(Chunseon Park),李龍鎬(Yongho Lee),安達(Dal Ahn) 대한전기학회 2008 전기학회논문지 Vol.57 No.4
This paper describes the design of high power transistor packages using high power chip transistor dies, chip capacitors and a new wire bonding technique. Input impedance variation and output power performances according to wire inductance and resistance for internal matching are also discussed. A multi crossing type (MCT) wire bonding technique is proposed to replace the conventional stepping stone type (SST) wire bonding technique, and eventually to improve the output power performances of high power transistor packages. Using the proposed MCT wire bonding technique, it is possible to design high power transistor packages with highly improved output power compared to SST even the package size is kept to be the same.
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.