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崔忠衍 木浦海洋大學校 1996 論文集 Vol.4 No.1
The type and technique of radio equipment should be standardization for the operation of efficient intercommunications on the basis of worldwide. For the fulfillment of above purpose, each member of ITU is enforcing official approval system of radio equipment based on the regulations of the technical standard prescribed by the ITU in accordance with each national present circumstances. This paper studied the regulations on the approval of type and the confirmation certification of technical standard of the radio equipment in force in Korea.
崔忠衍 木浦海洋大學校 1993 論文集 Vol.1 No.1
nowadays, news electronic apparatus relating to citizen living is appearing almost everyday in accordance with the development of science and technology in connection with radio waves. Accordingly, there is a necessity for revising of the Radio Waves Act in order to facilitate the use by a citizen of them for the promotion of public welfare, and this paper studied on the contents and the propriety about the radio station licence of the revised Radio Waves Act.
박천관,최충연 木浦海洋大學校 2000 論文集 Vol.8 No.1
Single slot assignment protocol has the advantage that can reserve one slot of uplink autonomously. But it has the disadvantage that each terminal must scan the whole slots of downlink, and all terminals can receive the data only through broadcasting because it is impossible to assign slot to send the information from base station to terminal. Therefore it is impossible to send the data to particular terminal, and slot should have been reserved in the case of sending the data to downlink. This paper has addressed the performance of multiple slot assignment protocol that solved problems of single slot assignment protocol.
김갑기,최충연,김철수,Kim Kab-ki,Choi Chung-yun,Kim Chol-soo 한국정보통신학회 2004 한국정보통신학회논문지 Vol.8 No.7
본 논문에서는 근거리무선 통신용 RF 모듈을 구성하는 핵심 부품인 5.5GHz 대역 LNA와 마이크로스트립 패치 안테나를 설계하였다. LNA는 NEC사의 NE3210S01를 사용하여 잡음특성을 개선하였으며 마이크로 스트립 패치 안테나는 전방향성을 갖도록 설계하였다. 제작된 LNA는 이득이 약15dB, 입출력 반사손실이 -20 dB 이하이며, VSWR은 1.5를 넘지 않는 특성을 보였다. 단일패치 안테나는 입력 반사 손실이 -28 dB이며, VSWR은 1.2 이하의 우수한 특성을 나타내었다. This paper shows the design of Active antenna which appled to 5.5GHz RF module for local wireless communication system. The LNA, which was designed Super low noise HJ FET of NE3210S01, is used to obtain a good noise figure characteristics. And the microstrip patch antenna was designed to obtain omnidirectional antenna characteristics. The measured LNA gain is 15 dB, input & output return loss is under -20 dB and VSWR under 1.5. The Single microstrip patch antenna input return loss is under -29 45, VSWR under 1.2.
Filtering Properties of Metal-Strip Gratings for Optical Communication
Park, Chun-Kwan,Choi, Chung-yun 木浦海洋大學校 2001 論文集 Vol.9 No.2
The electromagnetic properties of leaky-waves guided by metal-strip grating configurations can be phrased in rigorous modal theory. Such a modal solution expressed by simple electrical transmission-line networks is utilized to analyze the leakage and filtering characteristics of metal-strip gratings. In particular, the modal transmission-line theory can serve as a template for computational algorithms that systematically evaluate the radiation effects that are not readily obtained by other methods.
김갑기,박용식,최충연,최병하 한국전자파학회 2000 한국전자파학회논문지 Vol.11 No.8
본 논문에서는 Anti-Parallel 다이오드를 이용한 서브하모닉 링 혼합기를 설계 연구하였다. 기존의 혼합기는 LO신호와 RF신호를 혼합하여 LO와 RF의 차로 IF신호를 얻는다. APDP(Anti-Parallel Diode Pair)를 이용한 서브하모닉 링 혼합기는 RF신호와 LO의 제 2고조파 성분과 혼합하므로 기존의 혼합기보다 LO의 주파수가 1/2로 줄어드는 장점이 있다. 제작한 서브하모닉 링혼합기의 변환손실은 12.6 ㏈이고, 1 ㏈ 압축점은 0 ㏈m이다. Lo/If, Lo/RF의 분리도 특성은 24.6 ㏈, 22.5 ㏈이고, RF/LO, LO/RF의 분리도 특성은 32.6 ㏈, 22.5 ㏈를 보인다. In this paper, Sub Harmonic Ring Mixer using Anti-Parallel Diode Pair is studied. Conventional mixers mix LO signal with RF signal and, obtain IF signal from the difference between LO and RF. Sub harmonic ring mixers using APDP mix RF signal with the second harmonic of LO signal, LO frequency needed for conventional receiver is reduced by 1/2.The produced mixer showed 12 dB conversion loss, and 1 dB compression point of IF signal, in respect to RF signal, was found at the 0 dBm RF signal. Isolation LO/IF and LO/RF is 24.6 dB and 22.5 dB respectively. Isolation RF/LO and LO/RF is 32.6 dB and 22.5 dB respectively.