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배기 소음 저감을 위한 반사형 저정압 경량 소음기 개발
이수혁(Soo Hyuk Lee),이장현(Jang hyun Lee),김학선(Hak Sum Kim),오진우(Jin Woo Oh) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
Recently many companies make an effort to reduce noise for a civil complaint because a civil affairs is important to image of company. Coating factory of K plant is being constructed with the soundproofing measures to solve a civil complaint. In this study practical exhaust noise is measured and analyzed. The silencer is developed to satisfy on field condition. The silencer is required to have low pressure drop, lightweight and excellence reduction at 160Hz band of 1/3Octave. Types of the silencer are resonator and expansion. The result of insertion loss is 22dB at 160Hz band on KS I ISO7235 standard and 10dB overall noise level on field.
휴대폰용 FBAR Duplexer에 내장되는 위상천이기에 관한 연구
윤석출,송인상,이연승,김학선 한밭대학교 정보통신전문대학원 2004 정보통신전문대학원 논문집 Vol.2 No.1
본 논문은 WCDM용 Duplexer의 소형화를 위한 집적화된 1×lmm^(2)이하 크기의 RF Phase Shifter를 설계 하고 제작 평가하였다. 제안된 Phase Shifter는 PCB상에서 긴 마이크로스트립 라인 대신에 실리콘 기판 상에 집중 수동 소자인 high-Q 인덕터와 MIM 커패시터로 구현되었다. 제작된 Phase Shifter를 측정한 결과 삽입손실은 0.37 dB를 얻었고, 입력 VSWR은 15.69 dB를 얻었으며, 위상은 81˚를 얻었다. 크기도 0.8×O.9㎟ 로 제작되어 Phase Shifter의 소형화의 가능성을 보였다. In this paper, we have designed, and evaluated the integrated RF phase shifter to reduce the chip size below 1×1mm^(2) for WCDMA duplexer application. Instead of the large transmission lines on the PCB, the proposed phase shifter was used small-sized lumped elements, such as integrated high-Q inductor and MIM capacitors on silicon substrates. In the measurement results of the fabricated phase shifters, the insertion loss was 0.37dB and input VSWR was 15.68dB, the phase was 81˚. Also, the final chip size was 0.8×0.9㎟, which clearly showed the feasibility of the miniaturized RF LC phase shifter.