서지주요정보
1-Tesla 자기공명영상 시스템용 마이크로스트립 Quad-Coupler 및 PIN-다이오드 스위치의 설계 및 제작 = Design and implementation of microstrip quad-coupler and PIN-Diode switch for the 1-Tesla MRI system
서명 / 저자 1-Tesla 자기공명영상 시스템용 마이크로스트립 Quad-Coupler 및 PIN-다이오드 스위치의 설계 및 제작 = Design and implementation of microstrip quad-coupler and PIN-Diode switch for the 1-Tesla MRI system / 류웅환.
저자명 류웅환 ; Ryu, Woong-Hwan
발행사항 [서울 : 한국과학기술원, 1997].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8007721

소장위치/청구기호

학술문화관(문화관) 보존서고

MEE 97010

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

It is now common practice to utilize the quadrature RF coils to improve the signal -to-noise ratio (SNR). In addition, to draw such an available SNR improvement, it is mandatory to use a well designed quadrature coupler which facilitates a perfect 3dB coupling and quadrature-phase shift. However, the four ports matching condition has to be well considered during the RF excitation and the signal detection period. This work investigates the effects of such a mis-matching condition from the simulation and real implementation and derives the possible measure to minimize the resultant signal loss. It not only has accurate quadrature but currently has not more than -22dB reflection loss and more than 25dB decoupling between two RF coil systems. Which is more, using quarter lambda technique, it has more than 80dB isolation between Tx and Rx port during Transmit/Receive switching. As a result, the SNR of our system increases 3dB to be compared with the old one. Considering power loss and reduction of size, we used RT/duroid 6010 substrate and for simulation we used compact software. It will be a solution to the concern of getting nonmagnetic, high power and high Q spare parts when using higher frequency in its future. Since it can also be easily reproduced and reduced in sizes, it will be more widely used.

서지기타정보

서지기타정보
청구기호 {MEE 97010
형태사항 iii, 69 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 수록
저자명의 영문표기 : Woong-Hwan Ryu
지도교수의 한글표기 : 이황수
공동교수의 한글표기 : 박현욱
지도교수의 영문표기 : Hwang-Soo Lee
공동교수의 영문표기 : Hyun-Wook Park
학위논문 학위논문(석사) - 한국과학기술원 : 전기및전자공학과,
서지주기 참고문헌 : p. 60-61
주제 브랜치라인 커플러
핀-다이오드 스위치
자기공명영상 시스템의 초단
MRI front-end
Quad-coupler
PIN-diode switch
Branchline coupler
QR CODE qr code