The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Perfectly-Matched DC Blocks Terminated in Arbitrary Impedances

임의의 종단 임피던스를 갖는 DC Block의 완전 정합

  • Ahn, Hee-Ran (Dept. of Electronics and Electrical Engineering, Pohang University of Science and Technology(POSTECH)) ;
  • Kim, Bum-Man (Dept. of Electronics and Electrical Engineering, Pohang University of Science and Technology(POSTECH))
  • 안희란 (포항공과대학교 전자전기공학과) ;
  • 김범만 (포항공과대학교 전자전기공학과)
  • Published : 2007.08.31
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Abstract

Design equations of DC blocks terminated in arbitrary impedances are newly suggested and a microstrip DC block is tested for the perfect matching. The DC block is a two-port passive component and the power excited at a port is transmitted into another port. However, all the excited power at the input can not be delivered to the output and therefore most of the conventional DC blocks can not be perfectly matched with arbitrary termination impedances. To solve the matching problem, its one-port equivalent resonant circuit model, front which design equations can be derived, is newly suggested. Using the derived design equations, any DC block can be designed, perfectly matched without any restriction of coupling coefficients. To verify the derived design equations, measurements were carried out and the results are in good agreement with prediction, showing insertion and return losses at 4.1 GHz are 0.82dB and -31dB, respectively.

임의의 종단 임피던스를 갖는 DC block을 정합하기 위한 새로운 설계식이 소개되었으며, 이 설계식을 이용한 microstrip DC block이 제작, 측정되었다. 기존의 DC block은 완전히 정합기지 않았기 때문에, 한 단자에서 여기 된 power가 다른 단자로 모두 전달되지 않는 문제점이 있었다, 이런 문제점을 해결하기 위하여, 한 단자의 등가 공진기 회로를 제시하였으며, 이 등가회로를 이용하여, coupling coefficient에 관계없이, 어느 경우에도 완전 정합을 이룰 수 있는 설계식을 유도했다. 이 설계식을 이용하여 측정된 microstrip DC block의 삽입, 반사 손실은 중심 주파수 4.1 GHz에서 0.82dB, -31dB를 보였으며, 이 측정 결과는 예상된 결과와 잘 일치함을 보여주고 있다.

Keywords

References

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