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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Analysis of Stepped Impedance Lowpass Filter with Coupled Open Stubs

개방스텁을 갖는 계단 임피던스 저역통과 필터의 해석

  • Published : 2002.12.01
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Abstract

In this paper, we have studied the dependence of insertion loss of a microstrip stepped impedance lowpass filter with coupled open stubs. Coupling mechanisms in the filter depend not only on the transmission line width of the filter but also the gap width of coupled open stubs and three attenuation poles are created with the proper conditions. Also edge capacitance between open stubs play an important role in having three attenuation Poles. We verify the results by obtaining [S] matrices.

두 스텁이 커플된 마이크로스트립 계단 임피던스 저역통과 필터의 전송선로의 폭과 edge 캐패시턴스의 변화에 따른 삽입손실 특성을 연구하였다. 이 구조에서 커플링효과는 전송선로의 폭과 스텁의 갭 간격에 의존하며 적절한 조건에서 3개의 감쇄폴이 생겨 넓은 저지대역을 가진다. 또한, 두 스텁 사이에 존재하는 edge 캐패시턴스는 3개의 감쇄폴을 가지기 위해서 중요한 역할을 한다. 이것을 [S] 파라피터를 구하여 확인했다.

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References

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