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Effects of Coupling Capacitance on the Characteristics of Cascaded High Frequency Filter using 3rd Overtone Vibration Mode

3차 진동모드를 이용한 종속 연결된 고주파 필터 특성에 미치는 결합 캐패시턴스의 영향

  • 류주현 (세명대학교 전기공학과) ;
  • 오동언 (세명대학교 전기공학과)
  • Published : 2003.10.01

Abstract

In this paper, two filters with center frequency of 19.58MHz were cascaded and its bandwidth characteristics were investigated with the variations of coupling capacitance for intermediate frequency (IF) bandpass filter application. The cascaded filter showed the higher stop region, reduction of spurious response and increase of selectivity. With the increase of coupling capacitance, insertion loss was increased but spurious response reduced. The cascaded filter with coupling capacitance of 15pF showed insertion loss of 5.643dB, 3dB bandwidth of 55.089kHz and 20dB bandwidth of 83.608kHz, respectively.

Keywords

Cascade;Bandwidth;Intermediate frequency;SMD

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