Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Implementation of 70MHz IF Filter with Slanted Finger IDTs on 123°LiNbO3 Substrates

123°LiNbO3 기판을 이용한 기울인 빗살변환기 구조의 70MHz IF 필터 구현

  • 이택주 (인하대학교 전자재료공학과) ;
  • 정덕진 (인하대학교 정보통신공학부)
  • Published : 2002.04.01
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Abstract

In this paper, surface acoustic wave(SAW) bandpass filters using slanted finger interdigital electrode transducers(IDTs) are investigated. The slanted finger IDTs are used to design SAW filters with good shape factor, a flat passband, and good out-of-band rejection characteristic. For the filter design, input-output IDT structure was simulated with modified impulse model; uniform-withdrawal weighting IDTs, withdrawal-withdrawal weighting IDTs. SAW filters of uniform-withdrawal weighting IDTs structure were designed and fabricated on $128^{\circ}LiNbO_3$ piezoelectric substrates. Implemented SAW filter has a fractional bandwidth of 30%, center frequency of 70MHz and shape factor of $1.12\pm0.01$.

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References

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