The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Optimization of Withdrawal Weighted SAW Ladder Filters

위드로월 가중형 SAW 사다리 필터의 최적화

  • 이영진 (대구과학대학 디지털정보통신계열) ;
  • 이승희 (경북대학교 센서공학과) ;
  • 노용래 (경북대학교 기계공학부)
  • Published : 2002.02.01
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Abstract

This paper proposes a new design algorithm to optimize the withdrawal weighted SAW ladder devices, Withdrawal weighting on SAW resonators gives enhanced bandwidth and transition band characteristics, so an optimization algorithm was developed for ladder type SAW filters. To illustrate the validity of the technique, this method was applied to the design of RF band CDMA TX SAW filters, and the design results were confirmed to show good agreement with experimental performance.

본 논문에서는 위드로월 (withdrawal) 가중형 SAW필터를 자동으로 최적화할 수 있는 설계도구의 개발 내용을 제시하였다. SAW 공진기에 위드로월 가중법이 적용될 경우, 향상된 대역폭 및 천이대역 특성을 구현할 수 있으며, 이러한 위드로월 가중효과를 이용하여 사다리형 위드로월 SAW필터의 최적화도구를 완성하였다. 본 설계방법의 유효성을 검증하기 위하여 RF 대역 CDMA용 TX 및 RX SAW 필터를 본 설계도구를 이용하여 최적화하였으며 실제 실험 결과, 이론과 매우 잘 일치함을 알 수 있었다.

Keywords

References

  1. Proc. IEEE Ultrasonics Symposium 10 GHz range extremely low-loss ladder type surface acoustic wave filter H. Odagawa;K. Yamanouchi
  2. Technical Report of IEICE Effects of parasitic circuit elements to ladder-type SAW filters K. Y. Hashimoto;M. Yamaguchi
  3. 한국음향학회지 v.21 no.1 공진기형 SAW 필터에 위드로월 가중법이 미치는 효과에 대한 이론적 연구 이영진;이승희;노용래
  4. Proc. IEEE Ultrasonics Symposium Weighting interdigital surface wave transducers by selective withdrawal of electrodes C. S. Hartmann
  5. IEEE Transactions on MTT v.23 no.11 Fundamental and harmonic-frequency circuit-model analysis of interdigital transducers with arbitrary metallization ratios and polarity sequences W. R. Smith;W. F. Fedler https://doi.org/10.1109/TMTT.1975.1128703
  6. Proc. IEEE Ultrasonics Symposium Electric field interactions within finite arrays and the design of withdrawal weighted SAW K. R. Laker;E. Cohen;A. J. Slobodnik. Jr.
  7. IEEE Transactions on Sonics and Ultrasonics v.25 no.1 Tap weight enhancement for broad-band filters D. C. Malocha;S. Datta;B. J. Hunsinger https://doi.org/10.1109/T-SU.1978.30984
  8. IEEE Transactions on UFFC v.46 no.2 Optimization of broadband withdrawal weighted interdigital transducers for high selective SAW filters E. V. Bausk https://doi.org/10.1109/58.796132
  9. Japanese Journal of Applied Physics v.40 no.8 Development of a new design technique for SAW ladder filters Y. R. Roh;Y. J. Lee;S. H. Lee https://doi.org/10.1143/JJAP.40.142
  10. IEEE Transactions on MTT v.20 no.7 Analysis and Design of Dispersive Interdigital Surface-Wave Transducers W. Smith;H. M. Gerard;W. R. Jones