Low loss and high rejection RF SAW filter using improved design techniques

Yuji Fujita, Takashi Shiba, Seima Kondo, Naoki Matsuura, Mitsutaka Hikita, Seiichi Ogawa

Research output: Contribution to journalConference articlepeer-review


A new high-performance surface acoustic wave (SAW) filter for cordless phone is presented in this paper. The transition characteristics are strongly dependent on a transducer structure and a film thickness owing to the effects of the bulk wave and the electro-mechanical coupling. Similarly the sidelobe characteristics depend on a wire-bonding and an electrode patterning because of the electromagnetic feed through effect. We have simulated and designed with consideration of the bulk wave and the feed through effects using the improved equivalent circuit model. Consequently we have developed a 3 mm square SMD SAW filter with 2.4 dB loss, 5.4 MHz transition bandwidth and over 65 dB sidelobe rejection for 900 MHz ISM band cordless phone systems. The experimental results are in good agreement with the simulations.

Original languageEnglish
Pages (from-to)399-402
Number of pages4
JournalProceedings of the IEEE Ultrasonics Symposium
Publication statusPublished - 1998 Dec 1
Externally publishedYes
EventProceedings of the 1998 International Ultrasonics Symposium - Sendai, Miyagi, Jpn
Duration: 1998 Oct 51998 Oct 8

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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