Small-sized low-loss reflector filters utilizing reflection of Bleustein-Gulyaev-Shimizu and shear horizontal waves at free edges of substrate

Michio Kadota, Junya Ago, Hideya Horiuchi, Haruo Morii

Research output: Contribution to journalConference articlepeer-review

8 Citations (Scopus)

Abstract

A Bleustein-Gulyaev-Shimizu (BGS) wave having only shear horizontal (SH) component has the characteristic of complete reflection at the free edges of a substrate with a large dielectric constant. A conventional surface acoustic wave (SAW) resonator filter requires reflectors with many electrode fingers on both sides of interdigital transducers (IDTs). It is considered that small-sized low-loss resonator filters without electrode reflectors can be realized by utilizing this edge reflection in place of the electrode reflectors in the conventional SAW resonator filter. We attempt to realize small-sized low-loss resonator filters by using this characteristic of BGS and SH waves. As a result, in spite of a wirebonded type of packages, resonator filters with very small sizes (3.8 × 3.8 × 1.5 mm and 4.5 × 5.2 × 1.75 mm) and a low insertion loss in the 52 approx. 190 MHz are realized for the spread spectrum (SS) codeless telephone system, the global system for mobile communication (GSM) system, the wide band code division multiple access system (CDMA) (Rx) system, and the narrow band CDMA (Tx) system.

Original languageEnglish
Pages (from-to)55-59
Number of pages5
JournalProceedings of the IEEE Ultrasonics Symposium
Volume1
Publication statusPublished - 1999 Dec 1
Event1999 IEEE Ultrasonics Symposium - Caesars Tahoe, NV, USA
Duration: 1999 Oct 171999 Oct 20

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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