Piezoelectric boundary acoustic waves: Their underlying physics and applications

Ken Ya Hashimoto, Yiliu Wang, Tatsuya Omori, Masatsune Yamaguchi, Michio Kadota, Hajime Kando, Teruhisa Shibahara

Research output: Contribution to journalConference articlepeer-review

11 Citations (Scopus)


This paper reviews physical properties of piezoelectric boundary acoustic waves (PBAWs) and their application to miniature and high performance RF filters. First, basic properties of PBAWs are discussed. It is shown that PBAWs are supported in various structures provided that highly piezoelectric material(s) are employed as structural member(s). For example, PBAWs are trapped near the electrode region in the SiO2/heavy grating electrode/rot. YX-LN structure. This means that PBAW properties in the structure are independent of the SiO2 layer thickness. This is a significant advantage for mass production. Rot. YX-LN possesses piezoelectric coupling with the Rayleigh-type PBAW as well as the SH-type one. It is shown that the coupling can be negligible when the is properly designed. The PBAW devices employing SiO2/Au electrodes/0-15°YX-LN are now being mass-produced. Because of the removed cavity from the chip surface, the packaged device size can be reduced dramatically. The minimum insertion loss achieved is comparable to that of conventional SAW filters in a relatively large device size. The SiO2 layer is effective in achieving the improved temperature coefficient of frequency.

Original languageEnglish
Article number4803167
Pages (from-to)999-1005
Number of pages7
JournalProceedings - IEEE Ultrasonics Symposium
Publication statusPublished - 2008 Dec 1
Event2008 IEEE International Ultrasonics Symposium, IUS 2008 - Beijing, China
Duration: 2008 Nov 22008 Nov 5

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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