RF filter using boundary acoustic wave

Hajime Kando, Daisuke Yamamoto, Hikari Tochishita, Michio Kadota

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

In this paper, we report a new structure of a shear horizontal (SH) type boundary acoustic wave for cellular phone applications. Such a structure composed of electrodes with a low shear wave velocity between two materials, namely, the SiO2 film/Au-electrode/LiNbO3 substrate, is proposed. The ladder filter used in this paper had this structure. By changing the propagation angle of the acoustic wave, the electromechanical coupling factor k2 range from 0 to 16% was obtained, as well as a normalized bandwidth range 0.67 to 1.85 fold as large as that of a 36-46°Y-X LiTaO 3 leaky surface acoustic wave (LT-LSAW) filter. In addition, an excellent temperature coefficient of delay time (TCP = 25 ppm/°C) and a large mutual coupling coefficient κ12 (= 0.15) were also obtained.

Original languageEnglish
Pages (from-to)4651-4654
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume45
Issue number5 B
DOIs
Publication statusPublished - 2006 May 25

Keywords

  • Boundary acoustic wave
  • Electromechanical coupling factor adustment
  • Power flow angle
  • RF filter
  • SH wave

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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