Longitudinally coupled resonator filter using edge reflection of Bleustein-Gulyaev-Shimizu and shear horizontal waves with various bandwidths realized by selecting substrates

M. Kadota, J. Ago, H. Horiuchi, M. Ikeura

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

A conventional surface acoustic wave (SAW) resonator filter requires reflectors with many grating fingers at both sides of the interdigital transducers (IDTs). On the other hand, a small-sized low-loss resonator filter without grating fingers can be realized by utilizing the reflection of a Bleustein-Gulyaev-Shimizu (BGS) wave or a shear horizontal (SH) wave at the edge of a substrate. As a result, the authors have developed longitudinally coupled resonator filters using the reflection of BGS and SH waves at the edges of a substrate. Longitudinally coupled resonator filters on piezoelectric ceramic substrates for the first intermediate frequency (IF) stage have been realized to be low-loss, small-sized and extremely wide bandwidth (fractional bandwidth of 15%) filters as compared to the ordinary resonator filters, and they can have various kinds of bandwidths (2 to 15 %) by employing ceramic substrates with various electromechanical coupling factors. On the other hand, the edge-reflection-type resonator filters on LiTaO3 single crystal for various first IF stages have also been realized to be low-loss and small-sized filters. In spite of being a wire-bonding type of IF filter, the package size of this filter is the same as that of the radio frequency (RF) SAW filter.

Original languageEnglish
Pages (from-to)3722-3725
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume40
Issue number5 B
DOIs
Publication statusPublished - 2001 May

Keywords

  • Bleustein-Gulyaev-Shimizu wave
  • Edge reflection
  • LiTaO
  • Longitudinally coupled resonator filter
  • Low loss
  • PZT
  • Shear horizontal wave
  • Small-sized package
  • Various bandwidths

ASJC Scopus subject areas

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

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