Bleustein-Gulyaev-Shimizu wave resonators formed on ceramic substrates and their applications

Kazuhiko Morozumi, Michio Kadota

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In a frequency range that is between 30 and 60 MHz, piezoelectric resonators have not been employed widely in consumer electronics due to their size and the difficulty in precisely tuning their frequencies. Thus, liquid crystal (LC) resonators have been extensively used instead. The authors of this paper have successfully developed and commercialized Bleustein-Gulyaev-Shimizu wave free-edge reflection resonators made of piezoelectric ceramics lead zirconate-titanate (PZT), which have both a small temperature coefficient (9 ppm/°C) and a large electromechanical coupling coefficient (k2 = 0.22). These resonators have been evaluated as additional traps for nonfrequency tuning resonators that replace both LC resonators requiring tuning and resonators needing autofrequency tuning (AFT). In the former application, the present resonators exhibit trap characteristics with steeper and larger attenuation than those of conventional LC resonators. In the latter application, the present resonators exhibited AFT sensitivity characteristics which are similar to those of conventional LC resonators. When the present resonators were incorporated into voltage-controlled oscillator circuits, they exhibited a very wide adjustable frequency range of 3.7 MHz.

Original languageEnglish
Pages (from-to)30-38
Number of pages9
JournalElectronics and Communications in Japan, Part II: Electronics (English translation of Denshi Tsushin Gakkai Ronbunshi)
Volume79
Issue number4
Publication statusPublished - 1996 Apr

Keywords

  • AFT trap
  • BGS wave
  • Ceramic resonator
  • Edge reflection resonator
  • PZT
  • VCO

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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