Radio frequency surface acoustic wave filter having narrow bandwidth and excellent temperature characteristic

Takaki Murata, Michio Kadota, Takeshi Nakao, Kenji Matsuda

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

An RF filter in the high-frequency range such as that used in MediaFLO™ and time division synchronous code division multiple access in a Chinese handy phone system requires a narrow bandwidth and also a very excellent temperature coefficient of frequency (TCF). A flat SiO2 /high-density metal electrode/36-48° YX-LiTaO3 structure has been applied to this system by adjusting the optimum thickness of SiO2 and the metal electrode to realize a very excellent TCF. As a result, the RF filter with a very excellent TCF of - 1.01 ppm/°C, a good insertion loss, and a large outband rejection has been realized.

Original languageEnglish
Pages (from-to)4101-4103
Number of pages3
JournalJapanese journal of applied physics
Volume47
Issue number5 PART 2
DOIs
Publication statusPublished - 2008 May 23

Keywords

  • Excellent TCF
  • High-density metal
  • Narrow band
  • RF filter
  • SAW

ASJC Scopus subject areas

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

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