High frequency resonators with wide bandwidth using SH0 mode plate wave in thin LiNbO3

Michio Kadota, Masayoshi Esashi, Shuji Tanaka, Yasuhiro Kuratani, Tetsuya Kimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Currently, an ultrawide band resonator used for a tunable filter with a wide tunable range is strongly required, because a mobile phone with multi-bands and a cognitive radio system require such a tunable filter to simplify their wirelss front-end circuits. The authors developed resonators with ultrawide bandwidths of 26% to 29% and large impedance ratios of 92 to 98 dB between resonance (fr) and anti-resonance frequencies (a) using a 0-th shear horizontal (SH0) mode plate wave in a 28-30°YX-LiNbO3 plate. However, the resonators were of low frequency as r = 1.8 MHz and a = 2.3 MHz and suffer from ripples due to transverse mode between r and a. In this study, high frequency SH 0 mode plate wave resonators (r = 440 ∼ 560 MHz) with a wide bandwidth and a large impedance ratio and without ripples have been fabricated using an ultrathin LiNbO3 plate and an apodized interdigital transducer.

Original languageEnglish
Title of host publication2013 IEEE International Ultrasonics Symposium, IUS 2013
Pages1680-1683
Number of pages4
DOIs
Publication statusPublished - 2013 Dec 1
Event2013 IEEE International Ultrasonics Symposium, IUS 2013 - Prague, Czech Republic
Duration: 2013 Jul 212013 Jul 25

Publication series

NameIEEE International Ultrasonics Symposium, IUS
ISSN (Print)1948-5719
ISSN (Electronic)1948-5727

Other

Other2013 IEEE International Ultrasonics Symposium, IUS 2013
CountryCzech Republic
CityPrague
Period13/7/2113/7/25

Keywords

  • 0-th shear horizontal mode
  • Apodized IDT
  • High frequency
  • Large impedance ratio
  • Plate wave
  • Wideband

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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