First shear horizontal mode plate wave in LiNbO3 showing 20 km/s phase velocity

Michio Kadota, Shuji Tanaka, Tetsuya Kimura

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

1 Citation (Scopus)

Abstract

Currently, cognitive radio using a white space of digital TV (DTV) channels is receiving a lot of attention. One of the key devices of a cognitive radio handset is a tunable filter capable of adjusting frequency and bandwidth (BW) throughout DTV band. The authors developed ultra-wideband resonators in a DTV band and ultra-wideband filters fully covering all DTV channels using 0th shear horizontal mode plate wave (SH0) in a (0°, 120°, 0°) LiNbO3 plate. However, they are fabricated on a self-suspended ultra-thin LiNbO3 plate of only 0.5-0.6 μm in thickness, which is mechanically fragile and difficult to fabricate at high yield. A much higher phase velocity than that of SH0 is required to make the plate practically thicker. The objective of this study is to explore a different mode of plate wave showing much higher phase velocity and wide BW. By FEM simulation, it is clarified that a first SH mode (SH1) plate wave propagating in two kinds of new proposed structures, which are different from suitable SH0 mode structures for wide BW, has higher velocity than 20,000 m/s and wide BW of 24%.

Original languageEnglish
Title of host publication2015 IEEE International Ultrasonics Symposium, IUS 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479981823
DOIs
Publication statusPublished - 2015 Nov 13
EventIEEE International Ultrasonics Symposium, IUS 2015 - Taipei, Taiwan, Province of China
Duration: 2015 Oct 212015 Oct 24

Publication series

Name2015 IEEE International Ultrasonics Symposium, IUS 2015

Other

OtherIEEE International Ultrasonics Symposium, IUS 2015
CountryTaiwan, Province of China
CityTaipei
Period15/10/2115/10/24

Keywords

  • 1-th shear horizontal mode
  • DTV
  • high velocity
  • new structure
  • plate wave
  • wide band

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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