Coustic filter and resonator on periodical poled LiTaO3

Michio Kadota, Takashi Ogami, Kansho Yamamoto, Yasuo Cho

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

Abstract

A periodical poled (PP) plate looks like a cross-field model of an interdigital transducer (IDT) by Smith. Therefore, a top-electrode/PP-plate/ bottom-electrode has a possibility to generate an acoustic wave. Though acoustic wave devices using a PP plate and a pp film on substrate have been reported, their frequency responses were very weak as 0.1 to 3dB. It is considered that because their PP devices have neither electrode fingers of IDTs nor grating electrode reflectors, they do not have any effective reflection to realize a good frequency response, while conventional SAW devices have them. This time, authors have proposed an effective reflector using an edge reflection for the PP substrate device and applied it to a resonator and a resonator filter on a PP Z-plane LiTaO3 plate, which is different from previously reported substrates. As the result, authors have realized the resonator and the resonator filter having good frequency characteristics such as an impedance ratio of 34 dB, and an insertion loss of 2.6 dB and a relative bandwidth of 2.2 %, respectively, for the first time.

Original languageEnglish
Title of host publication2009 IEEE International Ultrasonics Symposium and Short Courses, IUS 2009
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2659-2662
Number of pages4
ISBN (Print)9781424443895
DOIs
Publication statusPublished - 2009
Event2009 IEEE International Ultrasonics Symposium, IUS 2009 - Rome, Italy
Duration: 2009 Sep 202009 Sep 23

Publication series

NameProceedings - IEEE Ultrasonics Symposium
ISSN (Print)1051-0117

Other

Other2009 IEEE International Ultrasonics Symposium, IUS 2009
CountryItaly
CityRome
Period09/9/2009/9/23

Keywords

  • Edge reflection
  • Periodical poled Z-LiTaO
  • Resonator
  • Resonator filter

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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