Bandwidth-tunable SAW filter based on wafer-level transfer-integration of BaSrTiO3 film for wireless LAN system using TV white space

Hideki Hirano, Tetsuo Samoto, Tetsuya Kimura, Masahiro Inaba, Ken Ya Hashimoto, Takeshi Matsumura, Kousuke Hikichi, Michio Kadota, Masayoshi Esashi, Shuji Tanaka

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

19 Citations (Scopus)

Abstract

Cognitive radio technology on TV white spaces has been promoted worldwide to solve the spectrum shortage problem due to the explosive increase in personal communication systems such as smartphones. One of the most difficult challenges to utilize TV white space for personal use is the miniaturization of frequency and bandwidth tunable filters to select vacant TV channels. We have developed a one-chip bandwidth tunable filter by wafer-level transfer-integration of BaSrTiO3 (BST) film varactors and surface acoustic wave (SAW) resonators on a lithium tantalate wafer. The 3 dB bandwidth of the bandwidth tunable filter is tuned between 3.25 MHz and 6.25 MHz by applying 7V to the varactors, while the center frequency was constant at 1.004 GHz, as designed. These filters were installed in our developed prototype cognitive radio systems based on the IEEE802.11af draft and successfully demonstrated wireless LAN communication on TV frequency band.

Original languageEnglish
Title of host publicationIEEE International Ultrasonics Symposium, IUS
PublisherIEEE Computer Society
Pages803-806
Number of pages4
ISBN (Electronic)9781479970490
DOIs
Publication statusPublished - 2014 Oct 20
Event2014 IEEE International Ultrasonics Symposium, IUS 2014 - Chicago, United States
Duration: 2014 Sep 32014 Sep 6

Publication series

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

Other

Other2014 IEEE International Ultrasonics Symposium, IUS 2014
Country/TerritoryUnited States
CityChicago
Period14/9/314/9/6

Keywords

  • BST
  • IEEE802.11af
  • TV white-space
  • Tunable SAW filter
  • Variable capacitor
  • cognitive radio
  • lithium tantalate

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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