5.4 GHz Lamb wave resonator on LiNbO3 thin crystal plate and its application

Michio Kadota, Takashi Ogami

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

A cognitive radio system operating at frequencies from 400 MHz to 6 GHz requires tunable filters with a wide variable frequency range. Wide band resonators are required to realize such tunable filters consisting of resonators. However, it is difficult to fabricate a very high frequency and wide band resonator, such as 6 GHz and wider than 10%, respectively. The first antisymmetric (A1) mode of a Lamb wave on a LiNbO3 thin plate or film having a high velocity and a large electromechanical coupling factor is a suitable wave for fabricating an ultrawide band and high frequency resonator. This time, we attempted to fabricate a higher frequency Lamb wave resonator on a thin LiNbO3 single-crystal plate instead of the LiNbO3 film, though it has been considered difficult to form a very thin LiNbO3 crystal plate. A new one-port Lamb wave resonator showed a high frequency in the 5 GHz range, a wide bandwidth of 12%, and a high impedance ratio of 62 dB at resonant and antiresonant frequencies. Moreover, we applied the resonator to a ladder-type tunable filter, and obtained the tunable range of 9% from 5.58 to 6.06 GHz theoretically.

Original languageEnglish
Article number07HD11
JournalJapanese journal of applied physics
Volume50
Issue number7 PART 2
DOIs
Publication statusPublished - 2011 Jul

ASJC Scopus subject areas

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

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