A solidly mounted, high frequency, thickness shear mode bulk acoustic wave resonator using X-LiTaO3thin plate and SiO2/Ta multilayer acoustic films

Michio Kadota, Yoshimi Ishii, Shuji Tanaka

Research output: Contribution to journalArticlepeer-review

Abstract

This paper describes a bulk acoustic wave (BAW) high-frequency resonator with a solidly mounted structure using a single crystal LiTaO3 (LT) thin plate. A Bragg reflector solidly supports the LT thin plate, which is fragile if self-suspended. The BAW resonator uses a thickness shear mode in 1.5 μm thick X-LT. The Bragg reflector is made of four pairs of SiO2 and Ta films, i.e. eight layers in total. The fabricated device works at a resonance frequency of 1.14 GHz and an antiresonance frequency of 1.23 GHz, showing a bandwidth of 7.9% and a low-Temperature coefficient of frequency of-16 ppm °C-1 and-26 ppm °C-1 at the maximum and minimum admittances, respectively. The measured impedance ratio is 61 dB, although the structure and fabrication process are not optimized yet, suggesting a high potential for this device.

Original languageEnglish
Article numberSDDC11
JournalJapanese journal of applied physics
Volume60
DOIs
Publication statusPublished - 2021 Jul

ASJC Scopus subject areas

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

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