Vibration Mode Observation of Piezoelectric Disk-type Resonator by High Frequency Laser Doppler Vibrometer

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  • Matsumura Takeshi
    National Institute of Information and Communications Technology (NICT), New Generation Wireless Communications Research Center
  • Esashi Masayoshi
    World Premier International Research Center, Advanced Institute for Materials Research
  • Harada Hiroshi
    National Institute of Information and Communications Technology (NICT), New Generation Wireless Communications Research Center
  • Tanaka Shuji
    Department of Nanomechanics, Tohoku University

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Other Title
  • 高周波レーザドップラ振動計による圧電ディスク型共振子の振動モードの観察
  • コウシュウハ レーザドップラ シンドウケイ ニ ヨル アツデン ディスクガタ キョウシンシ ノ シンドウ モード ノ カンサツ
  • Vibration mode observation of piezoelectric disk‐type resonator by high‐frequency laser Doppler vibrometer

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For future mobile phones based on cognitive radio technology, a compact multi-band RF front-end architecture is strongly required and an integrated multi-band RF filter bank is a key component in it. Contour-mode resonators are receiving increased attention for a multi-band filter solution, because its resonant frequency is mainly determined by its size and shape, which are defined by lithography. However, spurious responses including flexural vibration are also excited due to its thin structure. To improve resonator performance and suppress spurious modes, visual observation with a laser probe system is very effective. In this paper, we have prototyped a mechanically-coupled disk-array filter, which consists of a Si disk and 2 disk-type resonators of higher-order wine-glass mode, and observed its vibration modes using a high-frequency laser-Doppler vibrometer (UHF-120, Polytec, Inc.). As a result, it was confirmed that higher order wine-glass mode vibration included a compound displacement, and that its out-of-plane vibration amplitude was much smaller than other flexural spurious modes. The observed vibration modes were compared with FEM (Finite Element Method) simulation results. In addition, it was also confirmed that the fabrication error, e.g. miss-alignment, induced asymmetric vibration.

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