スプリアスモード抑圧形・縦振動音片の解析

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タイトル別名
  • スプリアス モード ヨクアツケイ タテシンドウ オンペン ノ カイセキ
  • An Analysis of a Longitudinal Resonator for Suooression of Spurious Mode
  • スプリアスモード ヨクアツケイ タテ シンドウ オンヘン ノ カイセキ

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論文(Article)

This paper deals with a theoretical analysis and some experimental results on the longitudinal resonator which is suttable for frequencies above 30KHz.　In order to suppress the unwanted flexural modes, the piezoelectric ceramics are bonded on four surfaces of the slnder resonator with square cross sections, and the electrode of a piezoelectric ceramic is formed like a sinusoidal function for the longitudinal resonator to vibrate only in the wanted mode.　Here are discussed the equivalent circuit constants and the apparent resonant frequency of the resonator in due consideration of the impedance of the piezoelectric ceramics, and the results are compared with those of resonators with the normal electrode and the partial one. Furthermore, the response curves of a differential type mechanical filter consisting of the longitudinal resonators are shown.　These results show that the sine-shaped electrode is effective in suppressing spurious responses in the mechanical filter consisting of the longitudinal resonator.

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