| 摘要 |
PURPOSE:To realize the excellent characteristics of frequency selection and pressure increase at the same time in a high frequency band by using the advanced modes of the degree of the odd number of thickness vertical oscillation, and utilizing the phenomenon of energy confinement. CONSTITUTION:This filter is composed of a low impedance part wherein four layer energy confined electrodes 41 and 41' exist on the left side of a piezo ceramic plate 40' and an impedance part wherein two layer energy confined electrodes 42 and 42' exist. Thereby, pressure increase is enabled in a frequency band of several MHz or more, and excellent resonance response can be obtained. Therefore, the region of the application of the titled device can be remarkably expanded.
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