| 摘要 |
An electric filter according to an embodiment of the present invention is an electric filter having a piezoelectric resonator 10 to obtain a signal of a predetermined resonance frequency from a bulk wave propagating inside a piezoelectric film 15. This electric filter is configured to satisfy k<SUP>2</SUP>>(BP/0.6f), where k<SUP>2 </SUP>is the square of an effective electromechanical coupling coefficient of the piezoelectric resonator 10, BP a pass bandwidth of the electric filter, and f a center frequency of a target pass band of the electric filter.
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