| 摘要 |
A surface acoustic wave device with an electrode structure that suppresses the deterioration of a withstand voltage against an overvoltage such as a surge voltage or noise applied to a balanced signal terminal is provided. A serial resonator 5 that blocks a voltage is disposed among IDTs 7, 9, 11 and a signal output terminal 3 of the surface acoustic wave device. In addition, a serial resonator 6 is disposed among the IDTs 7, 9, 11, and a signal output terminal 4. The serial resonators 5 and 6 operate as part of IDTs to extract a desired band signal. The structure of the serial resonator 5 should be almost the same as that of the serial resonator 6.
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