| 摘要 |
PROBLEM TO BE SOLVED: To provide a ladder filter with less number of components to attain downsizing that causes no migration in parallel resonators even when a high voltage is applied to its output. SOLUTION: The ladder filter in which a ladder circuit is configured by mounting series resonators 10-12 and parallel resonators 13-15 on a substrate 20 on which input, output and earth pattern electrodes are formed, and a cap 30 is adhered to the substrate 20 so as to cover the resonators 10-15, and a DC-cut capacitor 19 is connected in series halfway the output electrode 22 of the substrate 20.
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