| 摘要 |
Provided is a bandpass filter which can cope with a wide band and has a large degree of freedom in designing a pass band. Provided also are a radio communication module and a radio communication device using the bandpass filter. The bandpass filter includes a first, a second, and a third resonator (10, 20, 30). The first and the third resonator (10, 30) have a resonance frequency f1 while the second resonator (20) has a resonance frequency f2 which is different from f1. If fe is the even-number mode resonance frequency of a resonance system formed by the first and the third resonator (10, 30) and fo is the odd-number mode resonance frequency, f2 is lower or higher than both of fe and fo. The bandpass filter has a pass band including fe, fo, and f2.
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