| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a bandpass filter which relieves a spurious response resulting from serial resonance of a transmission line and has broadband low spurious characteristics when the bandpass filter is constituted by connecting a resonant circuit by the transmission line in order to obtain a broadband pass band. Ž<P>SOLUTION: The bandpass filter is provided with: a plurality of parallel resonant circuits (3, 4) which resonate in a use frequency; and a plurality of transmission lines (2) for coupling, and is constituted by alternatively performing cascade connection between the parallel resonant circuits and the transmission lines for coupling, wherein electric length of the plurality of transmission lines for coupling becomes two or more kinds of different values. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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