| 摘要 |
<P>PROBLEM TO BE SOLVED: To accomplish a dual-band bandpass filter that has high flexibility in designing a total of four characteristic values, that is, the center frequency and bandwidth of the two pass bands, and also has a characteristic of substantially blocking unwanted signals in the bands other than the desired pass bands, and further is miniaturized. Ž<P>SOLUTION: The dual-band bandpass filter includes a plurality of dual-band bandpass resonators. The dual-band bandpass resonator constituted of: a central conductor having a central axis aligned with an input/output direction; a pair of grounding conductors; a central conductor short-circuit part; and a pair of stub conductors that, which are formed on a surface of a dielectric substrate. The pair of grounding conductors are disposed on the opposite sides of the central conductor with a space interposed therebetween. The central conductor short-circuit part short-circuits the pair of grounding conductors, and one end of the central conductor is connected to the central conductor short-circuit part. The pair of stub conductors are disposed in the spaces on the opposite sides of the central conductor symmetrically with respect to the central axis of the central conductor, extend at least partially parallel with the central conductor and are connected to the central conductor short-circuit part at one ends thereof. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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