Importance

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Abstract

A dual-band bandpass filter according to the present invention includes a plurality of dual-band bandpass resonators. The dual-band bandpass resonator includes 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 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.

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First Claim