Dual-mode band-pass filter

摘要

A dual-mode band-pass filter is provided which can be reduced in size and has a high design flexibility. The dual-mode band-pass filter has a frame-shaped electrode pattern (23) formed on one face or inside a dielectric substrate. A pair of input-output circuits (5, 6) are coupled to the frame-shaped electrode pattern (23). The plane shape and the line-width of the frame-shaped electrode pattern (23) is configured so that two generated resonance modes can be coupled to each other.