Patent ID: 6545568
Filing Date: 2003-04-08
Classification: H01P

Abstract:
A dual-mode band-pass filter comprising:a dielectric substrate; an electrode pattern disposed on one main surface of the dielectric substrate or inside the dielectric substrate, said electrode pattern including a line-shaped electrode having a substantially constant line-width from a starting point to an end point thereof; a ground electrode disposed inside the dielectric substrate or on a main surface of the dielectric substrate so as to be opposed to the electrode pattern via a portion of the dielectric substrate; input-output coupling circuit electrodes coupled to the electrode pattern; and at least one of a capacitance loading portion and an inductance loading portion is disposed in a portion of the line-shaped electrode so that two resonance modes having different resonance frequencies and being generated at the electrode pattern are coupled to each other; wherein said electrode pattern is a substantially rectangular electrode pattern having four sides; and the electrode widths of two adjacent sides of the four sides are different from each other, and the electrode widths of two opposed sides of the four sides are the same.