Patent ID: 7098760
Filing Date: 2006-08-29
Classification: H01P

Abstract:
1. A dual mode band-pass filter comprising: a dielectric substrate having first and second main surfaces; a metallic film having an opening and disposed on the first main surface of the dielectric substrate or inside of the dielectric substrate; at least one ground electrode disposed on the second main surface of the dielectric substrate or inside of the dielectric substrate, so as to be opposed to the metallic film with the dielectric substrate disposed therebetween; and a pair of input-output coupling circuits connected at connection points to different portions of the metallic film; wherein the shape of the metallic film is substantially rectangular and the connection points of the pair of input-output coupling circuits are located on one side of said substantially rectangular metallic film: wherein the substantially rectangular metallic film and the opening therein are configured such that first and second resonance modes of the dual mode band-pass filter are coupled.