Patent ID: 7119639
Filing Date: 2006-10-10
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 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 through a dielectric layer; and a pair of input-output coupling circuits connected to different portions of the metallic film; wherein the shape of the metallic film is substantially rectangular including only four sides, the connection points of the input-output coupling circuits are located on opposite sides of said substantially rectangular metallic film, and the connection points of the input-output coupling circuits are located on one side of an imaginary straight line passing through center points of each of the opposite sides of the substantially rectangular metallic film.