Patent ID: 6566987
Filing Date: 2003-05-20
Classification: H01P

Abstract:
A dielectric filter comprising:a substantially rectangular dielectric block; a plurality of inner-conductor holes having respective apertures in a first end surface of said dielectric block and in a second end surface which is opposite to said first end surface of said dielectric block; a plurality of inner conductors formed respectively on the inner surfaces of said plurality of inner-conductor holes; at least one concavity formed in one of said first and second surfaces in which the apertures of said plurality of inner-conductor holes are formed; and an outer conductor formed on the outer surface of said dielectric block including the inner surface of said at least one concavity; wherein said concavity shifts higher the resonance frequency in a TE mode in which the electric field is aligned in the direction perpendicular to both an axial direction and the direction of array of said plurality of inner-conductor holes.