Patent ID: 6304159
Filing Date: 2001-10-16
Classification: H01P

Abstract:
A dielectric filter with adjustable frequency bandwidth, said filter comprising:a dielectric ceramic block having first and second end surfaces, first and second lateral side surfaces opposite to each other, and third and fourth lateral side surfaces opposite to each other;a plurality of juxtaposed resonators, each resonator including a through hole provided within the block and extending from the first end surface to the second end surface of the block and an inner conductor layer provided on an inner wall surface of the through hole;an outer conductor layer disposed on outer surface portions of the block except for said first end surface;input/output pads disposed on the first lateral side surface of the block at respective positions close to said first end surface, each pad being capacitively coupled with an associated resonator and being disposed opposite to the associated resonator;a strip conductor member extending transversely between adjacent through holes on said first end surface of the block, the strip conductor member having one end connected to the outer conductor layer on the first lateral side surface of the block where the input/output pads are disposed, and an opposite end separated from the outer conductor layer on the second lateral side surface of the block so as to form an open circuit end; anda non-conductive region defined between the open circuit end of the strip conductor member and the outer conductor layer on the second lateral side surface.