The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 1999
Filed:
Sep. 24, 1997
Shohachi Nishijima, Komatsu, JP;
Hiromi Ogura, Ishikawa-ken, JP;
Abstract
The invention provides a technique of adjusting the mutual capacitance of resonant through-holes in a dielectric filter while maintaining the shape of input/output electrodes constant without causing a change in the external capacitance. In one such dielectric filter, a plurality of resonant through-holes are formed in a dielectric block, each resonant through-hole including a large-diameter hole and a small-diameter hole, a step being formed at the boundary between the large-diameter hole and the small-diameter hole, the inner wall of each said resonant through-hole being covered with an inner conductor; an outer conductor formed on outer surfaces of said dielectric block except for an end surface in which ends of the respective large-diameter holes are located; and input/output electrodes which are formed on a side face such that said input/output electrodes are coupled with said large-diameter holes; wherein the center axes of said large-diameter holes are deviated from the center axes of the corresponding small-diameter holes, thereby increasing the mutual capacitance between the large-diameter holes.