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. 07, 1999
Filed:
Mar. 14, 1997
Kenji Endo, Abiko, JP;
TDK Corporation, Tokyo, JP;
Abstract
A block type dielectric filter including a dielectric block and a plurality of through holes wherein a resonance frequency at individual resonating portions can be set at a specific value even when the dielectric filter is miniaturized. The resonance frequencies can be varied at the individual resonating portions simply by creating a slight change in a coupling factor. The plurality of through holes are provided extending from one surface of the dielectric block toward an opposite surface. The surfaces except for an open end surface are clad with a conductive material layer and a groove is provided on the open end surface between a set of adjacent through holes. The groove is provided offset toward a through hole by an offset quantity.