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:
May. 13, 2003
Filed:
May. 30, 2001
Arun Chandra Kundu, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A highly compact band pass filter that reliably achieves desired characteristic is disclosed. A band pass filter according to the present invention employs first and second disk resonators having exciting electrodes formed on one side surface thereof, an evanescent waveguide interposed between the first and second disk resonators, and a capacitive stub formed on other side surfaces of the first and second disk resonators. The capacitive stub reduces the size of the band pass filter because a resonant frequency of the disk resonators is lowered by the capacitive stub. Further, the capacitive stub enhances the mechanical strength of the band pass filter because a coupling constant k between the disk resonators is lowered by the capacitive stub.