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:
Jul. 11, 2000
Filed:
Mar. 03, 1998
Jun Toda, Ishikawa-ken, JP;
Haruo Matsumoto, Kanazawa, JP;
Abstract
A dielectric filter and a dielectric duplexer having a dielectric block with resonator holes formed therein, each having a large-sectional-area portion and a small-sectional-area portion so that the resonator hole has different respective inner diameters at an open-circuited end and a short-circuited end. Each large-sectional-area portion is formed with the cross-sectional shape of an elongated circle, an ellipse, or a rectangle, for example, the cross-sectional shape defining a longitudinal axis which is disposed at an angle against with respect to a plane in which the resonator holes are arranged. The invention increases the degree of freedom in providing a desired resonant frequency and a desired degree of coupling between resonators, in order to be able to easily provide desired filter characteristics, even in a case in which the external dimensions of the required dielectric block are restricted. Also disclosed is a method of manufacturing the dielectric filter and dielectric duplexer, as well as a radio transceiver utilizing the dielectric duplexer.