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:
Jun. 17, 2003
Filed:
Jul. 14, 2000
Hideki Tsukamoto, Ishikawa-ken, JP;
Katsuhito Kuroda, Matto, JP;
Jinsei Ishihara, Kanazawa, JP;
Hideyuki Kato, Ishikawa-ken, JP;
Murata Manufacturing Co., Ltd., Kyoto-fu, JP;
Abstract
A dielectric filter, a dielectric duplexer, a communication apparatus are capable of arbitrarily determining the coupling degree of an external coupling without changing the intensity between resonators and miniaturization. Resonator holes are aligned in a dielectric block with a step structure of a large-diameter portion extending in a thickness direction of a dielectric block and a small-diameter portion smaller than the large-diameter portion, and a predetermined pitch is set between the small-diameter portions of the resonator holes and excitation holes by decentering the central axis of the small-diameter portion from the central axis of the large-diameter portion, thereby deciding the intensity of the external coupling.