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. 07, 2005
Filed:
Sep. 24, 2002
Hiroki Wakamatsu, Ishikawa-ken, JP;
Hiroyuki Kubo, Kusatsu, JP;
Hiroki Wakamatsu, Ishikawa-ken, JP;
Hiroyuki Kubo, Kusatsu, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
The present invention provides a dielectric resonator having increased reliability with respect to thermal cycle fatigue of a joint between a conductive cavity and a dielectric core disposed in the cavity without an increase in material cost and processing cost, a filter and duplexer each using the dielectric resonator, and a communication device including these devices. The dielectric resonator has a structure in which the dielectric core is provided in the cavity through earth plates. Each of the earth plates has slits provided at positions in contact with the four corners of each of two opposing side faces of the dielectric core. Of the four sides of each of the earth plates, the two sides provided with spring portions are preferably inclined so that the distance between the two sides decreases toward the bottom of the cavity, and concave portions are formed in the inner surface of the cavity corresponding to the two inclined sides. Therefore, solder cream can be previously applied to predetermined positions of the concave portions of the cavity.