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. 26, 1987
Filed:
Nov. 15, 1985
Applicant:
Inventors:
Yoshishige Towatari, Tokyo, JP;
Tetsuo Akoh, Tokyo, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01P / ; H01P / ; H01P / ;
U.S. Cl.
CPC ...
333219 ; 333222 ; 29600 ; 204 371 ; 204 384 ;
Abstract
An improved dielectric resonator for high frequency operation having improved unloaded Q is provided which is prepared by forming a first copper coating on the ceramic body to a thickness of 0.2 to 1 .mu.m by electroless plating or vacuum deposition, electrolytic plating a second copper coating on the first coating to a thickness of at least two-fold of the skin depth, and heat treating the thus coated body at 120.degree.-300.degree. C. in a reducing atmosphere or at 700.degree.-1080.degree. C. in a weakly acidic atmosphere.