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:
Apr. 09, 2002
Filed:
Oct. 12, 2000
Applicant:
Inventors:
Tsutomu Tatekawa, Otsu, JP;
Hitoshi Takagi, Omihachiman, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01P 1/202 ;
U.S. Cl.
CPC ...
H01P 1/202 ;
Abstract
High frequency dielectric ceramic compositions having a dielectric constant (∈ ) of 30 to 50, a Q value of 15,000 or more at 1 GHz, and a temperature-dependent factor of resonant frequency (&tgr;f) which can be arbitrarily controlled centering around 0 (ppm/° C.) have a main crystal of the perovskite type crystal phase by (1−x)MeTi O —xLn(Ma Mb ) O , wherein Ln is a rare earth element, Ma is at least one of Mg and Zn, Mb is at least one of Sn and Zr, Me is at least one of Ca and Sr, x is the mole fraction, and 0.95≦a≦1.05, 0.9≦b≦1.05 and 0.3≦x≦0.5.