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:
Oct. 16, 2001
Filed:
Apr. 07, 2000
Takaya Wada, Omihachiman, JP;
Hiroshi Tamura, Otsu, JP;
Abstract
A high-frequency dielectric ceramic composition comprises Ba, Ti, Nd, Sm, and Pr as primary components represented by the formula xBaO-yTiO,-z{(1−m−n)Nd,O,-mSm,O,-nPr,O,} wherein coefficients x, y, z, m, and n represent molar ratios, x+y+z=1, 0<m≦0.40, 0<n≦0.25, and the coefficients x, y, and z are in an area bounded by points A, B, C and D in a ternary diagram, wherein point A is at (x=0.16, y=0.70, z=0.14), point B is at (x=0.16, y=0.68, z=0.16), point C is at (x=0.13, y=0.68, z=0.19), and point D is at (x=0.13, y=0.70, z=0.17); wherein the composition further comprises a Bi compound in an amount of more than 0 parts by weight to about 9 parts by weight on the basis of Bi,O,and an Fe compound in an amount of more than 0 parts by weight to about 0.3 parts by weight on the basis of Fe,O,as additional components with respect to 100 parts by weight of the primary components. The high-frequency dielectric ceramic composition exhibits high reduction resistance during a sintering process, has a high relative dielectric constant ∈,and a stable Q value in a microwave band, and can control the temperature coefficient &tgr;f of the resonant frequency to an appropriate value in the vicinity of zero ppm/° C.