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. 14, 2015
Filed:
Dec. 22, 2011
Tsuyoshi Komatsu, Kirishima, JP;
Satoshi Toyoda, Kirishima, JP;
Hidehiro Takenoshita, Kirishima, JP;
Tsuyoshi Komatsu, Kirishima, JP;
Satoshi Toyoda, Kirishima, JP;
Hidehiro Takenoshita, Kirishima, JP;
KYOCERA Corporation, Kyoto, JP;
Abstract
There are provided a dielectric ceramic having a high Qf value in a relative permittivity ∈r range of 35 to 45, and a small absolute value of a temperature coefficient τf which indicates change of the resonant frequency in a wide temperature range from a low temperature range to a high temperature range, and a dielectric filter having the dielectric ceramic. A dielectric ceramic includes: a main component, molar ratios α, β, and γ satisfying expressions of 0.240≦α≦0.470, 0.040≦β≦0.200, 0.400≦γ≦0.650, and α+β+γ=1 when a composition formula of the main component is represented as αZrO.βSnO.γTiO; and Mn, a content of Mn in terms of MnObeing greater than or equal to 0.01% by mass and less than 0.1% by mass with respect to 100% by mass of the main component.