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:
Aug. 24, 2010
Filed:
Sep. 25, 2008
Masaru Abe, Nikaho, JP;
Kakeru Watanabe, Yurihonjo, JP;
Ryohei Nakano, Kamakura, JP;
Yasuo Niwa, Yurihonjo, JP;
Matsumi Watanabe, Yurihonjo, JP;
Masaru Abe, Nikaho, JP;
Kakeru Watanabe, Yurihonjo, JP;
Ryohei Nakano, Kamakura, JP;
Yasuo Niwa, Yurihonjo, JP;
Matsumi Watanabe, Yurihonjo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A dielectric ceramic composition comprising forsterite in an amount of 93.0 to 99.0 mol % when calculating in terms of 2MgO.SiOand calcium titanate in an amount of 1.0 to 7.0 mol % when calculating in terms of CaTiOas main components, and as a subcomponent, aluminum oxide in an amount of 0.2 to 5 mass % when calculating in terms of AlOper 100 mass % of said main components. According to the present invention, a dielectric ceramic composition, capable of having both low permittivity and good frequency-temperature characteristic as well as ensuring high Qf value and further having sufficient mechanical strength, and suitable to use in an antenna, a filter and the like used in the high-frequency region, can be provided. Also, the present invention allows providing a dielectric ceramic composition further having resistance to reduction in addition to all of the above properties.