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:
Nov. 05, 2002
Filed:
Aug. 16, 2001
Hitoshi Kitagawa, Miyagi-ken, JP;
Makoto Sasaki, Miyagi-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a thin-film capacitor which can easily meet requirements of reduction in size, thickness, and weight and which can perform temperature compensation. In addition to the features described above, the present invention provides a thin-film capacitor having a superior Q factor in a high frequency band. The thin-film capacitor of the present invention has at least one first dielectric thin-film and at least one second dielectric thin-film having a dielectric constant different from that of the first dielectric thin-film, wherein these thin-films are provided between a pair of electrodes. In addition, in the present invention, the absolute value of the temperature coefficient of capacitance of the first dielectric thin-film is 50 ppm/° C. or less, and the temperature coefficient of capacitance of the second dielectric thin-film is a negative value and has an absolute value of 500 ppm/° C. or more.