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:
Mar. 17, 2009
Filed:
May. 25, 2006
Kazuhiro Otsuka, Kyoto, JP;
Daisuke Makibuchi, Kyoto, JP;
Tsuyoshi Nakai, Kyoto, JP;
Atsuomi Fukuura, Kyoto, JP;
Hiroyuki Tanaka, Kyoto, JP;
Ikuo Obara, Kyoto, JP;
Kiyohiro Iioka, Kyoto, JP;
Kazuhiro Otsuka, Kyoto, JP;
Daisuke Makibuchi, Kyoto, JP;
Tsuyoshi Nakai, Kyoto, JP;
Atsuomi Fukuura, Kyoto, JP;
Hiroyuki Tanaka, Kyoto, JP;
Ikuo Obara, Kyoto, JP;
Kiyohiro Iioka, Kyoto, JP;
Kyocera Corporation, Kyoto, JP;
Abstract
A plurality of IDT electrodestoeach having a large number of electrode fingers extending in a direction perpendicular to a propagation direction of a surface acoustic wave propagating on a piezoelectric substrateare arranged on the piezoelectric substratealong the propagation direction, and each of the two adjacent IDT electrodes out of the plurality of IDT electrodestocomprises a variable pitch section and a fixed pitch section. The electrode finger pitch in the variable pitch section gradually decreases toward the boundary between the two adjacent IDT electrodes, and the minimum electrode finger pitch portion in the two variable pitch sections is on one side spaced apart from the boundary. There can be provided a surface acoustic wave apparatus having a large pass bandwidth, having a low insertion loss, and having improved flatness in a pass band.