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:
Dec. 26, 2006
Filed:
Sep. 28, 2004
Koichi Wada, Yokohama, JP;
Satoshi Ichikawa, Otawara, JP;
Hirotada Wachi, Yokohama, JP;
Tohru Takezaki, Yokohama, JP;
Tsuyoshi Oura, Kawasaki, JP;
Toshifumi Tanaka, Otawara, JP;
Satoshi Orito, Yokohama, JP;
Koichi Wada, Yokohama, JP;
Satoshi Ichikawa, Otawara, JP;
Hirotada Wachi, Yokohama, JP;
Tohru Takezaki, Yokohama, JP;
Tsuyoshi Oura, Kawasaki, JP;
Toshifumi Tanaka, Otawara, JP;
Satoshi Orito, Yokohama, JP;
Fujitsu Media Devices Limited, Kanagawa, JP;
Abstract
A filter includes a piezoelectric substrate, and interdigital transducers (IDTs) that are formed on the piezoelectric substrate. At least one of the IDTs has a main electrode finger pattern that is weighted. The IDT having the main electrode finger pattern also has a sub electrode finger pattern that is connected in parallel to the main electrode finger pattern, and generates a surface acoustic wave that cancels a surface acoustic wave caused by leakage electric fields generated in the main electrode finger pattern.