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. 17, 2002
Filed:
Nov. 13, 2001
Shigeru Tsuzuki, Osaka, JP;
Tsutomu Igaki, Hyogo, JP;
Ken Matsunami, Kyoto, JP;
Kazuki Nishimura, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A saw device comprises input/output interdigital transducer (IDT) electrodes( ) provided on piezoelectric substrates ( ), a first reflector electrode ( ) following the input IDT electrode ( ), and a second reflector electrode ( ) preceding the output IDT electrode ( ). The device satisfies the following inequality ( ) to provide preferable characteristics in a pass band: 2(&thgr;−5)≦tan (D/L)≦2(&thgr;+5) where &thgr;: the inclination (in degree, except zero) of the first or second reflector electrode of the input and output IDT electrodes with respect to a plane perpendicular to the direction in which surface acoustic waves travel. D: the pitch (in micron) of the input and output IDT electrodes in the direction in which surface acoustic waves travel. L: the pitch (in micron) of the first and second reflector electrodes.