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. 29, 2005
Filed:
Feb. 06, 2002
Takao Mukai, Ishikawa-ken, JP;
Michio Kadota, Kyoto, JP;
Hideya Horiuchi, Nagaokakyo, JP;
Mamoru Ikeura, Nagaokakyo, JP;
Takao Mukai, Ishikawa-ken, JP;
Michio Kadota, Kyoto, JP;
Hideya Horiuchi, Nagaokakyo, JP;
Mamoru Ikeura, Nagaokakyo, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
An edge reflection surface acoustic wave filter includes IDTs disposed on a top surface of a piezoelectric substrate, and surface acoustic waves of the Shear Horizontal type are reflected between opposite edges. At least one outermost electrode finger in the direction of propagation of surface acoustic waves on the side of at least one of the edges is removed. Accordingly, desired filter characteristics can readily be achieved without causing variations in filter characteristics, spurious components at frequencies lower than the passband are minimized, and selectivity is greatly improved.