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. 24, 1998
Filed:
Oct. 11, 1996
Applicant:
Inventor:
Yutaka Tada, Kyoto, JP;
Assignee:
Murata Manufacturing Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H / ; H03H / ;
U.S. Cl.
CPC ...
333193 ; 3103 / ; 3103 / ;
Abstract
A surface acoustic wave filter has pairs of interdigital transducers and reflectors formed on a 36.degree. Y-X LiTaO.sub.3 substrate, the reflectors sandwiching the interdigital transducers in between. The film thickness h of the electrode fingers of the interdigital transducers and the reflectors is such that 0.06.ltoreq.h/.lambda..ltoreq.0.01 where .lambda. is the wavelength of the surface acoustic wave adapted to be generated by the filter. The width-to-pitch ratio M/P of these electrode fingers for the interdigital transducers and the reflectors is such that M/P.gtoreq.0.6 in order to improve the shape factor of the filter.