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. 02, 1999
Filed:
Apr. 19, 1996
Yasumi Kobayashi, Osaka-fu, JP;
Kuniyuki Matsui, Osaka-fu, JP;
Yasuhiro Hirao, Osaka-fu, JP;
Kousuke Takeuchi, Osaka-fu, JP;
Hiroshi Kayaki, Osaka-fu, JP;
Yusuke Takahashi, Osaka-fu, JP;
Toshiharu Tanaka, Osaka-fu, JP;
Isao Kiyose, Osaka-fu, JP;
Kenichi Shibata, Wakayama-ken, JP;
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
A surface acoustic wave filter according to the present invention is constructed by connecting in series one or two or more filter functional units each comprising a first surface acoustic wave resonator having input and output terminals connected in series with a signal line and a second surface acoustic wave resonator having input and output terminals one of which is connected to the signal line and the other of which is grounded. The first surface acoustic wave resonator is constituted by one interdigital transducer and a pair of electrically open strip type grating reflectors with the interdigital transducer interposed therebetween, and the second surface acoustic wave resonator is constituted by one interdigital transducer and a pair of electrically short strip type grating reflectors with the interdigital transducer interposed therebetween.