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:
Oct. 07, 1997
Filed:
May. 22, 1996
Yasuhiro Hirao, Osaka-fu, JP;
Kuniyuki Matsui, Osaka-fu, JP;
Yasumi Kobayashi, Osaka-fu, JP;
Kousuke Takeuchi, Osaka-fu, JP;
Kenichi Shibata, Wakayama-ken, JP;
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
A surface acoustic wave convolver of the present invention includes, on a surface of a piezoelectric substrate, a pair of comb-like surface acoustic wave excitation electrodes 2 and 3, and a center electrode 4. The excitation electrodes 2 and 3 are disposed opposed to each other at a specified interval while the center electrode 4 having a shorter width than a length of the excitation electrodes 2 and 3 is positioned between the electrodes 2 and 3. The center electrode 4 propagates the surface acoustic waves respectively produced by the excitation electrodes 2 and 3 in reverse directions to each other to obtain a convolution output signal. A pair of reflectors 10 are positioned on opposite sides of a region defined between the excitation electrode 2 and one end of the center electrode 4 with a width equivalent to that of the center electrode 4. Also, a pair of reflectors 11 are positioned on opposite sides of a region defined between the excitation electrode 3 and the other end of the center electrode 4 with a width equivalent to that of the center electrode 4.