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:
May. 08, 2001
Filed:
Mar. 18, 1999
Kazuo Tsubouchi, Miyagi 982-0222, JP;
Michio Yokoyama, Sendai, JP;
Shuichi Tomabechi, Sendai, JP;
Takumi Suetsugu, Yokose-machi, JP;
Yuichiro Imanishi, Nagoya, JP;
Tomohiko Shibata, Kasuga, JP;
Other;
Abstract
An output side electrode of a surface acoustic wave matched filter with portions having different delay times between taps. The output side electrode may be provided by arranging parallelly a plurality of output side electrodes having different scales, different tap distances, or by forming output side electrodes in an inclined fashion or in a dog-leg shape viewed in a direction of an aperture length, or by arranging, between electrode fingers, thin films having different dimensions or thicknesses viewed in the direction of the aperture length, or by forming, between electrode fingers, recessed portions having different dimension or depth viewed in the direction of the aperture length. In the surface acoustic wave matched filter for use in a spread spectrum communication, it is possible to prevent a decrease in a correlation caused by a variation in a propagating velocity of a surface acoustic wave due to a temperature characteristic as well as by fluctuations in the propagating velocity for respective substrates or within a single substrate.