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. 05, 1992
Filed:
Jan. 03, 1991
Osamu Noguchi, Tokyo, JP;
Kazuyoshi Sugai, Tokyo, JP;
Clarion Co., Ltd., Tokyo, JP;
Abstract
A surface acoustic wave device is disclosed, by which it is possible to improve characteristics of a system suitable for suppressing narrow frequency band interference, which is useful for a spread spectrum communication system, and to increase the signal intensity at the detecting portion without changing characteristics of the filter portion. In a surface acoustic wave element, in a p conductivity type Si epitaxial layer 2 formed on a p+ conductivity type Si monocrystal substrate 1 the epitaxial layer on the siganl detecting portion is formed so as to be thinner than the other portion by means of a buried layer. In this way, even with a same intensity of the input signal at the transducer, the loss of SAW is reduced and as the result the intensity of the detected signal is increased. By the present invention it is possible to increase the signal intensity at the detecting portion without changing characteristics of the filter portion.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile