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:
Aug. 09, 1994
Filed:
Sep. 14, 1992
Applicant:
Inventors:
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01Q / ; H01Q / ;
U.S. Cl.
CPC ...
343841 ; 343793 ; 3437 / ;
Abstract
An antenna system, comprising an antenna for transmitting a radio wave of a frequency, and a radio wave absorber intercepting and absorbing part of the radio wave to reduce the gain of the antenna. Thereby, the antenna system narrows down the communication area of the radio wave independently of the frequency. The antenna system is applicable to a movable object discriminator using a radio wave.