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. 19, 1991
Filed:
Jun. 13, 1989
Katsumi Ushiyama, Tokyo, US;
Sadafumi Sakamoto, Tokyo, US;
Giho Makino, Tokyo, US;
Kiyohiko Itoh, Sapporo, JP;
Kokusai Electric Co., Ltd., Tokyo, JP;
Abstract
A portable radio receiver assembled in a case. In accordance with the present invention, the case is also employed as an antenna of the portable receiver. The case is composed of a pair of parallel-opposed square conductor plates interposed therebetween a space sufficiently smaller than the wavelengths of received waves of the portable radio receiver, a frame of insulating material interposed in the space. Feeding terminals of the portable radio receiver are provided at desired positions on one pair of opposed sides of the parallel-opposed square conductor plates. Each of short-circuit elements of high-frequency-wise is provided on other pair of opposed sides of the parallel-opposed square conductor plates so that the direction of the plane of polarization of the antenna can be changed by short-circuiting any one of the short-circuit elements. A control circuit is provided in the case for selectively short-circuiting one of the short-circuit elements to obtain a larger received output from the feeding terminals.