Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1989-06-13
1991-03-19
Kuntz, Curtis
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455269, 343702, 343700MS, H01Q 138
Patent
active
050017780
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.
REFERENCES:
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patent: 4791423 (1988-12-01), Yokoyama et al.
patent: 4803491 (1989-02-01), Hikuma
patent: 4829591 (1989-05-01), Hashimoto et al.
patent: 4876552 (1989-10-01), Zakman
Itoh Kiyohiko
Makino Giho
Sakamoto Sadafumi
Ushiyama Katsumi
Burns Robert E.
Kokusai Electric Co. Ltd.
Kuntz Curtis
Lobato Emmanuel J.
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