Antenna system with a limitable communication area

Details Antenna system with a limitable communication area Antenna system with a limitable communication area

1992-09-14

1994-08-09

Hajec, Donald

Communications: radio wave antennas

Antennas

With electrical shield

343793, 343700MS, H01Q 152, H01Q 1700

Patent

active

053370660

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.

REFERENCES:
patent: 3377593 (1968-04-01), Sansom
patent: 3501766 (1970-03-01), Crumpen
Dybdal, "Horn Antenna Sidelobe Reduction Using Absorber Tunnels", Institute of Electrical and Electronics Enginers AP-S Int. Symposium 1977, Stanford, Calif., pp. 324-327.

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