Communications: radio wave antennas – Antennas – Slot type
Patent
1996-08-22
1999-03-02
Le, Hoanganh
Communications: radio wave antennas
Antennas
Slot type
343768, H01Q 1310
Patent
active
058777296
ABSTRACT:
A slot antenna having an elongated tube with a slot extending along the longitudinal axis of the tube provides an antenna structure for a wide-band communications antenna. The configuration of the tube and slot provide an antenna with an input impedance of about 50 ohms. A plurality of feed points are spaced along the slot for radiating and receiving wideband RF signals. When oriented vertically with respect to the earth, the antenna radiates and receives horizontally polarized signals with a high rejection of vertically polarized signals. When oriented horizontally with respect to the earth, the antenna radiates and receives vertically polarized signals with a high rejection of horizontally polarized signals. The antenna tube is coupled to a rectangular ground plane extending substantially the length of the antenna tube. The antenna provides high gain and, with the attached ground plane, provides a wide beamwidth greater than 180 degrees in the azimuth direction (when oriented vertically) or the elevation direction (when oriented horizontally). The plurality of feed points allow for an additional capability of beamsteering in the elevation direction (when oriented vertically) or the azimuth direction (when oriented horizontally).
REFERENCES:
patent: 2238770 (1941-04-01), Blumlein
patent: 2799017 (1957-07-01), Alford
patent: 2818565 (1957-12-01), Atioka et al.
patent: 4367475 (1983-01-01), Schiavone
Holloway Jesse Carol
Liechty Robert Blaine
Le Hoang-anh
Raytheon Company
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