Variable beamwidth antenna

Details Variable beamwidth antenna Variable beamwidth antenna

1974-08-27

1976-02-10

Borchelt, Archie R.

Communications: radio wave antennas

Antennas

Antenna with parasitic reflector

343837, 343912, 343915, H01Q 1912, H01Q 1514

Patent

active

039381625

ABSTRACT:
An antenna system for single or plural beams providing continuously variable beamwidth selectively in one or both of two orthogonal senses, i.e., azimuth and elevation, for either communications or angle-tracking. The system includes two parabolic cylindrical reflectors, which are respectively a main reflector and a sub-reflector; the reflectors are positioned with the focal axes thereof orthogonally. A point or multibeam (e.g., monopulse) feed is mounted adjacent the main reflector on the focal axis of the sub-reflector in the Airy disc of the system. Beamwidth is controlled using telescoping sections on the main and sub-reflectors to control the size of the surface areas thereof. Simultaneous operation of the telescoping sections of the reflector and sub-reflector provides bidirectional zooming of the beam without distortion while individual operation of the sections of the reflectors permits unidirectional zooming. Bidirectional zooming of beams from the multibeam feed requires rotating the position of the multibeam feed as the Airy disc changes during adjustment of the telescoping sections.

REFERENCES:
patent: 3254342 (1966-05-01), Miller
patent: 3365720 (1968-01-01), Kelleher
patent: 3852765 (1974-12-01), Bresler et al.
double Parobolic Cylinder Pencil-Beam Antenna, Spencer et al., IRE Trans.-Antennas and Propagation, Jan. 1955, pp. 4-8.

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