Small Angular Beamwidth Antenna System.
DEPARTMENT OF THE ARMY WASHINGTON DC
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This invention relates generally to communications systems and more particularly to radio frequency communications trunk transmission systems in which antenna pattern cancellation arrangements are utilized to automatically eliminate or reduce external interference at the receiving end of the transmission communications link. As is well known and understood, one of the major concerns of designers of antenna system trunk transmission communications links is the elimination or reduction of external interference sources such as jamming and self-interference in a dense communications environment. Also as is well known, the beamwidth of the antenna is constrained by the allowable physical size of its aperture and most arrangements which attempt to resolve the problems of external interference do so in a relatively complex manner, often utilizing very large directional antennas or with antennas having hundreds or more elements to reduce the received beamwidth.
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation