Communications: directive radio wave systems and devices (e.g. – Directive – Including directive communication system
Patent
1984-09-25
1987-06-16
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including directive communication system
343779, 343781P, 342150, 342 15, H04K 300, H01Q 2504, H01Q 1919
Patent
active
046739432
ABSTRACT:
The isolation of mainbeam and sidelobe jamming signals from the desired signal being relayed by microwave communication links is accomplished by an antijamming antenna comprising a flat radome, a curved reflector and a transmit dipole. Positioned adjacent the dipole is a monopulse feed and comparator for main-beam jammers (dual-plane monopulse, multi-mode multilayer feed). Also forming part of the integrated antenna are auxiliary units for near-sidelobe and far-sidelobe jammers. An alternative embodiment includes a Cassegrain grating sub-reflector. Since the direction of the desired incoming signal in microwave communication links is precisely known, the antijamming antenna uses azimuth and elevation monopulse to make a spatial distinction between the desired incoming signal and the jamming signals. The antijamming antenna system outputs: a sum, azimuth difference elevation difference signals and isolated near-sidelobe jamming signals and far-sidelobe jamming signals on output ports which allow an adaptive processor to place pattern nulls on jammers located in the mainbeam and sidelobe region of the antenna.
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Auton William G.
Barron Jr. Gilberto
Blum Theodore M.
Singer Donald J.
The United States of America as represented by the Secretary of
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