Accession Number : ADD012955

Title :   Integrated Defense Communications System Antijamming Antenna System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Hannan,Peter W

Report Date : 16 Jun 1987

Pagination or Media Count : 14

Abstract : 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. 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.

Descriptors :   *PATENTS, *MONOPULSE RADAR, *MICROWAVE COMMUNICATIONS, *NULLS(AMPLITUDE), *ADAPTIVE SYSTEMS, *PROCESSING EQUIPMENT, *ANTIJAMMING, *RADOMES, *ANTENNAS, *SIDELOBES, *JAMMING, OUTPUT, CURVATURE, REFLECTORS, ISOLATION, AUXILIARY, ELEVATION, SIGNALS, INTEGRATED SYSTEMS, BEAMS(RADIATION), FEEDING, DATA LINKS, MICROWAVES, LAYERS, MULTIMODE, PATTERNS

Subject Categories : Countermeasures
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE