Accession Number : ADP007438

Title :   Beamspace Low Sidelobe Pattern Synthesis,

Corporate Author : RAYTHEON CO TEWKSBURY MA MISSILE SYSTEMS DIV

Personal Author(s) : Lawrence, Daniel J. ; Carey, W. T. ; Smolko, Joseph A.

Report Date : FEB 1992

Pagination or Media Count : 20

Abstract : Modern antenna applications typically require simultaneous low sidelobe receive sum and difference patterns. One method of achieving low sidelobes is presented and involves the optimal combination of full-aperture beams. This method consists of calculating weights that optimize power over a simultaneously formed set of full gain beams (basis beams) in a selected far-field region. A single low sidelobe composite pattern is formed from the basis beams by this optimally weighted beam combination. When these weights are applied digitally, simultaneous receive sum and difference composite beams can be formed to provide monopulse functions. The most interesting result is the formation of low sidelobe level difference patterns. Simulated results show that under -50 dB rms sidelobe level sum and difference patterns (relative to the peak of the beams) can typically be realized by a five beam cluster of uniformly illuminated beams. Simulations are also provided that show response over frequency.

Descriptors :   *ANTENNAS, APERTURES, FAR FIELD, FREQUENCY, FUNCTIONS, GAIN, MODEMS, PATTERNS, POWER, REGIONS, RESPONSE, SIDELOBES, SIMULATION, WEIGHT, BEAMS(ELECTROMAGNETIC).

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE