Adaptive Nulling by Electrical Surface Control of a Reflector Antenna

Period of Performance: 01/01/1987 - 12/31/1987

$487K

Phase 2 SBIR

Recipient Firm

Csi, Inc.
1280 Clearmont St NE
Palm Bay, FL 32905
Principal Investigator

Abstract

PHASE I OF THIS PROJECT HAS SHOWN THAT IT IS FEASIBLE AND DESIRABLE TO FORM NULLS USING REFLECTIVE ELEMENTS MOUNTED ON THE SURFACE OF CONVENTIONAL REFLECTOR ANTENNAS. PHASE II CONTINUES THE DEVELOPMENT. THE REFLECTIVE ELEMENTS ARE TYPICALLY (THOUGH NOT NECESSARILY) GROUPED INTO CLUSTERS ON THE REFLECTOR SURFACE. THE REFLECTIVE PHASE OF EACH ELEMENT IS CONTROLLABLE SO THAT THE TOTAL SECONDARY FIELD OF THE ANTENNA IS CONTROLLABLE. SINGLE AND MULTIPLE NULLS CAN BE FORMED RAPIDLY. THE CLUSTERS CAN BE ADDED TO EXISTING OR NEW ANTENNAS AT CONSIDERABLY LESS COST AND BETTER PERFORMANCE (LESS LOSS) THAN PHASED ARRAYS. EXTENDED APPLICATIONS IN ADDITION TO NULL STEERING INCLUDE SURFACE DISTORTION CORRECTION, RAPID BEAM STEERING, AUTOTRACKING, BEAM SHAPING, AND LOW RADAR CROSS SECTION ANTENNAS. PHASE I HAS SHOWN FEASIBILITY THROUGH ANALYSIS AND SIMULATIONS. PHASE II PROVIDES THE PERFORMANCE BOUNDS THROUGH ANALYSIS AND EXPERIMENTS.