Virtual array antenna with displaced phase centers for GMTI applications

Abstract

A novel multi-phase center reflector antenna is introduced for the Ground Moving Target Indicator (GMTI) applications. A single antenna is used to virtually make it more than one antenna by controlling the excitation modes of the dual-mode primary feed. First, the multi-mode primary feed is analytically modeled to study the concept in general. Then, the results are presented for the dual-mode stacked circular microstrip patch antenna placed at the focal point of an offset reflector antenna.