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In this communication, radar cross section (RCS) reduction of Vivaldi antenna is achieved with structural modifications. This is realized by removing a portion of the metal from the radiator and implementing periodic slots adjacent to the radiating edge. These slots reduce the perpendicular reflections from the radiator, which causes reduction of the monostatic RCS. The proposed Vivaldi antenna operates from 4 to 12 GHz with 10 dB additional RCS reduction when compared with the reference Vivaldi antenna. The prototype is fabricated and its performance is validated using measurements.
Rajesh et al. (Thu,) studied this question.