Low Scattering Patch Array Antenna Based on Grooved Ground

A grooved metal ground with slits is utilized to achieve scattering cross-section (SCS) reduction of a microstrip patch array antenna in this paper. By arranging the grooves and slits on the ground, 180 scattering phase differences between the elements on the ground and in the grooves are attained on the aperture, and obvious SCS reduction is obtained in a broad band. The proposed low-SCS microstrip patch array antenna is fabricated and measured in an anechoic chamber. Experimental results show that the proposed array antenna can scan up to 60 in the E plane and 45 in the H plane within the band of 10~10.6GHz, and realizes a notable monostatic SCS reduction within the band of 7.8~13GHz.