An Ultra-wideband Printed Antenna with Low Radar Cross Section

An ultra-wideband and low RCS (Radar Cross Section) printed antenna is designed and fabricated using the periodically loaded fractal complementary Frequency Selective Surfaces (FSS) on the upper patch and bottom ground plane, respectively. Simulated results show that the relative bandwidth of this novel antenna is significantly broadened from about 2.9% to about 140%, the RCS is reduced effectively to 25.15 dB, and the gain is maitained a high value within the entire band (3.9~22.1 GHz) compared to the original antenna. Experimental data show a reasonably good agreement between the simulation and measured results, and illustrate the validity of the method.