A dual stop band Frequency Selective Surface (FSS) in windmill-liked shape is proposed, which achieves wide Rader Cross Section (RCS) reduction by applying FSS on the ground of the dualband microstrip antenna. Each corner of the FSS is formed by combining two semi-suqares which have 90° of rotation between each semi-square. The dual stop bands are the results of the resonance of the electric dipole and the higher order mode effect. The simulation and measurement results show that the gain of E plane and H plane at 5.20 GHz is maintained, while the gain of E plane and H plane at 10.41 GHz are increased by 1.8 dBi, simultaneously. The antenna’s monostatic RCS reduction is obviously observed in a wide frequency band ranging from 1.0 GHz to 16.8 GHz. What’s more, the maximum value is 28.3 dB under x polarization and 36.2 dB under y polarization, respectively.
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