Dual-Band High-Gain Metasurface Antenna Based on Symmetry Breaking Effect for Radar Imaging

In this paper, a dual-band high-gain metasurface antenna based on the symmetry breaking effect is proposed for radar imaging. The top-layer metasurface comprises a central rectangular patch and triangular patches, while the feed structure includes a microstrip line and a ground slot. By introducing the symmetry breaking effect (SBE), radiation blind zones are eliminated, and the T-shaped feedline excites a half-slot full-wavelength resonance mode in the drum-shaped slot, enabling dual-band operation. A 2×2 antenna array achieves bandwidths of 7.5–8.7 GHz and 10.1–12.2 GHz, with peak gains of 13.9 dBi and 11.9 dBi. The proposed antenna offers a compact, high-performance solution for dual-band operation, particularly suited to radar imaging systems requiring multi-band operation and high-resolution detection across diverse scenarios.