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

In this letter, a dual-band high-gain metasurface (MTS) antenna based on the symmetry-breaking effect is proposed for radar imaging. The top-layer MTS 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, 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 GHz to 8.7 GHz and 10.1 GHz to 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 multiband operation and high-resolution detection across diverse scenarios.