Single-layer dual-frequency dual-polarized transmit-reflect-array based on coding metasurface

To address the issues of complex structure, single function, and limited spatial coverage in traditional reflectarray and transmitarray antennas, a single-layer dual-frequency dual-polarized integrated transmit-reflect-array antenna is proposed based on a coding metasurface. By reasonably arranging high-frequency and low-frequency meta-atoms, the designed array can realize independent transmission and reflection beams with different linear polarizations. Utilizing the proposed metasurface structure, two transmit-reflect array antennas are designed, which both consisting of 18×18 high-frequency elements and 19×19 low-frequency elements. Both antennas possess the same center frequencies for the high and low bands, of which are 35 GHz and 29 GHz, respectively. The first antenna generates a forward x-polarized high-gain beam at θ=20° in the high-frequency band and a backward y-polarized high-gain beam at θ=0° in the low-frequency band, achieving peak gains of 24.6 dB and 25.3 dB in the transmission and reflection modes, respectively. The second antenna radiates a forward x-polarized vortex beam at θ=0° in the high-frequency band and a backward y-polarized high-gain beam at θ=−30° in the low-frequency band, obtaining peak gains of 24.4 dB and 19.3 dB in the transmission and reflection modes, respectively. Under the premise of a single-layer structure, two proposed transmit-reflect array antennas achieve full spatial coverage of radiation beams. Featured by simple structure, high integration, wide coverage, and high gain, they have broad application prospects and development potential in long-distance information transmission systems such as satellite communications and radar detection.