Multifunctional Dual-Band Metasurface-Based Transmit- and Reflect-Arrays at Sub-THz

In this paper, we present the design of a dual-band multifunctional metasurface-based (MMS) transmit- and reflect-array (TRA) antennas for wave manipulation at sub-terahertz (sub-THz). The proposed design allows independent beam control in both transmission and reflection hemispheres. The MMS exploits 1-bit phase control of the incident wave over a wide bandwidth while maintaining remarkably low insertion and reflection losses, using only three metallic layers. Passive dual-band TRA antennas, consisting of 30×30 unit-cells (UCs), are demonstrated based on the metasurface phase modulation capability. These features make the proposed MMS a highly promising solution for next-generation sub-THz applications, offering independent full space beamforming and steering coverage.