Liquid crystal-based reflective dual-band sub-terahertz phase shifter

A terahertz (THz) phase shifter based on a liquid crystal and a single-layer metasurface with a shared aperture for dual-band antennas is proposed. The device achieves phase shifts exceeding 180° in dual-frequency bands, with simulations indicating 236.8-248.8 GHz and 462-478 GHz ranges while experimental results demonstrate 239.3-249.4 GHz and 464-472.5 GHz operational bandwidths. Maximum phase shifts of 225.8° at 244.5 GHz and 201° at 468.3 GHz were experimentally recorded. The proposed metasurface is designed for use in a dual-band terahertz antenna system with shared aperture and phased array functionality.