Dual-polarized lens antenna based on multimode metasurfaces**Project supported by the Open Research Program of the State Key Laboratory of Millimeter Waves, China (Grant No. K201926), the Postgraduate Research & Practice Innovation Program of Jiangsu Province, China, and the Nanjing University of Posts and Telecommunications Scientific Foundation, China (Grant No. NY215137).

Abstract

We propose a dual-polarized lens antenna system based on isotropic metasurfaces for 12 GHz applications. The metasurface lens is composed of subwavelength unit cells (0.24λ0) with metallic strips etched on the top and bottom sides of the unit cell, and a cross-slots metallic layer in the middle that serves as the ground. The multimode resonance in the unit cell can realize a large phase shift (covering 0°–360°), and the total transmission efficiency of the lens is above 80%. The feed antenna at the focal point of the lens is a broadband dual-polarized microstrip antenna. Both the simulated and the measured results demonstrate that the dual-polarized lens antenna system can realize a gain of more than 16.1 dB, and an input port isolation of more than 25.0 dB.