A 1 bit Reflective Metasurface for Generating OAM Waves Based on Linear Polarizer
This paper presents a novel 1 bit reflective metasurface to generate orbital angular momentum (OAM) waves in radio frequency domain. The metasurface unit cell is based on a wideband linear polarizer, which consists of a single layer substrate with top polarization rotating patch (PRP) and bottom metallic ground. The proposed unit cell and its mirror image can maintain a stable 180deg phase difference over a wide bandwidth of 18 36 GHz. Thus, 1 bit phase quantization is obtained by using this property. Based on the linear polarizer, a 1 bit reflectarray for generating +1 mode OAM waves is designed and simulated. The simulated results show that +1 mode OAM vortex electromagnetic waves are successfully generated and a small divergence angle of 4deg is obtained, with a high gain of 19.2 dBi at 27 GHz.
2019 International Symposium on Antennas and Propagation (ISAP)