Research On The Modulation Of Amplitude,Phase And Polarization Of Electromagnetic Waves Based On Transmitted Metasurface

Metamaterials and metasurface have the ability to tailor electromagnetic waves.Passive metasurface structure has small size,light weight and low cost,which has a wide application space in the design of transmission antenna.When metasurface is combined with active devices such as varactor-diodes,it can realize real-time control of electromagnetic wave and beam scanning by adjusting external circuits.In this paper,the design of passive transmission metasurface and integrated reconfigurable transmission metasurface are studied by combining the transmission metasurface.The basic theory of metasurface and the related theory of transmission metasurface are mainly introduced.A transmission metasurface unit is designed,which can adjust the transmission amplitude and phase arbitrarily.Based on the amplitude and phase control ability of the unit,the transmission metasurface array with ultra-low sidelobe is obtained.The far-field radiation of four and eight beams are designed.The angle weighting of the radiation from different angles of the metasurface is realized.A transmission metasurface with controllable polarization and power ratio beam splitting was designed.Based on this unit,a metasurface transmission array with linear polarization incident and different polarization at a certain power ratio and different deflection angles was designed.Sample processing and far field dark chamber test were carried out on the designed array.A double inclined 45° polarization base station antenna is designed with varactric diode,which can realize the real-time independent phase reconfigurable function of 45° polarization and-45° polarization.Based on a power-dividing network and an eight point power dividing,two integrated double inclined 45° polarization base station antenna are designed.The two arrays can achieve beam scanning in different polarization respectively.