Studies Of Metamaterial Antennas For The Vortex Electromagnetic Wave Communication

In recent years,as the demand of communications capacity has increased dramatically,the vortex electromagnetic wave communication are currently a hot research area because of its good orthogonal characteristic,where it can form a large number multiplexed channels,and greatly promoted spectrum utilization efficiency and communication capacity.In the vortex electromagnetic wave communication,The key problem is the antenna which can radiate high quality vortex electromagnetic wave.The vortex electromagnetic antenna which have high directional radiation pattern and high quality helical phase distribution,has become the focus of research because of the ability of the long distance transmission,recognition and multiplexing vortex electromagnetic wave,and the artificial electromagnetic Metamaterials will play an important role for its powerful ability of control electromagnetic waves.this thesis mainly studied Metamaterials antenna in the vortex electromagnetic wave communication,we generat vortex electromagnetic wave by using single reflector antenna and double reflector antenna based on metasurface.The concrete research content includes:1.we discussed the basic theory of orbital angular momentum,analysised the orthogonality among different modes vortex electromagnetic wave and the method of vortex electromagnetic wave multiplexing,introduced two mode detection methods of vortex electromagnetic wave,studied the character of vortex electromagnetic wave by simulation,and summarized the attenuation characteristics of vortex electromagnetic wave and the impact of antenna layout to vortex electromagnetic wave characteristics.2.our thesis studied the control principle of electromagnetic wave based on the generalized snell theorem,analysised the theoretical model of phase mutation metasurface,designed negative reflection plane mirror and collimating Convex mirror based on metasurface,analysised electromagnetic wave control effect,and the metasurface mirrors have been processed and measured.3.we designed vortex electromagnetic wave reflector antenna based on metasurface,studied the radiation characteristics and the phase mode,On this basis,designed vortex electromagnetic wave double reflector antenna,there are advantages of Smaller vertical dimensions and back-feed,and the performance of two antennas are compared and analyzed,and the double reflector antenna have been processed and measured.