Design And Application Research Of Switchable Metasurface Radome

With the development of information technology,communication systems are being demanded for higher and higher performance.As a traditional device for protecting antennas,the microwave radome has gradually become a system component which is used to optimize the function of the antenna system.Metasurfaces have extraordinary electromagnetic characteristics,which can be used in the design of microwave radome and become an important approach to realize multi?functional radome.This paper studies and designs new metasurface structural units and are used to improve the performance of the radome.The main work of this paper is as follows:1.This paper introduces the equivalent circuit model used in the design and resonance analysis of metasurface structure unit,and the simulation steps of CST MWS based on complementary ring resonance unit.2.In this paper,a switchable metasurface radomes based on complementary diamond-ring-shaped resonators is proposed.It is shown that the metasurface has good frequency selection characteristics in the X-band,and its resonant frequency changes with the change of the rotation angle,through the CST MWS full-wave simulation analysis and experiments.The rotation angle is adjusted from o0°to 90°,the pass band frequency is switched from 11.0 GHz to 9.4 GHz.By analyzing the surface current distribution of the resonator,we find that the rotation angles of 900°and o0°correspond to different resonance modes,resulting in different equivalent capacitances changing the passband frequency.Most of these traditional radomes are not frequency switchable owing to their fixed structures.The existing frequency-adjustable radomes has a relatively complex structure and needs to be controlled by bias circuit,which is not conducive to integration and miniaturization.The structure of this switchable metasurface radome proposed in this paper is very sample and the control method is very easy,which provide a new approach for the design of switchable radomes.3.In this paper,a metasurface vortex wave radome with central symmetric structure is proposed to protect GPS circular antenna array with working frequency at 1.55GHz.Both the simulation analysis and the experimental measurement results show that the netasurface radome has good passband filtering performance at 1.55 GHz and maintains the stable propagation of the vortex wave,which can effectively protect the normal operation of the internal antenna array.The vortex electromagnetic wave has great potential in expanding the communication spectrum and improving the communication bandwidth,and thus has become a research hotspot in recent years.However,the related research of vortex wave radome has been blank.The work of this paper has done some exploratory research in this field.