Research And Design Of Antenna Based On Metasurface

With the update and iteration of wireless communication system,the performance requirements of antenna are higher and higher,and the requirements of application scenarios are also more and more.Metasurface（Metasurface）is a two-dimensional form of metamaterials.It has the characteristics of low profile,easy processing and easy integration.It can also arbitrarily adjust the amplitude,phase and polarization of electromagnetic waves.Therefore,the introduction of metasurface in the research and design of antenna can meet the needs of the development of wireless communication system.In recent years,many achievements have been made in the research of metasurface antenna,such as reducing the electrical size of the antenna,improving the impedance matching of the antenna,reducing the RCS of the antenna and so on.However,the performance of the metasurface antenna can be further improved,and the application scenarios can continue to expand.This paper mainly studies and designs three different types of metasurface antennas.Different metasurface arrays are used to improve the performance of the three antennas and expand the application scenarios of the antenna.The specific design process and research results are as follows:1.A wideband Fabry-Perot resonator antenna loaded with circularly polarized metasurface is designed.Firstly,the working principle of the traditional Fabry-Perot resonator antenna is studied and analyzed.Then,according to the wideband resonance condition of Fabry-Perot resonator antenna,a new type of partial reflection surface is designed.This part of the reflection surface can not only make the slope of the reflection phase curve positive and broaden the-3d B gain bandwidth of the antenna,but also convert the linear polarization wave into circular polarization wave.The final simulation results show that the operating frequency range of the antenna is 9.6GHz-10.4GHz,and the maximum gain in this range is 12.7d Bi.2.A miniaturized wideband H-plane SIW horn antenna based on metasurface is proposed.Firstly,the working principle of traditional H-plane SIW horn antenna is studied and analyzed.Then,the upper and lower metal horn wide walls of the traditional SIW horn antenna are replaced by periodic metasurface elements.According to the impedance adjustment characteristics of the metasurface,the impedance between the feed and the aperture is more matched,so as to broaden the working bandwidth of the H-plane SIW horn antenna.Compared with other wideband H-plane SIW horn antennas,this antenna doesn’t need additional substrate at the aperture.While maintaining a low profile,the size of the antenna is reduced.Finally,the antenna is processed and tested.The size of the antenna is 2λ₀×2.33λ₀×0.13λ₀.The test results show that the working frequency range of the antenna is 21.5GHz-28GHz,the relative bandwidth is 26.3%,and the maximum gain in the operating frequency range is 10.7d Bi.3.A wideband circularly polarized pattern diversity antenna loaded with metasurface is designed.Firstly,the pattern diversity antenna is studied and analyzed.Then,a novel metasurface array is designed with the characteristic mode analysis（CMA）.Using the four modes of the array,the antenna can obtain the diversity of wide broadside and conical patterns while radiating circularly polarized waves.Compared with other circularly polarized pattern diversity antennas,this antenna has a wider frequency range and can meet the needs of modern mobile wireless communication system.Finally,the antenna is processed and tested.The test results show that the common working frequency range of the two different patterns of antenna radiation are 4.23GHz-4.75GHz,and relative bandwidth is11.6%,which is little different from the simulation results.