Research On High-performance Metasurface Antennas And Arrays

With the continuous development of wireless communication systems,the requirements for antenna performance are getting higher and higher,and high-performance antennas such as the merits of broadband,high gain and low profile have become a development trend.As a two-dimensional metamaterial,the metasurface structure exhibits high-impedance resonance characteristics in a specific frequency band and in-phase reflection characteristics under incident plane waves.When the metasuface structure is used as a new type of radiation unit,thanks to its compact multi-unit arrangement,the entire radiation aperture can be fully excited to achieve broadband and high-efficiency directional radiation.Therefore,it is worthy to explore new high-performance metasurface antenna designs.This work is mainly focused on the researches of the application of metasurface structure in high-performance antennas.The details are as follows:1.The researches of basic characteristic of metasurface structure.The characteristics analysis of traditional metasurface structure and polarization-rotation metasurface structure are given respectively,and the parameter analysis which affects its reflection characteristics is given.2.The investigation of feeding method of metasurface antenna.The principle of slot feeding about microstrip line excitation and coplanar waveguide excitation are studied,and the design methods of feeding structures are analyzed respectively,consequently a series of broadband metasurface antennas based on these feeding structures are designed and implemented.3.The study of design method of high gain linearly-/circularly-polarized metasurface antenna array based on TE₂₂₀20 cavity.Firstly,the design of a low-loss feeding network of an antenna is explored,then a high-order cavity is proposed to replace the last stage of traditional feeding network,and a low-loss 4-channel power divider network based on TE₂₂₀20 cavity for an antenna array is developed.On this basis,the loading method of metasurface structure compact arrangement is studied,then the radiation aperture of the antenna is fully excited,and the non-periodic complemental boundaries technology is proposed,which greatly improves the uniformity of the aperture field distribution.As a result,two high-gain linearly-/circularly-polarized metasurface antenna arrays based on TE₂₂₀20 cavity are developed.These works have been respectively published in the IEEE Trans.Antennas Propag.and the 2017Asia-Pacific Conference on Antennas and Propagation?APCAP?.In addition,one invention patent in China has been also applied.4.The study of design method of metasurface antenna with integrated filtering function.A low-frequency filtering metasurface unit is constructed by etching a multi-folded U-shaped slot on the surface and an open-loop slot on the ground.Several parasitic patches are loaded in the same layer of the metasurface antenna to realize adjustable high-frequency filtering characteristic.Finally,based on the low-profile characteristics of the metasurface structure,the broadband and high-gain filtering metasurface antenna is designed and implemented.These work have been respectively published in the IEEE Trans.Antennas Propag.and the2018 Asia-Pacific Microwave Conference.