The Application Research Of Electromagnetic Metasurfaces In 5G Millimeter Wave

Metasurfaces constitute a class of artificial composite structure or composite material constructed by a periodic or non-periodic arrangement of artificial printed elements with electrical dimension.These materials have some novel electromagnetic properties that cannot be achieved with the nature materials,and they are being paid more and more attention in the fields of electromagnetics,optics,materials science and microwave engineering.While benefiting from the characteristics of sufficient bandwidth,short wavelength and small interference,millimeter wave is becoming one of the key technologies of 5G.The main purpose of this thesis is to study the application research of electromagnetic metasurfaces in 5G millimeter wave.The main work includes the models of metasurfce waveguide are designed to verify the possibility and transmission characteristics of metasurfaces for supporting 5G millimeter wave;and the models of leaky-wave antenna and curved waveguide are designed,respectively.All application research will work in millimeter wave band,so 10GHz,28GHz and 60GHz are selected as working frequencies.Moreover,some numerical models are proposed and simulated by CST Microwave Studio,in order to numerically verify the rationality of application research.The main work of this thesis can be summarized as follows.Firstly,in the research of metasurface waveguide,verifying the possibility of metasurfaces for supporting the 5G millimeter wave from the view of mathematical analysis and physical characteristics.Medium waveguide is used as a reference in model design and different metasurfaces are printed in different regions.The high-index region of metasurface waveguide is a trip with an array of square patches and the bare substrate constitutes the low-index region as confinement boundaries.The simulation results show the metasurface wave is tightly confined in the metasurface waveguide.Secondly,in the research of slotted leaky-wave antenna based on metasurface waveguide,radiation principle of the leaky-wave antenna is analyzed and the principle and parameter selection of slot design are discussed.In model design,on the basis of metasurface waveguide,an array of uniform transverse slots are introduced to construct the leaky-wave antenna.The simulation results show that the main lobe of radiation is strong and the antenna gain is acceptable,so as to realize the aim of radiation millimeter wave.Finally,in the research of curved metasurface waveguide,loss mechanism of curved waveguide and some design methods to reduce energy loss are discussed.The design model of curved waveguide consists of two parts,one is straight part,design principle of which is the same to metasurface waveguide.The other is curved part,which is optimized by metasurfing.The simulation results show that the energy loss of optimized curved waveguide at the bend is well suppressed.