Holographic Imaging Based On Reflective Huygens Hypersurface

According to the classical electromagnetic theory,the size of microwave devices has a close relationship with the electromagnetic wave length.For the reflective medium,the high reflectivity medium usually has a large density,and the microwave wavelength is also large,which leads to the large quality of the electromagnetic wave mirror.In order to get enough phase difference,the thickness of the mirror will exceed the practical range.In recent years,artificial electromagnetic super surface is gradually applied to the design of electromagnetic wave control mirror in microwave,light and other frequency bands,which solves the problems that cannot be solved by classical electromagnetic theory.Based on this,by constructing a reflective Huygens hypersurface structure and setting a specific phase gradient,the digital holographic imaging of "H","I" and "t" is realized,which further verifies that the performance of the artificial electromagnetic surface is similar to or even better than that of the traditional mirror.In this paper,the literature analysis method and the simulation method are combined,mainly focusing on the design of the electromagnetic wave mirror based on Huygens surface to carry out theoretical analysis and simulation practice research.The main research content of this topic can be divided into two parts:,the first part of this thesis to huygens principle related theory research conducted in-depth analysis,on the basis of this,the surface of the huygens principle into the artificial electromagnetic unit in the design,through structure in artificial electromagnetic surface current and $magnetic flow in a certain way,the design unit with a specific phase regulation ability structure.In the second part,the design principle of the microwave segment holographic imaging algorithm is analyzed.By optimizing and improving the existing microwave segment holographic imaging algorithm,the digital holographic imaging algorithm is designed.Finally,the program and CST simulation software are used to realize the imaging of "H","I" and "T",and the theoretical control efficiency of 100% of the phase of the same polarization reflected electromagnetic wave is realized.This paper,by using the advantage of the reflective surface of the huygens unit structure,designed the holographic imaging surface,puts forward the design scheme of reflective huygens unit design,makes the electromagnetic control the thickness of the mirror and unit size is much smaller than the wavelength of the work,for the super surface design method of electromagnetic governor provides certain theoretical support and technical support.At the same time,the phase discontinuous artificial electromagnetic surface design method proposed in this paper uses only subwavelength resonant element to introduce the abrupt phase,which not only increases the degree of freedom of regulating electromagnetic waves,but also avoids the disadvantages of traditional devices and artificial electromagnetic media.Because of its small size,light weight and high flexibility,the phase discontinuous artificial electromagnetic surface will have great application potential in many aspects of electromagnetic wave regulation.