Studying On Polarization-Independent Broadband Angular Selectivity

There are three basic attributes of space electromagnetic waves: frequency,polarization and propagation angle.Selecting electromagnetic waves according to these three attributes is the basic requirement for regulating electromagnetic waves.Over the past few decades,electromagnetic wave frequency and polarization selection technology have experienced tremendous development and have been widely used.In comparison,the development of electromagnetic wave angle selection technology is much slower,which greatly limits its important applications in many fields.The currently implemented wideband electromagnetic wave angle selection technology can only work on one kind of polarized wave,namely TM polarized wave.In this paper,based on the forbidden band effect of one-dimensional photonic crystals and the TE and TM polarized Brewster effect of anisotropic artificial magnetic materials,the design mechanism of TE polarized and fully polarized ultra-wideband angle-selective transparent structures is studied,and Simulation analysis and experimental verification were carried out.First of all,this paper describes the electromagnetic theory and numerical algorithm related to the content of this research,highlights the photonic crystal theory and the construction method of artificial electromagnetic materials,and derives the iterative algorithm for the reflection and transmission coefficients of multilayer anisotropic plates and under oblique incidence conditions Artificial electromagnetic material constitutive parameter inversion algorithm,and wrote related procedures,laid the theoretical and algorithm foundation for this article.Secondly,this paper introduces the design mechanism of the traditional TM polarized broadband angle-selective transparent structure,and puts forward the design idea of ??using magnetic anisotropic materials to construct the photonic crystal structure to realize the TE polarized broadband angle-selective transparent structure.In this chapter,we give the design method and simulation results of ultra-wideband magnetic anisotropic materials,and use the iterative algorithm of reflection and transmission coefficients of multi-layer anisotropic plates to obtain the angle selection effect of the ultra-wideband TE polarization angle selection transparent structure to verify the feasibility of the proposed method.Finally,we combined the TE and TM polarization angle selection transparent structuredesign ideas,put forward a method of using any electromagnetic angle anisotropy of artificial electromagnetic materials to achieve arbitrary polarization angle selection transparent structure,and through numerical calculation method is given Choose ultra-wideband full-polarization angles of 0° and 40°,respectively,and choose a transparent structure design.At the same time,we took the selection angle equal to 0° as an example,and made samples in the microwave frequency band to verify the principle of the above ultra-wideband polarized angle selection transparent structure design method.The experiment proved the feasibility and correctness of the proposed method.