Research On Transparent Electromagnetic Protection And Polarization Converter Based On Printed Electronics Technolog

This paper studies the transparent electromagnetic protection technology based on printed electronic technology.Broadly speaking,electromagnetic protection includes electromagnetic shielding,absorption and electromagnetic stealth.The functional means include shielding,absorption,regulating the polarization direction of electromagnetic wave,reducing RCS and so on.In this paper,several practical transparent electromagnetic metamaterial structures are designed,and the performance of the designed transparent electromagnetic protection devices is verified through the cross comparison of theory,simulation and experiment.The main work of this paper is as follows:1、Based on the equivalent circuit theory and electromagnetic simulation software,this paper analyzes the quantitative law of electromagnetic shielding realized by single and double-layer metal silver wire grid structure,and proposes to use BP neural network algorithm to predict the electromagnetic shielding efficiency of single-layer metal grid,and this method can be used to quickly design the electromagnetic shielding structure of metal grid.Then,the electrostatic ink-jet printing technology of printing electronic technology is used to prepare high light transmission electromagnetic shielding optical window.Simulation and experimental verification show that the shielding efficiency can reach no less than 15 d B in the range of(0.3～12)GHz,and the transmittance of infrared light is more than 90%.2、Based on the absorbing mechanism of metal grid structure and impedance matching theory,a transparent broadband millimeter wave absorber is designed in this paper.Its absorptivity is more than 90% in the range of(72.4～110.0)GHz and its relative bandwidth is 35%,covering the whole W-band.Then the samples were prepared by printed electronic technology,and the simulation results were verified by experiments.Finally,the planar metal mesh structure is mapped to the undevelopable surface structure.Through the simulation research,it is found that the surface structure can reduce the radar cross section,which has potential application value for electromagnetic stealth.3、In this paper,a transparent broadband polarization converter based on parallel slash structure is designed.The simulation results show that its polarization conversion rate is more than 90% and the relative bandwidth is 53.0% in the frequency range of(70.92～122.04)GHz,covering the whole W-band.Then,based on this structure,a transparent polarization converter working in terahertz band is designed.Its polarization conversion rate is more than 90% in(0.251～0.533)THz band,and its relative bandwidth is 71.9%.This structure can show good polarization conversion performance when the incident angle is less than 30 °.