Research On Electromagnetic Control Technology Of Metamaterial Based On ITO

The characteristics of metamaterials have changed the traditional cognition of materials by mankind,creating a new material design concept,and providing a new way for the development of functional materials.By changing the shape,size and arrangement rules of its resonant structural units,the effective control of the equivalent electromagnetic parameters of artificial electromagnetic materials can be achieved in a specific frequency band,and then the electromagnetic waves can be customized,its wave absorption and polarization deflection characteristics have also attracted widespread attention.Existing electromagnetic shielding metamaterials are difficult to apply to electromagnetic shielding objects that need to be observed in the visible light band,such as liquid crystal screens,windows,and displays.This paper first introduces the absorption and polarization deflection mechanism and analysis methods of electromagnetic metamaterial absorbers,and studies the absorption and polarization deflection characteristics of several electromagnetic metamaterial structures in the microwave frequency band for incident electromagnetic waves.By optimizing the design-related structural parameters,the design of ultra-wide working frequency band electromagnetic shielding metamaterials with flexibility and transparency in the microwave frequency band is realized,and bidirectional adjustment of wave absorption and polarization deflection is realized.The main content includes the following three parts:(1)A flexible transparent wind-type electromagnetic artificial metamaterial broadband absorber based on resistive film ITO is designed.Based on the equivalent circuit model,the mechanism of electromagnetic wave absorption is analyzed.Numerical simulations have found that the surface impedance of the absorber in a wide bandwidth is approximately equal to the impedance in air,thereby achieving broadband absorption.At 15.373GHz-42.093 GHz,the absorption rate of incident electromagnetic waves reaches 90%,and the thickness is 1.4mm.(2)Based on the previous research on the absorber,this paper studies the influence of anisotropy and isotropic structure on the design of electromagnetic metamaterials,as well as the influence of dielectric constant and thickness on the absorber absorption performance.Then,a square split ring was designed with a structure containing a windmill model to achieve the effect of polarization deflection while achieving broadband absorption.In the range of 20.75GHz-54.05 GHz,the function of electromagnetic absorption of nearly 50% of the incident electromagnetic wave and electromagnetic wave of nearly 50% is realized,and the electromagnetic stealth performance of more than 94.5% of the incident electromagnetic waves in this working frequency band is realized,with a thickness of only 1.05 mm.(3)Through simulation software,the absorption mechanism of the two designed electromagnetic artificial metamaterials,the effects of equivalent impedance and dielectric constant on the electromagnetic control performance of the electromagnetic metamaterials are analyzed.The two electromagnetic artificial metamaterial samples were fabricated using micromachining craftsmanship,and the wave absorption and deflection properties were tested using its own spatial method.The test results were similar to the simulation results.And using ultraviolet-visible spectrophotometer to test it,it can be seen that in the visible light band,the light transmittance of the absorber sample is close to 75%,and the light transmittance of the electromagnetic artificial metamaterial sample controlled by two directions is close to 80%.Based on the flexibility and transparency,the electromagnetic adjustment of ultra-wideband electromagnetic waves is realized.