Liquid metal based metasurface for cross-band and ultra-wideband polarization conversion
In wireless communication,controlling electromagnetic wave propagation and polarization direc-tion is crucial for signal detection and reception.This study introduces a liquid metal-based electromagnetic metasurface for polarization conversion in the X(8-12 GHz)and Ku(12-18 GHz)bands.It offers benefits like ultra-wideband performance,high polarization conversion ratio,compactness,durability against me-chanical fatigue,flexibility,and affordability.The metasurface consists of a periodic arrangement with a top step-shaped liquid metal structure,a middle dielectric layer,and a bottom copper foil,capable of ultra-wideband cross-polarization conversion or wideband circular polarization conversion from 7.595 GHz to 17.712 GHz.With a 1.6 mm wide step-shaped liquid metal structure,it achieves over 90%polarization conversion ratio across 7.595-17.712 GHz with a 79.9%relative bandwidth,enabling co-polarization to cross-polarization conversion.At a 0.3mm structure width,it converts linear to circular polarization be-tween 10.864-12.288 GHz with a 12.30%relative bandwidth.Additionally,in the 7.328-7.592 GHz band with a 3.54%relative bandwidth,it maintains over 90%polarization conversion ratio,facilitating co-to cross-polarization conversion.Experimental sample tests reveal a 4.20%relative error between experimen-tal and simulated results,indicating strong theoretical and experimental correlation,thus confirming the metasurface's versatility and effectiveness.
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