电磁偏谐振阻抗匹配宽带传输超表面设计OACSTPCD

Traditional transmissive metasurfaces usually have narrow bandwidths due to their inherently large quality factor(Q-value).In this paper,a technique of electric and magnetic dual-mode offset-resonance is proposed to broaden the operating band of transmissive metasurface.The constitutive parameters are firstly modeled to achieve low-loss and broadband transmission.Then,the electromagnetic properties of the constitutive parameters in the resonant and offset-resonant regions are analyzed.Based on these properties,a circuit model satisfying the required condition over a broad band is designed by independently exciting the electric and magnetic offset-resonance.Finally,based on such a circuit model,metallic microstrip and parallel-patches are introduced into the transmissive metasurface as electric and magnetic offset-resonators respectively,thereby manipulating the structural constitutive parameters to achieve the desired values in a broad band.Both the simulated and measured results demonstrate that the designed metasurface exhibits a 3 dB transmission band with a fractional bandwidth of 79.5%for dual-polarization.In addition,the realized broadband performance is with stable angular response from 0° to 40°.The designed transmissive metasurface with broadband transmission and simple structure can potentially be applied in the design of high-performance radome.