| 摘要: |
| 针对传统传输超表面固有高Q值导致的工作频带窄的问题，提出了一种电、磁双模偏谐振阻抗匹配实现宽带传输超表面设计方法。建立了实现低损耗透波阻抗匹配的本征参数模型，并根据经典Drude-Lorentz模型分析了本征参数在电磁谐振与偏谐振区域的电磁特性。基于此，通过独立激励电、磁偏谐振模式，设计了满足宽频带阻抗匹配的本征参数电路模型。基于该模型，通过在超表面中引入金属微带线和平行贴片分别作为电、磁偏谐振器，调控结构的本征参数，从而在宽频带内实现所需本征参数条件。仿真和测试结果均证明，设计的超表面实现了双极化模式相对带宽为79.5%的3 dB传输带宽，且结构具有0°~40°的斜入射稳定性。该超表面具有超宽带、结构简单的特点，可应用于高性能天线罩设计中。 |
| 关键词: 传输超表面 偏谐振 本征参数 阻抗匹配 |
| DOI：10.20079/j.issn.1001-893x.220616002 |
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| 基金项目:国家自然科学基金资助项目（61871036） |
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| Broadband Transmission Metasurface Design Based on theMethod of Offset-resonance for Impedance Matching |
| ZHANG Xiao,LYU Qihao,JIN Cheng,TIAN Buning,YANG Kai |
| (1.China Academy of Space Technology,Beijing 100190,China;2.School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China) |
| Abstract: |
| 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. |
| Key words: transmissive metasurface offset-resonance constitutive parameters impedance matching |
