Aladadi Yosef T, Alkanhal Majeed A S
Department of Electrical Engineering, King Saud University, Riyadh 11421, Saudi Arabia.
Micromachines (Basel). 2021 Sep 16;12(9):1114. doi: 10.3390/mi12091114.
This paper presents a full electromagnetic (EM) characterization of metallic lenses. The method is based on the utilization of free-space transmission and reflection coefficients to accurately obtain lenses' tensorial EM parameters. The applied method reveals a clear anisotropic behavior with a full tensorial directional permittivity and permeability and noticeably dispersive permeability and wave impedance. This method yields accurate values for the effective refractive index, wave impedance, permittivity, and permeability, unlike those obtained by simple methods such as the eigenmode method. These correct cell parameters affect their lens performance, as manifested in a clear level of anisotropy, impedance matching, and losses. The effect of anisotropy caused by oblique incidence on the performance and operation of lens designs is illustrated in a lens design case.
本文介绍了金属透镜的完整电磁（EM）特性。该方法基于利用自由空间传输和反射系数来精确获取透镜的张量电磁参数。所应用的方法揭示了一种明显的各向异性行为，具有完整的张量方向介电常数和磁导率，以及明显的色散磁导率和波阻抗。与通过本征模方法等简单方法获得的值不同，该方法能得出有效折射率、波阻抗、介电常数和磁导率的准确值。这些正确的单元参数会影响透镜性能，表现为明显的各向异性、阻抗匹配和损耗水平。在一个透镜设计案例中展示了斜入射引起的各向异性对透镜设计性能和操作的影响。
