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Circuit modeling of multiband high-impedance surface absorbers in the microwave regime

机译:微波条件下多频带高阻抗表面吸收器的电路建模

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In this paper, we present a simple circuit model to study the absorption of electromagnetic waves by a multilayer structure with a high impedance surface in the microwave regime. The absorber consists of a stack of two-dimensional arrays of sub-wavelength meshes or patches separated by dielectric slabs and backed by a metallic ground plane, with a single resistive sheet placed on the top layer. We observe the appearance of low-frequency resonances of total absorption, which have been identified as the resonances of Fabry-Peiot type associated with the individual reactively loaded dielectric slabs (that are strongly coupled through the subwavelength grids). It is shown that these resonances lie within certain characteristic frequency band defined by the structural parameters of the absorber. The observed resonances are characterized by studying the electromagnetic field behavior using the circuit model and full-wave numerical program. In addition, we show that the patch array absorber provides stable resonances with respect to the angle and the polarization of obliquely incident plane waves.
机译:在本文中,我们提出了一个简单的电路模型,以研究微波状态下具有高阻抗表面的多层结构对电磁波的吸收。吸收器由一堆由电介质板隔开并由金属接地层支持的亚波长网格或贴片的二维阵列堆叠而成,在其顶层放置了一个电阻片。我们观察到总吸收的低频共振的出现,这已被确定为与各个反应性加载的电介质平板(通过亚波长网格强烈耦合)相关的Fabry-Peiot型共振。结果表明,这些共振位于由吸收体的结构参数定义的某些特征频带内。通过使用电路模型和全波数值程序研究电磁场行为来表征观察到的共振。另外,我们表明,贴片阵列吸收器相对于倾斜入射平面波的角度和极化提供了稳定的共振。

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