EHF Key Laboratory of Science, School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan, 611731, P. R. China.
Sci Rep. 2017 Feb 9;7:41726. doi: 10.1038/srep41726.
A two-dimensional (2D) diffraction model for the calculation of the diffraction field in 2D space and its applications to terahertz parallel-plate waveguide power splitters are proposed in this paper. Compared with the Huygens-Fresnel principle in three-dimensional (3D) space, the proposed model provides an approximate analytical expression to calculate the diffraction field in 2D space. The diffraction filed is regarded as the superposition integral in 2D space. The calculated results obtained from the proposed diffraction model agree well with the ones by software HFSS based on the element method (FEM). Based on the proposed 2D diffraction model, two parallel-plate waveguide power splitters are presented. The splitters consist of a transmitting horn antenna, reflectors, and a receiving antenna array. The reflector is cylindrical parabolic with superimposed surface relief to efficiently couple the transmitted wave into the receiving antenna array. The reflector is applied as computer-generated holograms to match the transformed field to the receiving antenna aperture field. The power splitters were optimized by a modified real-coded genetic algorithm. The computed results of the splitters agreed well with the ones obtained by software HFSS verify the novel design method for power splitter, which shows good applied prospects of the proposed 2D diffraction model.
本文提出了一种用于计算二维（2D）空间衍射场的二维（2D）衍射模型及其在太赫兹平行板波导功率分配器中的应用。与三维（3D）空间中的惠更斯-菲涅尔原理相比，所提出的模型提供了一种计算 2D 空间衍射场的近似解析表达式。将衍射场视为 2D 空间中的叠加积分。所提出的衍射模型的计算结果与基于元素方法（FEM）的软件 HFSS 的计算结果吻合良好。基于所提出的 2D 衍射模型，提出了两种平行板波导功率分配器。这些分配器由发射喇叭天线、反射器和接收天线阵列组成。反射器为圆柱形抛物面，叠加了表面浮雕，可有效地将发射波耦合到接收天线阵列中。反射器用作计算机生成的全息图，以将变换后的场与接收天线孔径场匹配。通过改进的实编码遗传算法对功率分配器进行了优化。分配器的计算结果与通过软件 HFSS 获得的结果吻合良好，验证了功率分配器的新颖设计方法，表明所提出的 2D 衍射模型具有良好的应用前景。
