应用PO-AI方法分析加罩OAM天线的辐射特性  

Radiation Characteristic Analysis of OAM Antennas Covered by Radomes Using PO-AI Algorithm

作　　者：王茜[1,2] 刘晓春 田俊霞[1,2] 张文武 

机构地区：[1]中国航空工业集团公司济南特种结构研究所,济南250023 [2]高性能电磁窗航空科技重点实验室,济南250023

出　　处：《电讯技术》2018年第2期197-203,共7页Telecommunication Engineering

摘　　要：应用物理光学-口面积分(PO-AI)方法,数值分析加载天线罩的轨道角动量(OAM)波天线的辐射特性,评判介质天线罩对各阶模式OAM波的辐射特性、幅相分布以及模式纯度的影响程度。通过与现有文献中天线罩实例的测试值相对比,验证了算法的正确性和有效性;考察了开口波导环形阵列OAM波天线工作于不同的模式阶数时,半球形天线罩所引起的空间场幅-相分布的变化。在此基础上,计算了一个正切卵形、多层介质天线罩情况,验证了PO-AI算法对复杂结构的适应性。从数值结果可见,天线罩对高阶OAM辐射波的幅值分布影响较大。数值计算也证实该算法可以快速预估介质罩存在时OAM波形的畸变程度,有助于实现对天线罩各参数的快速优化。The Physical Optics-Aperture Integral （PO-A I） algorithm is employed to analyze the radiation property of an antenna generating the Orbital Angular Momentum （OAM） waves covered by a radome. The influence of the radome on the radiation properties, amplitude-phase distribution,and the purity of each OAM wave mode is estimated using the PO-AI algorithm. The accuracy and the efficiency of the algorithm are verified by the comparison of the PO-AI results with the experimental data provided by an available l i t-erature. The variations in the amplitude-phase distribution of a circular open-ended waveguide array with different OAM mode orders caused by a hemispherical radome are investigated. On this basis, an ogive shaped radome with multilayer dielectric wall is analyzed,validating the flexibility of the PO-AI algorithm for more complex geometries. The numerical results show that the simulated radomes exert their more influ-ence on the amplitude distribution of higer order OAM wave modes. The numerical simulation also verifies that the PO-AI algorithm can predict the OAM wave distortion by the radomes with fast operational speed, contributing to the high-efficiency optimization of radome parameters.

关 键 词：轨道角动量(OAM)天线 天线罩 物理光学-口面积分(PO-AI)算法 辐射特性分析 

分 类 号：TN011[电子电信—物理电子学]