| 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。 |
| 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 |
| DOI： |
|
| 基金项目: |
|
| Radiation characteristic analysis of OAM antennas covered by radomes using PO-AI algorithm |
| WANG Qian,LIU Xiaochun,TIAN Junxia,ZHANG Wenwu |
| () |
| Abstract: |
| The Physical Optics-Aperture Integral (PO-AI) 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 literature. 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 influence 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. |
| Key words: orbital angular momentum (OAM) antenna radome physical optics-aperture integral (PO-AI) algorithm radiation characteristic analysis |
