用剪裁透镜和剪裁反射器减小涡旋波的光束发散
Beam Divergence Reduction of Vortex Waves with a Tailored Lens and a Tailored Reflector
摘要：
在本文中，我们提出了一个定制的透镜和定制的反射器，以减少固有的大光束发散的轨道角动量波（OAM波涡旋波），产生的均匀圆形贴片天线阵列（UCA）在10 GHz。分别利用形状函数（5）和（9）设计了天线中心轴附近的裁剪透镜和裁剪反射器。将定制透镜与不具有和具有常规透镜的UCA进行比较。模拟和测量结果表明，使用定制的透镜时，显着的改善。以下，定制的反射器的实施和比较UCA没有和与传统的反射器。首先，采用外加场源模拟两个反射面，忽略了UCA的影响。对两种反射器的仿真结果表明，当反射器高度$r_0$小于1.5 $λ$，反射器开度θ小于38°（对于UCA，$d$为$λ/2$）时，定制反射器具有比常规反射器更好的性能。此外，反射器模拟与实际的UCA与不同形状的PCB，它可以干扰反射波从反射器。两个透镜和两个反射器的制造和测量在一个消声室，并与模拟结果进行比较。本文指出，涡旋波需要特殊的透镜或特殊的反射镜才能有效地减小光束发散，特别是当UCA半径很大时。
英文摘要：
In this paper, we present a tailored lens and a tailored reflector in order to reduce the large beam divergence inherent to Orbital Angular Momentum waves (OAM waves-Vortex waves) that are generated by an Uniform Circular Patch Antenna Array (UCA) at 10 GHz. The tailored lens and the tailored reflector are designed by the shape function (5) and (9) around the antenna s center axis, respectively. The tailored lens is compared to UCA without and with conventional lens. The simulated and measured results show a significant improvement when using the tailored lens. Following, a tailored reflector is implemented and compared to UCA without and with conventional reflector. Firstly, the two reflectors are simulated with an impressed field source to neglect the influence of the UCA. The simulated results of the two reflectors show that the tailored reflector has a better performance than the conventional reflector when the height of the reflector $r_0$ is less than around 1.5 $λ$ and when the opening angle of the reflector theta is less than 38° (for UCA with $d$ of $λ/2$). In addition, the reflectors are simulated with real UCA with different shapes of PCB, which can disturb the reflected waves from the reflector. Two lenses and two reflectors are manufactured and measured in an anechoic chamber and compared to the simulation results. This paper shows that the vortex waves needs a special lens or a special reflector to reduce effictively the beam divergence especially when the radius of the UCA is very large.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
