基于反射式 Pancharatnam-Berry 相元表面的超宽带毫米波涡旋光束生成技术

Tingting Zhang;Xuehong Sun;Yanpeng Zhang;Liping Liu
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引用次数: 0

摘要

由于频谱资源逐渐稀缺,人们不断提出并发展轨道角动量(OAM)技术,以拓宽信道容量。为解决这一问题,一些工作在毫米波段的超宽带反射相位元面天线被设计用来产生携带 OAM 的高纯度涡旋波。基于 Pancharatnam-Berry (PB) 相概念,单元结构由元表面、介质、金属接地层组成。通过对单元结构参数的优化设计,在覆盖 2π 旋转相位时,反射波效率高达 95%,实现了 PB 相位概念的基本要求和 116% 的相对带宽。然后,根据涡旋波产生公式和相位补偿原理布置元表面阵列。在 25 GHz 至 35 GHz 的宽频带内,分别产生了整数(l = ±1、±2、±3)十进制(l = ±1.5)和高模(l = ±8)OAM 涡束。OAM 纯度分析表明,该天线可在宽频带范围内产生高纯度毫米波 OAM 波束,最大增益可达 23.6 dBi。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ultra-Wideband Millimeter-Wave Vortex Beam Generation Based on Reflective Pancharatnam-Berry Phase Metasurface
Due to the gradual scarcity of spectrum resources, orbital angular momentum (OAM) technology has been proposed and developed continuously to broaden channel capacity. To solve this problem, some ultra-wideband reflective phase metasurface antennas working in millimeter band are designed to generate high purity vortex waves which carry OAM. Based on the Pancharatnam-Berry (PB) phase concept, the unit cell is composed of a metasurface, dielectric, metal grounding layer. Through the optimization design of the unit structure parameters, the reflected wave efficiency can be as high as 95% when covering 2π rotating phase, which realizes the basic requirements of PB phase concept and the relative bandwidth of 116%. Then the metasurface arrays are arranged according to vortex wave generation formula and phase compensation principle. In the 25 GHz to 35 GHz frequency wide band, integer (l = ±1, ±2, ±3) decimal (l = ±1.5) and high-mode (l = ±8) OAM vortex beams are generated, respectively. The OAM purity analysis shows that the antennas can generate millimeter wave OAM beams with high purity in a wide band range, and with a maximum gain of up to 23.6 dBi.
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