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Orbital Angular Momentum (OAM) Mode-Reconfigurable Discrete Dielectric Lens Operating at 300 GHz
IEEE Transactions on Terahertz Science and Technology ( IF 3.2 ) Pub Date : 2020-09-01 , DOI: 10.1109/tthz.2020.2984451
Geng-Bo Wu , Ka Fai Chan , Shi-Wei Qu , Kin Fai Tong , Chi Hou Chan

A novel three-dimensional printed discrete dielectric lens (DDL) antenna with orbital angular momentum (OAM) mode reconfigurability operating at 300 GHz is proposed in this article. The antenna consists of a stationary lower DDL and an upper in-plane rotatable DDL, fed by a stationary pyramidal horn. The DDL pair can transform the quasi-Gaussian beam from the feed source into vortex waves, and its OAM mode number, l, can be dynamically reconfigured among 0, ±1, and ±2 by a simple mechanical in-plane rotation of the upper DDL panel with specific angles relative to the stationary lower one. For the DDL design, the height of each dielectric post pixel element is tuned to realize the required transmission phase. The OAM mode-reconfigurability of the proposed terahertz (THz) antenna was validated by both simulations and measurements. The simulated OAM mode purity bandwidth of the design DDL antenna are 40%, 31.3%, and 25.8% for the OAM mode l = 0, +1, and +2, respectively. In addition, the THz line-of-sight link experiments show that acceptable mode isolations among different OAM channels can be achieved by the THz DDL antenna, validating its application for OAM mode diversity.

中文翻译:

运行频率为 300 GHz 的轨道角动量 (OAM) 模式可重构分立介电透镜

本文提出了一种在 300 GHz 下运行的具有轨道角动量 (OAM) 模式可重构性的新型三维印刷离散介质透镜 (DDL) 天线。天线由一个固定的下部 DDL 和一个平面内可旋转的上部 DDL 组成,由固定的锥形喇叭馈电。DDL 对可以将来自馈源的准高斯光束转换为涡旋波,其 OAM 模式数 l 可以通过简单的机械平面内旋转在 0、±1 和 ±2 之间动态重新配置。 DDL 面板相对于固定的下部面板具有特定角度。对于 DDL 设计,每个介电柱像素元件的高度都经过调整,以实现所需的传输相位。所提出的太赫兹 (THz) 天线的 OAM 模式可重构性通过模拟和测量得到了验证。对于 OAM 模式 l = 0、+1 和 +2,设计 DDL 天线的模拟 OAM 模式纯度带宽分别为 40%、31.3% 和 25.8%。此外,太赫兹视距链路实验表明,太赫兹 DDL 天线可以实现不同 OAM 信道之间可接受的模式隔离,验证其在 OAM 模式分集上的应用。
更新日期:2020-09-01
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