宽带可折叠轨道角动量反射阵天线
Wideband Folded Orbital Angular Momentum Reflectarray Antenna

本文介绍了一款新型宽带可折叠轨道角动量反射阵天线。该天线主要包含三部分：第一部分是上层线极化栅格，它可以透过一种线极化波同时传输另一种与之正交的线极化波；第二部分是下层双极化轨道角动量反射阵面，它可以产生高增益轨道角动量涡旋电磁波，同时对馈源发出的线极化波起到极化扭转的作用，实现反射阵的折叠性能，降低反射阵天线的纵向剖面高度；第三部分是宽带馈源天线。为了验证本文设计的折叠轨道角动量反射阵性能，在HFSS中自动化建模仿真，通过仿真结果可以看出，该天线在54~66 GHz宽带范围内可辐射轨道角动量电磁波并获得20%的3-dB增益带宽，同时该天线相比于传统反射阵天线，其纵向高度缩减为原来的一半，实现了低剖面性能。本文设计的轨道角动量反射阵天线具有宽带、高增益以及低剖面性能，在通信、成像等平台具有潜在的应用价值。
This paper presents a new wideband foldable orbital angular momentum (OAM) reflectarray antenna. The antenna consists of three parts: The first part is the upper linearly polarized grid (LPG), which can transmit one linearly polarized wave through its orthogonal linearly polarized wave at the same time. The second part is the lower dual-polarized OAM reflectarray, which can generate high gain OAM vortex electromagnetic wave. It plays the role of polarization torsion on the linearly polarized wave emitted by the feed-source at the same time, so as to realize the folding performance of the reflectarray, which reduces the longitudinal profile of the reflectarray antenna. The third part is the wideband feed antenna. In order to verify the proposed folded OAM reflectarray performance in this paper, modeling and simulation were conducted in the ANSYS HFSS software. The simulation results show that the proposed antenna achieves OAM performance in the wide band range of 54~66 GHz and obtains 20% 3-dB gain bandwidth. Meanwhile, compared with the traditional reflectarray, the longitudinal height of the proposed antenna was reduced to half of the original, achieving low profile performance. Moreover, the proposed antenna in this paper has wideband, high gain and low-profile performance, and has potential application value in communication, im-aging and other platforms.