Electrically controlled phased array OAM radar
Electrically controlled phased array OAM radar
复制标题
DOI：
10.1117/12.2559388
复制
发表时间：
2020-05
期刊：
影响因子：
--
通讯作者：
D. Orfeo;D. Burns;D. Huston;Tian Xia
中科院分区：
文献类型：
--
作者：
D. Orfeo;D. Burns;D. Huston;Tian Xia
轨道角动量 (OAM) 的控制为提高高性能微波系统的控制、灵敏度和安全性提供了潜力。 OAM 的特点是整数 OAM 模式，其中零表示平面波的情况。具有非零 OAM 模式的微波以螺旋波前传播。正交 OAM 模式可用于在相同频率和极化下承载不同的信息，从而提高数据速率。 OAM 波形还可以提高雷达对某些形状物体的检测能力。 OAM 可以通过通过空间相位板 (SPP) 电介质传播平面波来引起，这会引入方位角相关的相位延迟。然而，SPP 是频率特定的，这给在调频通信系统和宽带雷达中利用 OAM 带来了障碍。在这项研究中，我们开发了一种圆形相控阵来合成所需的涡旋形波前。这种方法提供了一个关键优势：所有天线元件的相位都可以在不同频率下轻松编程。因此，OAM 波束的发射和接收可以非常灵活地控制，使其可在较宽的频谱上运行，从而充分利用 OAM 雷达的功能和性能。在本文中，我们将研究具有 OAM 模式控制和信号处理功能的宽带雷达。
Control of orbital angular momentum (OAM) offers the potential for increases in control, sensitivity, and security for high-performance microwave systems. OAM is characterized by an integer OAM mode where zero represents the case of a plane wave. Microwaves with a nonzero OAM mode propagate with a helical wavefront. Orthogonal OAM modes can be used to carry distinct information at the same frequency and polarization, increasing the data rate. The OAM waveform may also increase radar detection capability for certain shaped objects. OAM can be induced by broadcasting a plane wave through a spatial phase plate (SPP) dielectric which introduces an azimuthally dependent phase delay. However, SPPs are frequency-specific, which presents an obstacle for harnessing OAM in frequency-modulated communication systems and wide-bandwidth radar. In this study, we develop a circular phased array to synthesize the desired vortex-shaped wavefront. This approach offers a critical advantage: the phases of all antenna elements are easily programmable under different frequencies. As a result, transmission and reception of the OAM beam can be controlled with great flexibility, making it operable over a wide frequency spectrum, which leverages OAM radar functionality and performance. In this paper, we will investigate a wide-bandwidth radar with OAM mode-control and signal processing.