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Generation of Millimeter-Wave Nondiffracting Airy OAM Beam Using a Single-Layer Hexagonal Lattice Reflectarray
IEEE Antennas and Wireless Propagation Letters ( IF 4.2 ) Pub Date : 2021-04-14 , DOI: 10.1109/lawp.2021.3073144
Yuhan Huang , Xiuping Li , Zaid Akram , Hua Zhu , Zihang Qi

In this letter, a millimeter-wave (mm-wave) nondiffracting Airy orbital angular momentum (OAM) beam is experimentally demonstrated by using a single-layer hexagonal lattice reflectarray based on an Airy-OAM-phase modulation method. To reduce the design time, a near-field synthesis technique is used to theoretically analyze the nondiffracting characteristics of the Airy OAM beam. A hexagonal dual-resonance element, composed of a hexagon ring around a square patch, is employed in the reflectarray to provide a linear phase range of 360 $^{\circ }$ . The proposed reflectarray with a diameter of 45 cm is designed at 47 GHz, which can reshape the incident wave according to the superposition phase of the desired Airy beam and OAM beam. To validate our design, a prototype is fabricated and measured. The measured results agree well with the theoretical and simulated ones. The experimental results show that an Airy OAM beam with the mode of $+$ 1 is successfully generated from 44 to 49 GHz. The nondiffracting propagation distance is greater than 2.5 m (392 $\lambda _0$ ). Moreover, the measured results validate the autofocusing and self-healing properties of the Airy OAM beam.

中文翻译:

使用单层六边形晶格反射阵列产生毫米波非衍射艾里 OAM 光束

在这封信中,通过使用基于艾里-OAM 相位调制方法的单层六边形晶格反射阵列,实验证明了毫米波(mm 波)非衍射艾里轨道角动量 (OAM) 光束。为了缩短设计时间,使用近场合成技术从理论上分析艾里 OAM 光束的非衍射特性。六边形双谐振元件由围绕方形贴片的六边形环组成,用于反射阵列中,以提供 360 度的线性相位范围 $^{\circ }$ . 所提出的直径为 45 cm 的反射阵列设计在 47 GHz,它可以根据所需的艾里光束和 OAM 光束的叠加相位对入射波进行整形。为了验证我们的设计,我们制造并测量了一个原型。实测结果与理论和模拟结果吻合良好。实验结果表明,具有模态的 Airy OAM 光束$+$ 1 从 44 到 49 GHz 成功生成。非衍射传播距离大于 2.5 m (392 $\lambda_0$ )。此外,测量结果验证了艾里 OAM 光束的自动聚焦和自愈特性。
更新日期:2021-06-04
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