In this letter, a closed-loop cross-dipole antenna array (CLCDAA) is proposed for wideband orbital angular momentum (OAM) communication. The proposed antenna array is designed based on a closed-loop cross dipoles patch, several pillow-like parasitic patches, and a hybrid wideband feeding network. The design method of the feeding network is introduced using the analysis of the multiport network, and the good performance of this feeding network is verified. A prototype CLCDAA is fabricated and measured to validate the design concept. The OAM beams can cover a wide frequency band from 2.08 to 3.95 GHz (62.02%), and the simulation and measurement results are in good agreement. Benefiting from a compact structure, simple design procedure, and steady performance, the proposed antenna array has a significant meaning in the application of wireless communications.

中文翻译：

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用于宽带OAM通信的闭环交叉偶极天线阵列

在这封信中，提出了用于宽带轨道角动量 (OAM) 通信的闭环交叉偶极子天线阵列 (CLCDAA)。所提出的天线阵列是基于闭环交叉偶极子贴片、几个枕状寄生贴片和混合宽带馈电网络设计的。通过对多端口网络的分析，介绍了馈电网络的设计方法，验证了该馈电网络的良好性能。制造和测量原型 CLCDAA 以验证设计概念。OAM波束可以覆盖2.08~3.95GHz（62.02%）的宽频带，仿真和测量结果吻合良好。结构紧凑，设计流程简单，性能稳定，