A broadband folded reflectarray antenna (FRA) is presented employing a novel single-layer cross-polarization conversion (CPC) subwavelength element in this letter. The proposed element has a very simple structure and consists of only a square ring resonator loaded with two splits, thereby realizing easy fabrication with low cost. By varying the length of the ring and mirroring the element, a 360° phase change range is achieved with low losses at the center frequency. These characteristics make the proposed configuration unique, as most of the reported FRA elements rely on complex and multilayer structures to realize the broadband CPC. Furthermore, an FRA using the proposed elements is designed and measured at 22 GHz. A good agreement between the simulated and measured results is obtained. The measured results demonstrate that the proposed FRA realizes a 1 dB gain bandwidth of 20.9% and a maximum aperture efficiency of 47.8%.

中文翻译：

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单层交叉极化转换亚波长元件的宽带折叠式反射阵列天线

本文提出了一种采用新型单层交叉极化转换（CPC）亚波长元件的宽带折叠反射阵列天线（FRA）。所提出的元件具有非常简单的结构，并且仅由装载有两个缝隙的方形环谐振器组成，从而以低成本实现容易的制造。通过改变环的长度并镜像元件，可以实现360°的相位变化范围，并且在中心频率处的损耗很小。这些特性使所提出的配置具有独特性，因为大多数已报告的FRA元素都依赖于复杂的多层结构来实现宽带CPC。此外，使用建议的元件的FRA的设计和测量频率为22 GHz。在模拟结果和测量结果之间取得了良好的一致性。