In this article, a class of wideband transmit arrays (TAs), composed of cascaded anisotropic impedance surfaces (AISs), for circularly polarized (CP) multibeam generation from a single feed horn are reported. The dispersionless phase compensation is achieved by the Berry phase (BP) via imposing a spatially dependent rotation angle on the TA unit cells. A homogenized model for the BPTA unit cell is proposed and utilized for obtaining a wideband response by tailoring the dispersive properties of the AIS layers. Two modeling methods, an analytical vectorial field analysis and a full-wave strategy incorporating the homogenized model, were employed to efficiently evaluate the performance of the BPTAs. In order to validate the proposed unit cell and the modeling methodologies, a Q-band single-beam BPTA is demonstrated, which achieves a peak gain of 30.2 dBi and a 1 dB bandwidth of 11.1% within which the axial ratio is smaller than 2 dB. Furthermore, by employing the intersection approach for pattern synthesis, several Q-band BPTAs supporting multiple concurrent symmetric/asymmetric CP pencil beams and circular-shaped flat-top beams are designed. A BPTA prototype for producing quad CP pencil beams with unequal gain values was fabricated and characterized, yielding good performance with an overall operational bandwidth of about 11%. The proposed BPTAs are promising candidates for point-to-multipoint communication and point-to-multiregional coverage in wideband millimeter-wave communications for wireless and satellite applications.

中文翻译：

---

基于各向异性阻抗面的宽带发射阵列，用于 Q 波段圆偏振单馈多波束生成

在本文中，报告了一类由级联各向异性阻抗表面 (AIS) 组成的宽带发射阵列 (TA)，用于从单个馈源喇叭生成圆极化 (CP) 多波束。无色散相位补偿是通过 Berry 相 (BP) 通过在 TA 单元上施加空间相关的旋转角来实现的。BPTA 晶胞的均质模型被提出并用于通过定制 AIS 层的色散特性来获得宽带响应。两种建模方法，一种分析矢量场分析和一种包含均质模型的全波策略，被用来有效地评估 BPTA 的性能。为了验证所提出的晶胞和建模方法，我们展示了 Q 波段单光束 BPTA，其峰值增益为 30。2 dBi 和 11.1% 的 1 dB 带宽，其中轴比小于 2 dB。此外，通过采用交叉方法进行模式合成，设计了几个支持多个并发对称/非对称CP笔形光束和圆形平顶光束的Q波段BPTA。制造并表征了用于产生具有不等增益值的四 CP 笔形光束的 BPTA 原型，产生了良好的性能，整体工作带宽约为 11%。拟议的 BPTA 是用于无线和卫星应用的宽带毫米波通信中点对多点通信和点对多区域覆盖的有希望的候选者。设计了几个支持多个并发对称/非对称CP笔形光束和圆形平顶光束的Q波段BPTA。制造并表征了用于产生具有不等增益值的四 CP 笔形光束的 BPTA 原型，产生了良好的性能，整体工作带宽约为 11%。拟议的 BPTA 是用于无线和卫星应用的宽带毫米波通信中点对多点通信和点对多区域覆盖的有希望的候选者。设计了几个支持多个并发对称/非对称CP笔形光束和圆形平顶光束的Q波段BPTA。制造并表征了用于产生具有不等增益值的四 CP 笔形光束的 BPTA 原型，产生了良好的性能，整体工作带宽约为 11%。拟议的 BPTA 是用于无线和卫星应用的宽带毫米波通信中点对多点通信和点对多区域覆盖的有希望的候选者。