Flexible ultra-wideband (UWB) antenna arrays with band notching characteristics are proposed in this work. A new wideband and high-isolation Wilkinson power divider (WPD) is designed to construct the feed systems of the UWB antenna arrays. The proposed WPD is achieved by introducing a significant modification to the conventional WPD and the new one is composed of four isolation stages. Multiple stages helped to achieve wideband from 2GHz to more than 12GHz with high isolation characteristics of more than 20dB and insertion losses around 3.3dB. The designed WPD is then applied to feed two UWB monopole antenna arrays which offer a notched band centered at 5.5GHz to reject interference from wireless local area network (WLAN) system and can be integrated with curved surfaces. To verify the performance of the proposed structure, two array configurations are practically fabricated and measured. The results show that both the arrays have UWB operational bandwidth (3.5–11.8GHz for 1×2 array and 3.6–12GHz for 1×4 array) that includes the UWB spectrum. Attractive agreement between simulation and measurement results is obtained. Furthermore, the bending test is carried out on the 1×4 array showing the good performance of the proposed system when installed on curved surfaces for different bent angles.

中文翻译：

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用于 WLAN 应用的具有带阻特性的集成 Wilkinson 功率分配器馈电共形高增益 UWB 阵列天线的设计与分析

在这项工作中提出了具有带陷特性的柔性超宽带 (UWB) 天线阵列。一种新的宽带和高隔离威尔金森功率分配器 (WPD) 被设计用于构建 UWB 天线阵列的馈电系统。所提出的 WPD 是通过对传统 WPD 进行重大修改来实现的，新的 WPD 由四个隔离级组成。多个阶段有助于从 2 实现宽带GHz 到 12 以上GHz 具有超过 20 的高隔离特性dB 和 3.3 左右的插入损耗D b。然后将设计的 WPD 应用于两个 UWB 单极天线阵列，这些天线阵列提供以 5.5 为中心的陷波带GHz 可抑制来自无线局域网 (WLAN) 系统的干扰，并可与曲面集成。为了验证所提出结构的性能，实际制造和测量了两种阵列配置。结果表明，两个阵列都具有 UWB 工作带宽（3.5-11.8千兆赫为1×2数组和 3.6–12千兆赫为1×4阵列），其中包括 UWB 频谱。在模拟和测量结果之间获得了有吸引力的一致性。此外，弯曲试验是在1×4阵列显示了当安装在不同弯曲角度的曲面上时所提出系统的良好性能。