This paper presents a new ultra‐wideband (UWB) antenna system with circular polarization (CP). The antenna is a coplanar waveguide (CPW) feed structure with a modified inverted L‐shaped radiating patch. A single‐layer non‐uniform frequency selective surface (FSS) composed of rectangular conductive patches is designed and used with the CP antenna to improve the CP characteristics and the gain of the antenna. According to the measured results, the 10 dB return‐loss bandwidth of the antenna with the FSS extends from 3.7 to 11.1 GHz. The 3‐dB measured axial ratio (AR) bandwidth is 58.15%, covering 5 to 9.1 GHz, and the measured peak gain is 4–9.4 dBi, showing an increase of about 3 dBi compared to the antenna without the FSS.

中文翻译：

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使用FSS增强宽带圆极化UWB天线的增益

本文介绍了一种新的具有圆极化（CP）的超宽带（UWB）天线系统。天线是共平面波导（CPW）馈电结构，具有改进的倒L形辐射贴片。设计了由矩形导电贴片组成的单层非均匀频率选择表面（FSS），并将其与CP天线一起使用，以改善CP特性和天线增益。根据测量结果，带有FSS的天线的10 dB回波损耗带宽从3.7 GHz扩展到11.1 GHz。3 dB测得的轴向比率（AR）带宽为58.15％，覆盖5至9.1 GHz，测得的峰值增益为4–9.4 dBi，与没有FSS的天线相比，增加了约3 dBi。