A new compact wideband circularly polarized (CP) antenna is proposed in this work. The antenna consists of a CP square-loop with sequential phase (SP) characteristics, four strip-lines as driven elements, four L-shaped patches with I-slots and four I-shaped patches as parasitic elements. The square-loop is utilized to feed the two pairs of parasitic patch arrays by a capacitively coupled way. The proposed antenna has a broad 3-dB axial ratio bandwidth (ARBW) of 18.9% (6.35 GHz, 5.75-6.95 GHz), and a wide 10-dB impedance bandwidth (IBW) of 23% (6.38 GHz, 5.65-7.12 GHz). Besides, the presented antenna features flat gain within the CP operation bandwidth and compact structure.

中文翻译：

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具有多种模式的宽带圆极化微带天线

这项工作中提出了一种新的紧凑型宽带圆极化（CP）天线。该天线由具有连续相位（SP）特性的CP方形环路，四个带状线作为驱动元件，四个带I型槽的L形贴片和四个作为寄生元件的I形贴片组成。该平方环用于通过电容耦合方式为两对寄生贴片阵列供电。拟议的天线具有18.9％（6.35 GHz，5.75-6.95 GHz）的3-dB轴向比率宽带宽（ARBW）和23％（6.38 GHz，5.65-7.12 GHz）的10dB阻抗带宽（IBW）宽）。此外，提出的天线在CP操作带宽内具有平坦的增益，并且结构紧凑。