In this paper, a wideband circularly polarized corrugated G-shaped grounded ring slot antenna is presented. The proposed antenna structure is excited using a coplanar waveguide-fed monopole antenna, which is placed inside a corrugated G-shaped grounded ring. Due to the asymmetry in the ground plane, two orthogonal modes, having equal magnitude and out of phase by 90° are excited, resulting in circular polarization (CP). The generation of the CP in the proposed antenna structure is explained using thin dipole current element approximation. A prototype of the proposed antenna is fabricated and tested. The measured results exhibit a 3 dB axial ratio bandwidth of 37.6% (2.22–3.25 GHz), and reflection coefficient bandwidth (|S11| ≤ −10 dB) of 47.91% (2.13–3.47 GHz). Additionally, the design guidelines are also presented for G-shaped grounded ring slot antennas.

中文翻译：

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一种用于宽带圆极化的波纹G形接地环形缝隙天线

本文提出了一种宽带圆极化波纹G形接地环缝天线。所提出的天线结构使用共面波导馈电单极天线激励，该天线放置在波纹 G 形接地环内。由于接地平面中的不对称性，两个正交模式，具有相等的幅度和 90° 的异相被激发，导致圆极化 (CP)。使用薄偶极子电流元件近似来解释所提出的天线结构中 CP 的产生。制作并测试了所提出天线的原型。测量结果显示 3 dB 轴比带宽为 37.6% (2.22–3.25 GHz)，反射系数带宽 (|小号11| ≤ -10 dB) 的 47.91% (2.13–3.47 GHz)。此外，还提出了 G 形接地环形缝隙天线的设计指南。