A circularly polarized stub-matched inverted L-shaped antenna for C-band applications is presented in this communication. Antenna parameters of inverted L-shape on the radiating patch and slits, notch, square strips and stub on the ground plane and the effect of these are analyzed. The proposed optimized antenna (A5: 0.54λ0 × 0.54λ0 × 0.02λ0 mm3) is selected among antennas (A1 – A5) with 5.1 GHz design frequency after simulation through high-frequency structure simulator (HFSS). Circular polarization is obtained by introducing stub/perturbation on the ground plane. By introducing stub, the highest measured (S11 < − 10 dB) impedance bandwidth of 50.9% (3.48 – 5.86 GHz) is observed amongst the reported and compared bandwidths. Peak gain of 5.32 dBi and 3 dB axial ratio bandwidth of 16.2% (4.71 – 5.54 GHz) is reported in the present work. An antenna is useful in the entire downlink frequency (3.7 – 4.2 GHz) of the C band.

中文翻译：

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用于 C 波段应用的微带线馈电倒 L 形圆极化天线

本文介绍了一种用于 C 波段应用的圆极化短截线匹配倒 L 形天线。分析了辐射贴片上的倒L形天线参数和地平面上的狭缝、缺口、方条和短截线天线参数及其影响。建议的优化天线（A5: 0.54λ0× 0.54λ0× 0.02λ0毫米3）在天线（A1- 一种5) 通过高频结构模拟器 (HFSS) 模拟后的设计频率为 5.1 GHz。通过在接地平面上引入短截线/扰动来获得圆极化。通过引入存根，最高测量（小号11< − 10 dB) 阻抗带宽为 50.9% (3.48 – 5.86 GHz) 在报告和比较的带宽中被观察到。目前的工作报告了 5.32 dBi 的峰值增益和 16.2% (4.71 – 5.54 GHz) 的 3 dB 轴比带宽。天线在 C 频段的整个下行链路频率（3.7 – 4.2 GHz）中都很有用。