ABSTRACT In this article, a new compact Circularly Polarized Antenna with wide operating bandwidth is proposed. The proposed structure consists of a Modified Circular Split Ring Resonator (MCSRR) as the radiating patch, which is fed by coplanar waveguide and loaded with 2 × 2 closed-ring resonantor (CRR) array on its FR4 epoxy substrate. The dimensions of the antenna are 0.329 λo x 0.329 λo x 0.024 λo (λo stands for the free space wavelength at center frequency of 4.94 GHz).The implementation CRR on modified printed monopole antenna leads to a wide measured impedance bandwidth of 2726 MHz with a peak gain of 5.09dBi and efficiency of 96.3% in the operating bandwidth. A prominent feature of the proposed antenna is that dual 3-dB axial ratio bandwidth of 430 MHz and 670 MHz is observed in the operating band, and thus, making it to be a promising candidate for recent day wireless applications. The simulated results was verified by measuring the characteristics of the fabricated antenna; the obtained results showed a good matching with the simulated results.

中文翻译：

---

一种用于无线应用的紧凑型圆极化改进印刷单极天线

摘要 在本文中，提出了一种具有宽工作带宽的新型紧凑型圆极化天线。所提出的结构由作为辐射贴片的改进型圆形分裂环谐振器 (MCSRR) 组成，由共面波导馈电，并在其 FR4 环氧树脂基板上加载 2 × 2 闭环谐振器 (CRR) 阵列。天线的尺寸为 0.329 λo x 0.329 λo x 0.024 λo（λo 代表中心频率为 4.94 GHz 的自由空间波长）。在改进的印刷单极天线上实施 CRR 导致测量阻抗带宽为 2726 MHz，具有峰值增益为 5.09dBi，工作带宽效率为 96.3%。所提出的天线的一个突出特点是在工作频带中观察到 430 MHz 和 670 MHz 的双 3-dB 轴比带宽，因此，使其成为最近无线应用的有希望的候选者。通过测量所制作天线的特性，验证了仿真结果；所得结果与模拟结果吻合良好。