In this paper, a compact triple-band printed monopole antenna with circular polarization (CP) has been presented for C-band wireless applications. To achieve the triple-band CP response, the top layer of antenna geometry consists of a meander structure and two orthogonal stubs, whereas a ground plane consists of a vertical slot. The 10-dB impedance bandwidth of the proposed antenna is 450, 560, and 830 MHz at center frequencies of 4.1, 5.8, and 6.7 GHz, respectively. The 3-dB axial ratio (AR) bandwidth’s attained around center frequencies is 4.29%, 4.03%, and 3.52%, respectively. Additionally, the proposed design exhibits a miniaturized performance with an overall size of 0.35 × 0.39 × 0.017 λ, where λ represents free space wavelength at smallest CP frequency. Furthermore, the structure has a simple topology, broadside radiation, and sufficient moderate gain. The proposed antenna has been fabricated and its measured responses are in good agreement with the simulated results.

在本文中，已经介绍了一种用于 C 波段无线应用的具有圆极化 (CP) 的紧凑型三波段印刷单极天线。为了实现三频 CP 响应，天线几何结构的顶层由曲折结构和两个正交短截线组成，而接地平面由垂直缝隙组成。建议天线的 10-dB 阻抗带宽分别为 450、560 和 830 MHz，中心频率为 4.1、5.8 和 6.7 GHz。围绕中心频率获得的 3-dB 轴比 (AR) 带宽分别为 4.29%、4.03% 和 3.52%。此外，所提出的设计表现出整体尺寸为 0.35 × 0.39 × 0.017 λ的小型化性能 ，其中λ代表在最小 CP 频率下的自由空间波长。此外，该结构具有简单的拓扑结构、宽边辐射和足够的中等增益。所提出的天线已经制作完成，其测量响应与模拟结果非常吻合。