The most important characterizing parameters which determine the antenna performance are axial ratio bandwidth, impedance bandwidth and gain of wireless systems. The improvement of these parameters are presented in the proposed antenna. Basically, the proposed design consists of an inverted L-shaped microstrip feed line and modified ground plane. The size of the antenna is 0.4 × 0.28 × 0.0128 λ 0 (where λ 0 be the free space wavelength at f r of 2.4 GHz). The designed antenna has been fabricated and the measured results of fabricated antenna are compared with the simulated results. It is found that the results are very good in agreement. Novelty of the research work is the improvement of axial ratio (less than 3 dB) bandwidth. As a result, the antenna is circularly polarized for a good amount of bandwidth which is desired in the modern communication system. Circularly polarized antenna is able to transmit and receive both vertically and horizontally polarized electromagnetic waves.

中文翻译：

---

用于无线系统应用的圆极化印刷单极子的性能增强

决定天线性能的最重要的表征参数是无线系统的轴比带宽、阻抗带宽和增益。这些参数的改进在所提出的天线中提出。基本上，建议的设计包括一个倒置的大号形微带馈线和改进的地平面。天线尺寸为0.4×0.28×0.0128λ 0（在哪里λ 0是自由空间波长F r 2.4 GHz）。设计的天线已经制作完成，并将制作好的天线的测量结果与仿真结果进行了比较。发现结果非常吻合。研究工作的新颖之处在于轴比（小于3 dB）带宽的改进。结果，天线被圆极化以获得现代通信系统中所需的大量带宽。圆极化天线能够发射和接收垂直和水平极化的电磁波。