A novel method of using axial ratio (AR) contour to design a broadband circularly polarized (CP) antenna is presented in this letter. By resolving a radiated CP wave into two orthogonal far-field components, the resulted AR will be determined by the radiated power and phase differences between the two orthogonal components. Therefore, a series of AR contours can be obtained for different AR values of the radiated wave. In the AR contour, details of phase advance, phase lag, power advance, and power lag can be simultaneously observed along with the resulted AR. Based on these analyses, the AR contour is first utilized to directly design a broadband CP antenna instead of using the traditional AR versus frequency curve to achieve optimal AR bandwidth. Compared to the traditional AR curve, the method of using AR contour to design CP antenna is more effective and informative. The designed broadband CP antenna was also fabricated and measured for the final performance verification.

中文翻译：

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利用轴比轮廓设计宽带圆极化天线

在这封信中介绍了一种使用轴比 (AR) 轮廓设计宽带圆极化 (CP) 天线的新方法。通过将辐射的 CP 波分解为两个正交的远场分量，最终的 AR 将由两个正交分量之间的辐射功率和相位差决定。因此，对于辐射波的不同AR值，可以获得一系列AR轮廓。在 AR 轮廓中，可以同时观察到相位超前、相位滞后、功率超前和功率滞后的细节以及产生的 AR。基于这些分析，首先利用 AR 轮廓直接设计宽带 CP 天线，而不是使用传统的 AR 与频率曲线来实现最佳 AR 带宽。与传统的AR曲线相比，使用 AR 轮廓设计 CP 天线的方法更有效且信息量更大。还制作并测量了设计的宽带 CP 天线，以进行最终性能验证。