HFSS中如何顯示輸入阻抗的smith圓圖，以判斷天線圓極化特性

查看天線圓極化的常用方法是看遠場最大輻射方向的軸比AR，一般認為AR<=3dB就認為是圓極化，但是利用HFSS仿真Frequency-AR曲線輸出特別慢。
在《Broadband microstrip antennas》一書中看到可以利用查看天線的輸入阻抗圓圖來判斷其是否產生圓極化波，原文為：Another way to recognize whether the given dimensions are optimum for the best AR is to look at the impedance plot of the antenna. If there is a kink (extremely small loop) in the impedance plot corresponding to the excitation of the two orthogonal modes, it will yield the best AR at the kink frequency. Instead of a kink, a small loop or the absence of the loop in the impedance plot yields poor AR.

是畫s參數，不是z

以前沒有看smith 圖學習啦

學習啦！很有收獲！

學習中啦！很有收獲呢！