CST MWS仿真结果分析

有如下关于CST仿真结果的疑问，
1D Results -> Port signals -> i1
1D Results -> Port signals -> o1,1
的单位是什么，代表了什么物理含义。
请各位前辈指教，谢谢 ：）

Waveguide port, discrete port, or nearfield source input signals start with i, output signals start with o, and the numbers describe the port where the signal is recorded and which port was stimulated.
If multiple modes are excited per port, the signal labels are extended by the mode number in round brackets. The mode numbers are located directly behind the port number.
要多看帮助文件啊，都说的很清楚的。

我看了帮助文文档，(i1), (o1,1)的输入输出端口标识符有说明，但是图形中纵坐标的单位没有标注。
还请前辈指教。
谢谢！

小编看看这个帖子：
http://bbs.rfeda.cn/read-htm-tid-83539.html

谢谢前辈 ：）