CST仿真天线双站RCS馈电点处加不加波导端口？

小编最近在学习天线双站RCS仿真，发现一个现象，例如一个最简单的贴片天线，背后同轴线馈电，正上方用平面波照射，如果背后的同轴线不设置波导端口，得出双站RCS的结果，然后不知怎么滴脑袋一抽，给同轴线端口设置了波导端口，仿真出来的结果和不加的完全不一样，而且在一维结果里有个F-Parameter的参数（我选择的激励源都是平面波）。这两个的不同之处在什么地方?F-parameter指的是什么参数?看的很多文章里都是没有提到这个参数的，所以小编很是疑惑，双站RCS的仿真方法究竟是哪一种呢?或者说都代表了什么意思呢?

希望知道这方面的大神指导一下啊

你需要百度一下，看看天线的结构项RCS和模式项RCS的区别和定义

请学会使用软件的帮助文件。
CST MWS帮助文件《Reference and Normalizing》：
S-Parameter and F-Parameter calculation
In general, S-Parameter results are given as the ratio of incident and reflected voltage wave spectra at a port, where only one port is excited and all others are perfectly matched. Consequently, for transient simulations, all port signals first have to be transformed into the frequency domain, providing broadband results for one port excitation with only one simulation run.
However, in the case of simultaneous excitation several ports are stimulated at once, so it is not possible to apply the general S-Parameter definition. Now the incident and reflected spectra are given as so-called incident and reflected F-Parameters, all normalized to the spectrum of the reference signal. Furthermore, as an additional result and for a better analysis of the structure's behavior, the reflected spectra of all excited ports are normalized to their own incident spectra, respectively, providing so-called active S-Parameters. Since there might be more energy absorbed at a specific port than it itself has injected, the resulting curves could show active behaviour with values greater than one.
Please note that also in the case of a plane wave or field source excitation, the outgoing signals at ports are used to determine F-Parameters as described above.

谢谢，目前还不太会使用帮助文件，只能慢慢学习了

点鼠标的事情能有多难?

Since there might be more energy absorbed at a specific port than it itself has injected, the resulting curves could show active behaviour with values greater than one.
这句话很有道理啊

馈电口不设成 波导口，那就是开路状态，和匹配状态肯定差很多