CST MWS中discrete端口和waveguide端口同時存在時S21不一致

如題，假設有兩個端口，一個是discrete,一個是waveguide ，為什么算出來的s21曲線并不一致?

However, due to the transmission between transmission lines of different geometric dimensions, reflections may occur that are much larger than those for the termination with waveguide ports. For lower frequencies (compared to the dimension of the discrete port), these reflections may be sufficiently small, such that these kinds of ports may also be used successfully for the S-parameter calculations of multipin connectors
——《Discrete Port Overview》
這兩種端口是不同的，因而不一致很正常。

這個真不知道為什么

Lz解決問題了嗎?解決之后來講解一下啊 。

理解的不太明白，hfss 里面波端口和集中端口的s參數應該是互易的，為什么cst 不是呢?

這個不能以一個軟件里“互易”作為判斷依據，而要以物理/數值分析上這兩者是否可以“互易”來判斷。
CST的Help說的比較明白了，關鍵詞是Reflection。