Active S参数和S参数之间有什么不同？

HFSS的帮助文件没有写么?
网上百度搜不到么?

网上找了半天没找到呢，帮助倒是没看，我去看看

还是没结果啊    大神们。求赐教啊

给你抄一段CST MWS的帮助文件：
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.
我不相信HFSS的帮助文件里没有。

我作证， HFSS的帮助文档里真没有，里面只有active Z和Z的定义。不过从active Z和Z的定义可以推测出active S和S的定义，所谓ACTIVE S也就是各个端口都有入射波的情况下，n端口的反射波与n端口的入射波的比，就是active Snn,不过要注意的是，对于N端口的器件，ACTIVE s只有N个，而不是N^2

具体表达方式回帖不好写，你可以在HFSS文档里搜索ACTIVE Z，有ACITVE  Z的具体公式，然后你可以类比出ACTIVE S的公式

我2了，HFSS文档里有的是ACTIVE S的定义，需要自己类比出ACTIVE Z。

谢谢楼上的回答

active s is the reflection coefficient of one port when another port is excited...
for example, a 2 port system ,the total reflect wave at port 1 is S11*V1+S12*V2
the total reflection coefficient is total reflect wave at port 1 over total incident wave at port 1,then reflect coefficient is (S11*V1+S12*V2)/V1,which is the active S(1:1)，

说因为传统S参数，每次只在一个端口进行激励，其他端口进行完全匹配。但是在HFSS多端口激励中，传统S参数不能用。只能用Active S param,这样可以考虑其他端口向这个端口传输的能量（即其他端口的耦合分量）。假设有K个端口激励。欲求ActiveSmm：
传统S参数和Active S param的关系ActiveSmm = a1/am*Sm1+a2/am*Sm2+a3/am*Sm3+...+am/am*Smm+....+ak/am*Smk.
其中ak为第K个端口入射波。am为第m个端口入射波，smm为传统S参数

好奇中，今天刚接触这个参数，因为发现active VSWR与VSWR的区别挺大的！