CST MWS probe的|P| linear结果的单位问题
时间：10-02
整理：3721RD
点击：
在我的模拟中，用到了probe，要看FFT结果，我想问下，probe的probe 的|P| linear结果的单位是什么?
下面是help中的相关说明。像是做了某种归一化。
“ Probes are used to record one particular component of the electromagnetic field in a specified location during the transient analysis. Probes are available for locations inside and outside the calculation domain.
The primary result is ”Probe time signal” for both probesThis probe time signal is used to automatically derive frequency domain results using the Fourier transform.
The Fourier transform results will be normed such that the input power is normed to 1 W for each frequency point. With this norming, the frequency domain data can be considered as being a transmission function between the stimulation port and the electromagnetic field at the probe’s position and orientation. The frequency domain results are named as follows:
|P| linear: magnitude of the probe transmission function in linear scale
|P| dB: magnitude of the probe transmission function in logarithmic scale
arg(P): phase of the probe transmission function”
这是某次模拟的结果。
下面是help中的相关说明。像是做了某种归一化。
“ Probes are used to record one particular component of the electromagnetic field in a specified location during the transient analysis. Probes are available for locations inside and outside the calculation domain.
The primary result is ”Probe time signal” for both probesThis probe time signal is used to automatically derive frequency domain results using the Fourier transform.
The Fourier transform results will be normed such that the input power is normed to 1 W for each frequency point. With this norming, the frequency domain data can be considered as being a transmission function between the stimulation port and the electromagnetic field at the probe’s position and orientation. The frequency domain results are named as follows:
|P| linear: magnitude of the probe transmission function in linear scale
|P| dB: magnitude of the probe transmission function in logarithmic scale
arg(P): phase of the probe transmission function”
这是某次模拟的结果。
求高手指教！谢谢各位！
图上不是写了，A/m
这个A/m就是单位么?那help中的归一化又是什么意思?还有，时域信号进行FFT变化后，它的纵坐标的单位不变么?
求指教！谢谢啦
A/m是磁场的单位。
归一化的意思就是将每一个频点的功率都归一化为1W，这样做了之后Probe的时域信号进行FFT之后与Probe的频域结果是不一样的。
归一化都是频域的，时域是不进行归一化的，可以这样理解，比如你仿真Probe上1GHz-2GHz频带内的值，就相当于在1GHz时输入1W功率，这样就得到了Probe上1GHz的值，这样就得到了一个点，1.001GHz再输入1W的功率，得到了Probe上1.001GHz的值，遍历1GHz-2GHz的所有频点，得到整个带内的Probe值，当然了，实际过程不是这样的。
时域信号的FFT是频域信号，纵坐标不变的
谢谢，现在问题是这样的，我用magic和cst都进行了模拟，但两个的单位是不统一的，cst是A/m，magic是tesla/GHz，然后单位不一样就没办法比较。听了你的话，我还是没太明白怎么转换使cst的单位也是类似A/m/GHz的单位。
继续求指教。
归一化的意义何在 还有probe的时域信号进行FFT之后与probe的频域结果不一样，如何让它们一致 谢谢