Learning Forum

[Frederic Wu]

Hello,

Given that the DFT monitor can record the magnitude as well as the phase of the E field, I wonder when the monitor actually records the data because magnitude and phase changes overtime. 

Thanks. Please tell me if my question is unclear.

[Guilin Sun]

There are two domain results: time-domain and frequency-domain.

To get time-domain results, you will need to use time monitor. You can get the spectrum from the time domain monitor which uses Fourier transform. It does not normalize with the source spectrum. Usually it gives you the resonance for a very broad band.

 

To get frequency-domain result you will need to use Frequency-domain Profile and Power monitor.

Monitors - Frequency-Domain Field - Setup & Tips

The data is obtained though discrete Fourier transform during the simulation. It is steady-state, CW result without any time-related information. By default it is normalized with the source spectrum. Please refer

Understanding frequency domain CW normalization

So DFT monitor does not any time information.