Amplitude and phase In FDTD or MODE

- November 19, 2023 at 5:46 am
  
  pengzheng97
  Subscriber
  
  Hi, I wonder How to get the amplitude and phase of a point in FDTD or MODE, not transmission, what monitor should be used for the information
- November 21, 2023 at 8:26 am
  
  Niki Papachristou
  Ansys Employee
  
  Hi Pengzheng,
  Thank you for contacting us,
  In FTDT you could introduce a mode expansion monitor (Using and understanding Mode Expansion Monitors) and ports (Ports (FDTD) - Simulation Object) at the positions of your interest for both the amplitude and the phase. From this point you can extract the phase, which is connected with S-parameters, as well as with field component and mode. So taking advantage of S-parameters of FTDT you can use angle script command ( angle - Script command) to get the phase. The same case with S-parameters applies on EME solver by using ports.
  
  A simple example how you can use the S-parameters is quoted below:
  SS=getresult("FDTD::ports::port 2","S");
  S21=SS.S;
  Phase=angle(S21);
  ?phase*180/pi; #in deg
  
  You could also get the phase by using a frequency-domain monitor (Frequency-domain Profile and Power monitor - Simulation object) of an individual E component. However, special care should be taken as getting the phase from a frequency monitor it depends on the position on the monitor.
  
  I hope that was helpful, let me know if I can be of further assistance.
  Kind Regards,
  Niki