What is the best way to implement a frequency dependent voltage source in feko?

tobias_from_edag

Hi, I am trying to simulate a frequency dependent voltage source in feko. Specifically I am simulating an antenna that has been calibrated according to iso-11451-2.

Which means I have a csv file of frequency points with associated voltage values that should describe the correct excitation for each point. This file was generated from measurements or previous simulations of a different feko model.

I want to simulate my antenna and target in such a way that I have correctly scaled nearfield and current and surface current values.

For a previous similar problem I used "create frequency ranges" and changed the power scaling for each resulting model by hand, but for my current situation there are too many frequency points.

I am looking for advice on how to provide that rescaling. I can not tell weather the scaling option in postfeko even allows such scaling. Or otherwise what is the best method to implement such a scaling in cadfeko? Is there an option I am missing?

Torben Voigt

Hi Tobias,

This can be done by creating a new StandardConfiguration for each frequency (= each voltage). Or copying an existing standard configuration and changing the voltage. If there are a lot of values, it makes sense to do this with scripting. In CADFEKO there is "Macro recording". You could activate this and then copy a StandardConfiguration and change the voltage. However, make sure that "Voltage per Configuration" and not "global" is set.

You could change the script created in this way with a for loop so that all StandardConfigurations are created. It should also be possible to read in the values from .csv or .txt.

I hope I was able to help you.

Best regards,
Torben

tobias_from_edag

Thanks Torben.

I had forgotten this option. Though I have problems with re-combining the results of the separate configurations into single datasets in postfeko.

I couldn't find a premade script to do that, which is why I switched to separate models from "create frequency ranges" for my last project and used the "combine results" macro. And of course a semi-manual approach is made harder by the fact that there is no macro-recording in postfeko.

Torben Voigt

I don't have time right now, but there should be an option in POSTFEKO in case of multiple configurations ("Combined…"). Will have a look later.

tobias_from_edag

I just go around to test the combination of configurations and I can't get it to work. When I accidentally simulated 2 configurations with the same frequency, I got a combined section to appear in postfeko.

But when I simulated with several configurations with different frequencies, there was no combined section and I can not find an option to create it.