I have also the warning "Highest frequency in data is 1e+10 Hz, which is smaller than the maximum source bandwidth 4.8e+10 Hz." meanwhile my voltage source is only at 8 GHz.
It is the ideal sin waveform. When I replace the imported 3-ports S-parameter by the ideal balun, it has the same message but the two outputs are equal in amplitude.Can you plot the spectrum of your transient waveform, for this 2ns analysis period? Have you tried with EM simulation down to DC?
It is the ideal sin waveform.
I disagree. In the transient plot that you show, there is a 0.5nS period where voltage is zero, and then we have sinewave for only 1.5ns.
But hey, it's your model, so feel free to ignore my advice. Good luck anyway!
Volker ,
Keysight Certified Expert EDA
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I have done the same simulation in AWR and the waveforms are same as expected.I think there are some tricks in convolution technique of ADS.
View attachment 137882
However, it does not explain the different outputs.
With the three ports, if |S21| = |S31|, I do not see why the output at port 2 |out2| is different to the output at port 3 |out3|.
Only for the center frequency in this spectrum, you have |S21| = |S31|.
If you upload the ADS workspace in proper archive format (*.zip format not *.tar.gz), or at least your *.s3P file, I can have a closer look.
I suggest you to re-simulate your Rat-Race Balun with finer simulation steps-for instance using with adaptive steps in Momentum over a bit larger frequency band.It works with Marchand Balun but not with Rat Race Balun, even they have the same S parameters at 8 GHz. That why I dont understand.
The rat_race.s3p is also in my project with the marchand_balun.s3p
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