UWBAntennas Simulation with HFSS  RF Cafe Forums

pashmineh

Post subject: UWBAntennas Simulation with HFSS
Posted: Sun Mar 25, 2007 11:07 pm


Joined: Sun Mar 25, 2007
10:55 pm Posts: 1 Location: Hannover/Germany

Hello, I research about uwbantennas. The
only simulation tools that I have, are
"HFSS and Matlab".
With HFSS I can simulate only
in frequency domain but I need to study the output
signal and other parameters in
time domain.
My problem is my results are in frecuency
domain. How can I get it in time domain?
I will be glad for any tipps. Thanks.





nubbage 
Post subject:
Posted: Mon Mar 26, 2007 5:29 am



General 

Joined: Fri Feb 17, 2006
12:07 pm Posts: 218 Location: London UK

Sounds like a case for Fast Fourier Transformer.
You could sample the amplitude and phase S21 with
say 255 points (the frequency domain "spectrum"),
then multiply these by the equallyspaced spectral
lines in the frequency spectrum of the input pulse.
You then do an FFT number on them with something
like MATHCAD. That gives you the time domain or
pulse output. I wrote a MATHCAD routine to do
this for a pulse stream entering a twisted pair
lossy cable, knowing the frequency dispersion of
the cable loss characteristic. First I derived the
frequency spectrum of the input pulse stream using
the Fourier Transformer in MATHCAD. Multiplying
each spectrum line of the input pulse spectrum by
the corresponding loss value for that line gave
the output spectrum Inverting the frequency domain
using the Inverse FFT in MATHCAD I got the output
time domain pulse shape showing characteristic pulse
distortion (slow rise and fall time edges, sloping
flat top, and ringing).





Kim35 
Post subject:
Posted: Mon Mar 26, 2007 10:17 pm


Joined: Mon Mar 26, 2007
10:14 pm Posts: 1 
Hi Pashmineh,
i work with CSt. It is very
good for simulation.
Kim


Posted 11/12/2012







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