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
