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How is the Gaussian time dependency applied to the 2D field?

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elektr0

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Hallo,

when using a waveguide port in CST Microwave Studio a 2D Frequncy Domain
Solver first tries to get out which mode can propagate down the line.
MWS is a TimeDomainSolver, using a gaussian input signal by default,
the question is:

HOW IS THE GAUSSIAN TIME DEPENDENCY APPLIED TO THE 2D FIELD
E(x,y), H(x,y) ?

When the Sparameters are calculated, a DFT is necessary, therefore the calculated fields have to be reduced again to a simple time signal (to perform a DFT).

So, it seems to be an important information, how this transition (time signal - 2d field) is performed.

Thanks for any reply
greets elektr0.
 

adel_48

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CST Time Domain

Hi elektr0,

I think they are simply applied this way
The time domain electric field at the port is
E(x,y,t) = E(x,y) * exp(- ((t-T0)/w)^2)

best regards,
Adel
 

elektr0

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Re: CST Time Domain

ok. good idea.
may be i will ask the cst support as well.
thank you so far.

after exciting one port, there will be field distribution (E(x,y,t)) on the other ports.
The simulator has to separate the field of port one E(x,y) to just cover the new
time dependency, which gives the s parameters after DFT.
 

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