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10 Threads found on edaboard.com: **Fdtd Fft**

I want to obtain the reflection coefficient using **fft** in a transmission line, the source was excited with a Gaussian pulse. Τhis is an abstract from a paper that I have as guide:
"In order to obtain the reflection coefficient, the coaxial cable was excited with a Gaussian pulse of the form
Vs (t) = exp(-(t − 3Ts)/Ts)
Ts =1/2fmax
w

Electromagnetic Design and Simulation :: 08-14-2013 18:42 :: kotsoss :: Replies: **0** :: Views: **3016**

How can I convert Sin(wt) to calculate its value in space or with respect to x? To solve the electric field and magnetic field simultaneously for the **fdtd** algorithm.
You need to explain a bit more clearly what it is you do/want/need (sources for **fdtd**?).

Electromagnetic Design and Simulation :: 02-13-2011 05:33 :: iyami :: Replies: **3** :: Views: **1457**

Hello People.
I have a simple question.
I´m using **fdtd** simulations to calculate the power of the signal on a scenario location.
I´m using a soft source that is a sinusoid modulated with a gaussian pulse with a determinate frequency.
I apply the source in the time domain and never do the **fft** after calculate the electric field and obvio

Electromagnetic Design and Simulation :: 07-29-2009 17:27 :: roldao :: Replies: **1** :: Views: **2106**

my method now is: after **fdtd** calculation, we can get E. H data in time domain. To get E.H distribution for arbitrary frequency in post-processing, we have to store all the E.H data in time domain followed by **fft**.
However, if i got a big structure, say 1000,000 cells, it is not so practicable to store all the data in time domain.
anyb

Electromagnetic Design and Simulation :: 07-25-2007 10:13 :: tenderne :: Replies: **2** :: Views: **1176**

hi see this file,
I have a 3D **fdtd** code for a icrostrip that i calculate the Sij, so if you need just ask me.
best wishes

Electromagnetic Design and Simulation :: 07-18-2007 12:02 :: helio1972 :: Replies: **5** :: Views: **1712**

i wrote my **fdtd** for pbg of Phc,but i can't get the correct **fft** from ez field evolution ,
if i set the time step too little ,the frequency which i get by **fft** always be a line (w=0); i can't understand why , are there anybody to help me?

Electromagnetic Design and Simulation :: 10-04-2006 10:26 :: shenhongj2004_05 :: Replies: **3** :: Views: **1866**

Could any one know how to obtain the modal properties of photonic crystal fiber like effective index, dispersion, .... from the **fdtd** method.
I know that we must take first **fft** then what?

Electromagnetic Design and Simulation :: 08-09-2006 12:36 :: engmfarhat :: Replies: **12** :: Views: **2414**

hello
I simulate microstrip ring resonator with **fdtd** and matlab code, above resonator lossy material
( relative permibelity Er and conductivity segma), my problem resonant frequency (s21) don't change with change of Er and segma else in free space is change for example when 1-Er=1 and sgma=0 for free space first resonant (fr1)is 3 GHz
2-Er=3 se

Electromagnetic Design and Simulation :: 06-12-2006 01:23 :: Amira1 :: Replies: **6** :: Views: **4829**

Fairly easy :
with oAB being the **fdtd** reponse at the port A to the extication coming from B.
S11=**fft**(o11,N)./**fft**(i1,N);
S21=**fft**(o21,N)./**fft**(i1,N);
..
S34=**fft**(o34,N)./**fft**(i4,N);
and so on.
choose N with respect to the frequency resolution you want and the time (...)

Electromagnetic Design and Simulation :: 01-24-2006 03:07 :: Supaswing :: Replies: **5** :: Views: **4634**

Hi no_no
you can see the last fig. in this attach. which from x**fdtd**

Electromagnetic Design and Simulation :: 08-05-2005 20:08 :: h_a_p_y :: Replies: **4** :: Views: **2430**

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