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Recent content by kotsoss

  1. K

    Help with FDTD (2,4) program

    Anyone have a 4th order fdtd code?
  2. K

    Help with FDTD (2,4) program

    Hi, I think that my fdtd program doesnt work properly. It is 4th order in space and 2nd order in time. In 2th order in space my programworks correct. L=100; i=zeros(1,L); v=zeros(1,L; dz=0.01; c=0.1; l=250; dt=dz*sqrt(l*c); for n=1:2000 t=n*dt; for k=1:L-1 if...
  3. K

    How the refractive index appears in λ=u/f*n ?

    Hi, I know that the wavelength is given by λ=u/f, but I saw λ=u/f*n, can someone explain how the n appers? The speed of light is co=λοf, the speed in a medium is c=λf, there is no n in the relation.
  4. K

    Calculation of reflection coefficient using FFT in FDTD code (matlab)

    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...
  5. K

    Fdtd simulation problem

    Fdtd matlab simulation problem Hi. Im trying to simulate a 4th order accurate in space equations but its not working. For 2nd order its working. Here is my code len=100; i=zeros(1,len+2); v=zeros(1,len+2); dz=0.01; c=0.1; l=250; dt=dz*5; for n=1:2000 t=n*dt; for k=3:len+1...

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