rrumpf
Joined: 06 Jul 2007
Posts: 80
Helped: 10
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 23 Aug 2008 20:26 Re: How to implement electric dipole source in FDTD? |
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This may be the simplest of all sources to implement and there are two ways you can do it: hard soure and soft source. The "best" way for you is probably the soft source as this is closer to the physical situation.
1. Pick a point to implement the dipole source (nx,ny,nz)
2. Inside your main FDTD loop, you will have a statement like:
Ez(nx,ny,nz) = s(nt); %% hard source
Ez(nx,ny,nz) = Ex(nx,ny,nz) + s(nt); %% soft source
where (nx,ny,nz) is the position of the source, Ez is the z-component of the electric field, nt is the integer time step, and s(t) is the source as a function of time and probably a short gaussian. You can, of course, use Ex or Ey as the dipole polarization as well.
Hope this helps!
-tip
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