hi roderwh.how are you?
thanks for your reply in my topic of "near field to far field transformation (FDTD)"
I have another question.
in calculation of frequency domain equivalent surface currents for calculation of N_theta and L_phi at E_theta,do I must devide them to frequency domain excitation source amplitude?becuase in calculation of antenna pattern magnitude,I obtained -150 dB!my source amplitude is 1 VOLT and is a modulated gaussian pulse.but I obtained N_theta in order of 1e-8!
how solve this problem?
I wrote a 3D-FDTD code in matlab.
I calculate J and M currents in Huygens surface as following (for example):
"tmyxp is Mx current in xp plane in time domain" and "tjxzp is Jx current in zp plane in time domain".I calculeted them from E and H fields on the Huygens surface.
tmyxp(1,1,:,
= 0.5*(Ez(ui,lj:uj-1,lk:uk-1)+Ez(ui,lj+1:uj,lk:uk-1));
tjxzp(1,:,:,1) = -0.25*(Hy(li:ui-1,lj:uj-1,uk)+Hy(li:ui-1,lj+1:uj,uk) ...
+ Hy (li:ui-1,lj:uj-1,uk-1) + Hy (li:ui-1,lj+1:uj,uk-1));
then I convert above parameters to frequency domain with fourier transform,but my answer is very small in magnitude.
do I must divide them frequency domain parameters to amplitude of frequency domain excitation source?