Would anyone like to talk about CGM-FFT?

when one deal with electrically large body with MOM(method of moments), the CGM-FFT is very useful technique,but I don't know how to use it, would anyone like to give me some advice? thanks

Ok
The induced fields due to currents sources can be written as the convolution beteween the Green's function and the currents. If you take the fourier transform of this convolution (spectral domain) you can wrtite it as a product of two functions so say goodbye to the frelholm integral equation. Unfiform sample your geometry and the GF, solve the problem using an iterative solver (CGM) and FFTs to compute the "convolution" and that's all It sounds easy, doesn't it?
There is a book about this method, search for M.F Catedra and CGM-FFT I think it was published by Artech.
Good luck

Dear friends,
a lot of work has been done for the CG-FFT.You have to search the IEEE,many papers have been written for this purpose.It is exactly as Chinasky said.


Sincerely
gaudi :o

thanks so many, I have found the book "application of signal processing techniques to electromagnetics " in library, ISBN:0890066345 .