3 D MoM code using MATLAB

Question

3 D MoM code using MATLAB

taksim (Electrical)

(OP)

1 Mar 05 12:21

Hi,

I'm working on the scattering of EM field by 3D dielectric body using METHOD OF MOMENT. Does any one have a code on matlab??

THANKS,

oswaldt (Aerospace) · Answer 1 · 2005-03-24 03:16:50

hi,

not yet, but I am working on an implimentation in matlab. it will take some time.

regards, thomas

VEBill (Military) · Answer 2 · 2005-03-24 07:49:07

How does Matlab's relative execution time compare to, for example, the same algorithm written in the C programming language, or FORTRAN?

Execution time can be an issue for 'large' MoM problems.

taksim (Electrical) · Answer 3 · 2005-03-24 10:21:49

Hi,

i am working on scattering by 3 D dielectric bodies using
Matlab. I am trying to solve Equation 23 [1] using Surface Integral Equation but in vain. I would appreciate your precious advise on solving this kind of double surface integration.

thanking you in advance.

TAKSIM

[1] Umashankar, Taflove, Rao, - Electromagnetic Scattering by
Arbitrary Shaped Three-Dimensional homogeneous LossyDielectric
Objects, 1986, IEEE A&P

taksim (Electrical) · Answer 4 · 2005-03-24 10:28:03

MATLAB may not handle large impedance matrix. DLL files written in C should be created to hanlde them. Execution time wont be an issue as long as the matrix size is small in matlab. ie using less patches.

oswaldt (Aerospace) · Answer 5 · 2005-03-25 03:03:29

I don't know the performance of matlab, compared with fortran or c (of cause it is slower), but I did some performance tests between c and fotran. The result was interesting: When complex data types are involved (as for MOM), fortran(95) is much faster than c. when only real numers are involved, execution times are about equal.

regards thomas

jsolar (Electrical) · Answer 6 · 2005-06-15 14:31:27

When you get an answer, let us know. I think the MATLAB idea is great for small problems or concept modeling.
As mentioned before, memory is an issue. MATLAB has a practical limit of about 1.25 GByte on a PC. Augmenting with mex files based on the TNT C++ matrix library can help with speed, but not memory.

escotbd (Electrical) · Answer 7 · 2005-06-21 04:40:28

Hi all,
I also work with MoM and always since I began, I've used FORTRAN. Matlab is ok for small problems. At least that's what I've always heard because I've never tried myself to do a test between both languages. Anyway, FORTRAN is ok.
Taksim, could you send me the paper you metioned? I'll see if I can be of any help

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3 D MoM code using MATLAB