NEC-LIST: Problems in analyzing NEC-2 output files

Hi,

I am a student. I am doing a project on EMI shielding using a
conducting box. I have tried to model a simple dipole to act as the
source for emitting electromagnectic Interference. I am supposed to
model a shielding box and study the penetation effect. That is, there
should be as little field in the box as possible.

I have constructed 2 input files; one is the source(dipole) and the
other with a small box added. But, when I run the files, the output
radiation field pattern seems to be the same. However, the is a
different in polarization when a box is added. I think this is due to
field scattering by the box.

The input files are as follow:

                FYPT2.NEC -----> file with dipole and box
                FYPT2A.NEC ----> file with only dipole

Some questions:

Is there a limit to the no. of patches used in Multiple Surface
Command(SM)? I cannot construct a larger box. It stop excecuting the
commands when I increase the number of patches.

There is no plotting capabilities in NEC-2. Any software to view the E
field's radition pattern?

How to place the observation pt. inside the box? So that I can know the
peneration effect.

Regards
Chee Siong, Lim

filename="fypt2.nec"

CM -------- Final Year Project --------
CE
SM5,4,0.05,0.,0.025,0.05,0.05,0.025
SC0,0,0.05,0.05,-0.025,0.,0.,0.
SM4,10,0.05,0.05,0.025,0.05,0.05,-0.025
SC0,0,-0.05,0.05,-0.025,0.,0.,0.
SM5,10,0.05,0.,0.025,0.05,0.05,0.025
SC0,0,-0.05,0.05,0.025,0.,0.,0.
SM10,4,0.05,0.,0.025,-0.05,0.,0.025
SC0,0,-0.05,0.,-0.025,0.,0.,0.
SM5,10,0.05,0.,-0.025,0.05,0.05,-0.025
SC0,0,-0.05,0.05,-0.025,0.,0.,0.
SM4,5,-0.05,0.,0.025,-0.05,0.,-0.025
SC0,0,-0.05,0.05,-0.025,0.,0.,0.
GX0,000
GW1,5,0.,0.1,0.125,0.,0.1,-0.125,0.001
GS0,0,1.
GE0,0,
EX0,1,3,0,3.,0.,0.,0.,0.,0.
RP0,37,1,1001,0.,0.,10.,10.,0.,0.
RP0,1,37,1001,90.,0.,10.,10.,0.,0.
EN

filename="fypt2a.nec"

CM -------- Final Year Project --------
CE
GW1,5,0.,0.1,0.125,0.,0.1,-0.125,0.001
GE0,0,
EX0,1,3,0,3.,0.,0.,0.,0.,0.
RP0,37,1,1001,0.,0.,10.,10.,0.,0.
RP0,1,37,1001,90.,0.,10.,10.,0.,0.
EN
Received on Thu Sep 24 1998 - 09:58:25 EDT