RE: NEC-LIST: Modelling the RF absorber in a GTEM

Daryl,

To the best of my knowledge, it is not possible with any pure MoM solver.
FDTD solvers can work with modification and a PEEC solver is probably the
best. The biggest bit of the problem is that the absorber is a frequency
dependent circuit element in the model.

Best of luck,

Brent DeWitt

-----Original Message-----
From: nec-list-admin_at_gweep.ca [mailto:nec-list-admin_at_gweep.ca]On Behalf
Of Daryl Van Vorst
Sent: Thursday, March 28, 2002 7:47 PM
To: nec-list_at_gweep.ca
Subject: NEC-LIST: Modelling the RF absorber in a GTEM

Is there a way to approximate an RF absorber in an NEC2 simulation?

I'd like to model a GTEM. That may be asking a bit too much from NEC2, but
it doesn't hurt to try. :) Has anyone else tried this?

For anyone who has no idea what a GTEM is, it's just a very large tapered
50-ohm transmission line with a load and absorber at one end and feed point
at the other. From the outside it looks like a large aluminum pyramid.
Smaller GTEM's are a few feet long, and larger ones are (apparently) large
enough to drive a car into. Supposedly they are very broadband compared to
similar things like TEM cells (ie: Crawford cells).

The absorber at the load end (large end) of the GTEM is the same stuff that
you find in shield rooms used for antenna testing - the blue (at least all
the ones I've seen are blue) pyramids.

-Daryl.

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