Re: NEC-LIST: Large Model Problems....

The simple answer is errors in the model's geometry are causing a resultant
negative resistance. Error is probably in the feeding structure. Suggest the
student remodel the feed without the parabolic dish.

Malcolm Packer
Electromagnetic Scientist
Harris RF Communications
1680 University Avenue
Rochester, New York, 14610
585-242-3078

-----Original Message-----
From: Rob Frohne [mailto:frohro_at_wwc.edu]
Sent: Wednesday, February 18, 2004 11:55 PM
To: nec-list_at_gweep.ca
Subject: NEC-LIST: Large Model Problems....

Hi All,

I have a student who is trying to model a 10 foot parabolic dish at 2.4
GHz. He has around 11,000 segments, though using symmetry, he has
reduced the matrix dimensions by a factor of four. He is getting gains
that are -999.99 for every direction. The electric fields are not all
the same, and may make sense. I didn't get a chance to see that.

Does anyone have any advice for my student?

Thanks,

Rob

--
Rob Frohne, Ph.D., P.E.
E.F. Cross School of Engineering
Walla Walla College
http://www.wwc.edu/~frohro/
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