RE: NEC-LIST: Low Frequency Impedance Problems

You might consider switching to NEC4. There is a change in basis
function which works better for electrcially very short segments.

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From: Geof Noakes[SMTP:noakes_at_wurno.ece.wisc.edu]
Sent: Thursday, April 02, 1998 10:12 AM
To: nec-list_at_ee.ubc.ca
Subject: NEC-LIST: Low Frequency Impedance Problems

I am currently using a version of NEC2 on an HP workstation, I am
modeling some fractal antennas. The wire lengths that I am using are
rather small but within the specs of the NEC ( as printed in the
documentation ). There are many 90 degree bends. I am getting rough
and erratic results for the impedance at low frequencies. What is the
cause of this and how might I fix it? Do I need to try and get a
version of NEC4? Does any one know what advantages there are to NEC4
vs NEC2?

Geof Noakes
University of Wisconsin - Madison
Received on Tue Apr 14 1998 - 12:04:14 EDT