wrote in message ...
| From......: "Bill Miller"
| Newsgroups: sci.physics.electromag
| Sent......: Wednesday, August 18, 2010 10:44 PM
| Subject...: vemsa3d 1.1 - a floss visual em simulator for 3d
antennas
|
| wrote in message ...
| -
| ...
|
| How does this work differ from NEC Numeric Electromagnetic Code for
antenna
| analysis?
|
| Bill Miller
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Dear Mr. Miller,

VEMSA3D can not work differently, because it is based
on the same theoretical method as NEC does, that is on
the Method of Moments.

However, since each of these numerical applications use
a different basis of the current function space and since
their corresponding computer programs use unavoidably
finite linear combinations of them, in general, they
produce different results.

Can you quantify further or explain the nature of thes "different results?"

Are there certain classes of antennas for which VEMSA3D might produce more
accurate results than NEC?

Thanks!

Bill Miller



To be specific, the two bases details are included in the
following:

VEMSA3D current basis:
J. H. Rischmond, Radiation and Scattering by Thin-Wire
Structues in the Complex Freqeuncy Domain, (15), p.6
http://tinyurl.com/24zwycy

NEC current basis:
G. J. Burke, A. G. Poggio
Numerical Electromagnetics Code - Method of Moments
Equation (20), p. 11
http://www.si-list.net/NEC_Archives/nec2prt1.pdf

Regards,

Petros Zimourtopoulos