[Antennas] Calculating NEC or EZNEC models with a MININEC engine

2002年10月28日 20:16:19 -0800

The latest version of the freeware MultiNEC program has an interface to 
the "Antenna Model" package by Teri Software (www.antennamodel.com). 
Antenna Model (A.M.) uses an enhanced and corrected MININEC type engine. 
 As L.B. Cebik pointed out in a recent article, there are certain types 
of models that cannot be processed accurately by NEC-2 or, to a lesser 
extent, NEC-4. (See "When MININEC is Superior to NEC" at 
www.cebik.com/amod/amod56.html.) And even for models that don't fit 
this criteria, A.M. offers some pretty impressive graphics capabilities. 
 See, for example, www.qsl.net/ac6la/adhoc/am3d.gif (18 KB).
Being MININEC-based A.M. of course does not support Sommerfeld type 
ground or "NEC type" (ideal) transmission lines. Except for those 
restrictions, models in any format that is recognized by MultiNEC 
(EZNEC, NEC, MMANA, ELNEC, AO, Nec/Wires, A.M., or the Excel-based 
MultiNEC format itself) may be calculated using any engine that is 
supported by MultiNEC (EZNEC Standard; EZNEC-M Pro; EZNEC/4 Pro; Nittany 
NEC-2 [NWPlus and NWPro]; Nittany NEC-4 [GNEC]; public domain NEC-2; or 
corrected MININEC [A.M.]). You could for example use A.M. to get a 
"feel" for the 3D radiation pattern but then use EZNEC or NEC to obtain 
precise impedance and gain figures with the use of Sommerfeld ground, 
all while building the geometry of the model just once. Or you could 
use MultiNEC in its more traditional "make multiple runs while 
automatically changing variables" mode with A.M.
The latest MultiNEC release has several other enhancements, including 
the ability to read and write 2D radiation plots in OpenPF format. 
These "plot files" can be exchanged with other programs that use the 
OpenPF format, including EZNEC and A.M.
For more details on MultiNEC and a free download file see 
www.qsl.net/ac6la/. MultiNEC requires Excel 97 or later.
73,
Dan AC6LA