RE: NEC-LIST: Antenna pattern distortion modelling

I have run the NEC-BSC3 (containing UTD formulations). The code is
superbly written by Ron Marhefka and his students (and the earlier
versions by Ron Marhefka & Walter Burnside). All from ESL, OSU.

The code seems, in my view, the only solution to modeling of "antenna
pattern distorions by neighboring structures" for structures about a
wavelength or greater. The greater the better the accuracy. The
advantage ? Well, the computer resources required as frequency goes
higher remains constant for NEC-BSC, while it does increase almost
exponentially for NEC-MOM codes.

This is not a problem with NEC-BSC or NEC-MOM, but a fundamental
numerical limitation with "exact" (MOM) and "asymptotic" (BSC)
formulations themselves.

So if you are working around 1 GHz and structures around you have mean
dimensions equal to or greater than 1*lambda, use NEC-BSC. However,
you can use the NEC-MOM code about this frequency (1 GHz) to verify
the results.
      
*************************************************************
             Deb Chatterjee, Ph.D.

       Assistant Professor, ECE Dept.,
  University of Missouri-Columbia/ Kansas City (UMKC)
  370-H Robert H. Flarsheim Science and Technology Hall
  5100 Rockhill Road, KC, MO 64110-2499

   tel.: (816)235-1276 (voice) || fax: (816)235-1260
   e-mail: chatd_at_umkc.edu
Received on Tue Sep 21 1999 - 06:49:56 EDT