NEC-LIST:MSAs in NEC

I know I'm over looking the obvious here, but if someone could point out
the obvious to me it would be much appreciated!I have simulated a 435MHz
microstrip antenna in 'Ouray Microstrip Antenna Designer' software. This
software is based on the Cavity Model. When I try and simulate the
dimensions suggested in Ouray in NEC software it simply doesn't work, I
get very strange results such as positive return loss! The software I'm
using is Win NEC Pro and Super NEC, both NEC2 based programs. I'm also
trying to simulate a plate antenna in both and getting very similar
results. The solid plates in both the microstrip and the plate antennas
are simulated in both pieces of software as wire meshes, with the wire
spacing of the mesh less than 1/10th of a wavelength. To the software
this appears to be solid. The problem is that in both antennas the
distance between my ground plane and the plate is much less than 1/10th
of a wavelength, approximately 10mm. Could the problem be that the NEC
software assumes that the ground plane and top plate are one solid
structure with no gap between them? Can microstrip antennas even be
simulated in NEC?Any suggestions would be much appreciated. Graham KinchDublin
Institute of Technology.

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