RF module or Wave Optics ??

Hi,

I am trying to simulate the wavelength/ frequency transmission and reflection of a nanoscale cross-dipole antenna on a dielectric substrate.

For this I have taken the approach of the RF module (emw) "Freq Selective Surface with a Split Ring resonator" example as a starting point. Resonance as at 4.6 GHz but I have scaled the frequency up and the geometry down for resonance at around a wavelength 6-10 um. Two ports and S parameters are used to calculate reflection and transmission. Simulations run, but I do not feel very certain about the results

A more suitable approach maybe to use the Wave Optics module (ewfd) ???
Any idea's or comments on this ?

I am not very familiar with COMSOL in RF design and I am using 4.4 at the moment.

Thanks,
Ger