Comparison of the Modelled and Measured Antenna Radiation Pattern of a Parabolic Reflector Using FSV
L. Gregory Hiltz and Bruce Archambeault
Department of National Defence (Canada), IBM
A validation study was performed on a measured and modelled antenna radiation pattern (ARP) from a parabolic reflector to assess the limitations of a simple 2D aperture model for this type of antenna. The free-space ARP was calculated using the Method-of-Moments solver implemented in FEKO, with the source modelled as 2D aperture with a parabolic illumination taper. The agreement between modelled and measured data was assessed using feature selective validation (FSV) methods, and showed that this approximate model provided sufficient accuracy within the main lobe of the ARP, down to about 18 dB below the lobe maximum. Sidelobes and nulls were not accurately predicted by this approximate model. The FSV method was applied to angular regions about the main lobe in the ARP, and indicated the expected increase in agreement between modelled and measured gain as the regions were successively restricted. The FSV method was demonstrated to be a useful tool that can assess the agreement between features in an ARP, and showed that a large component of the main lobe can be accurately calculated with FEKO using only a simple 2D aperture model for the antenna.
25th Annual Review of Progress in Applied Computational Electromagnetics
2009
March
173-177
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