The modified Gaussian beam as a simple near-zone reflector antenna feed model

The nature of the errors associated with the widely used far-zone feed models are investigated by comparing the radiated field against the exact field, at various observation distances, calculated by the spherical wave expansion (SWE) techniques. The proposed modified Gaussian-beam feed model is presented, and its near-zone accuracy is confirmed with results obtained using SWE. The improvement of the modified Gaussian-beam model over the far-zone feed model is shown on a typical reflector antenna geometry employing an axially symmetric hyperboloidal subreflector.<
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