Abstract: Based on the actual shape of a distorted reflector, a novel divided-fit method (DFM) for fitting the distorted surface of a large reflector antenna is presented by combining hoop trigonometric function fitting and quadratic radial function fitting methods, and by using the Coons surface unit to fit each zone. The results of a 7. 3-m paraboloid antenna agree well with numerical simulations and radiation patterns, and show the accurate analysis of the distorted surface can be obtained by the DFM insteadof the best-fit paraboloid method.

Key words: distorted reflector antenna, divided-fit surface, radiation pattern, normal equations