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A Novel Compensation Strategy for the Radiation Characteristics of Large Dielectric Radomes Based on Phase Modification

To mitigate the degradation of radiation characteristics for large ground-reflector antennas due to dielectric radomes, a simple compensation strategy based on phase modification has been proposed. A modification of the phase distribution in the original aperture of an enclosed reflector antenna via moving the feed or subreflector along axial direction opportunely could compensate the phase shift caused by dielectric radome, minimize the phase difference in transmission aperture, and reduce the distortion of the antenna's far-field pattern. The movement of the subreflector could be calculated by a formula, which has been provided in this work based on geometrical optics (GO). Good compensated results are obtained in a 9.14-m one-piece dielectric sandwich radome. The proposed compensation strategy could also be applied to metal-space frame radome; a 20-m radome is presented to verify the results .