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


To mitigate the degradation of radiation characteristics for giant ground-reflector antennas because of dielectric radomes, a easy compensation strategy based on section modification has been proposed. A modification of the section distribution in the first aperture of an indoor reflector antenna via moving the feed or subreflector along axial direction opportunely may compensate the phase shift caused by dielectric radome, minimize the part distinction in transmission aperture, and reduce the distortion of the antenna's way-field pattern. The movement of the subreflector could be calculated by a formula, that has been provided in this work primarily based on geometrical optics (GO). Good compensated results are obtained in a nine.14-m one-piece dielectric sandwich radome. The proposed compensation strategy could conjointly be applied to metal-house frame radome; a 20-m radome is presented to verify the results .

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