In this paper, the scanning characteristics of the feed clusters are investigated using Conjugate Field Match (CFM) for a single aperture on-board reflector antenna. By calculating the receiving fields in different incoming wave directions, the variation of the scanning characteristics of the 7-feed cluster at different longitudinal defocusing distances is analyzed. The simulation results show that longitudinal defocus can improve the scanning characteristics at larger scanning angles and provide a reference for the design of starborne antennas.
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