Abstract
AbstractThis paper shows theoretically and experimentally that the front‐fed offset Cassegrain (FFOC) antenna is suited as a multi‐beam antenna to be borne on an international satellite. First, the problems are identified for conventional reflector configurations. Then the beam deflection characteristics are shown numerically in the case where an FFOC reflector surface is used as a multibeam antenna. The performance of the test antenna is confirmed experimentally. From the measured results of a test antenna of 120 wavelengths, it is found that the reduction of the gain in the beam deflection within a circle of the visible radius of 10° is less than 1.8 dB which agrees well with the computed results. The cross‐polarization level is less than‐34 dB. Because the cross‐polarization component generated by the primary radiator is −40 dB, the cross polarization generated by the reflector system is quite small.
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