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A Novel and Compact Feed for Reflector antennas for C and Ku bands
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A novel dual-band feed for reflector antennas is presented. This feed is a combination of a novel circular Eleven feed for C band and a modified choke horn for Ku band. The circular Eleven feed has better rotational symmetry (i.e. BOR1 efficiency) and return loss performance as compared to linear Eleven feed. The choke horn has been designed to obtain optimal performance for both horn at Ku band and Eleven feed at C band. The combined feed has been characterized in terms of total feed efficiency of reflector antenna (60%) and coupling coefficient of C & Ku bands ( -18 dB) over all operating frequencies. An experimental model has been manufactured and measured. The measured results agreed well with the simulated ones. The circular Eleven feed in the prototype can easily be log periodically extended to cover more lower frequency bands (S & L). The dual-band feed is compact in size and can be a good candidate for satellite terminals and other applications.
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