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A new topology covering the new VGOS (VLBI Global Observation System) configuration is presented. The VGOS's requirement is a feed system covering from 2 GHz to 14 GHz. The new receiver topology is based on a log-spiral antenna printed on a conical surface. To achieve the dual circular polarization, an array of four elements is proposed. A proper balun for feeding the antenna and covering the whole...
VLBI2010 requires a feed that simultaneously has high efficiency over the full 2–14 GHz frequency range. The simultaneity requirement implies that the feed must operate at high efficiency over the full frequency range without the need to adjust its focal position to account for frequency dependent phase center variations. Two feeds meet this specification with some lacks to be fulfilled [1]: The Eleven...
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