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In this paper we present the design, construction and characterization of a broadband Orthomode Transducer (OMT) for the new Band 2+3 of the Atacama Large Millimeter/Submillimeter Array (ALMA). The term Band 2+3 (67–116 GHz) refers to the recent proposal of covering current Bands 2 and 3 with a single dual-polarization broadband receiver. One of the key components of the future receiver is the polarizer,...
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...
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