A Dual Ridge Broadband Orthomode Transducer for the 7-mm Band

作者：Reyes Nicolas^*; Zorzi Pablo; Pizarro Jose; Finger Ricardo; Patricio Mena F; Bronfman Leonardo

来源：Journal of Infrared Millimeter and Terahertz Waves, 2012, 33(12): 1203-1210.

DOI：10.1007/s10762-012-9942-6

• Orthomode transducer
• Waveguide components
• Dual ridge structure
• Q-band components

In this work we present a Q-band waveguide orthomode transducer (OMT) based on a dual ridge structure. It was designed to be used in astronomical projects were an excellent broad-band performance is mandatory. Of particular interest is the case of ALMA Band 1 (originally set at 31-45 GHz) project which will need several OMTs with outstanding performance and demonstrated manufacturability. By using a symmetrical structure, low cross-polar level and good input matching are achieved over a broad bandwidth (37 %). The proposed design incorporates an octagonal mode converter which allows the unit to be directly mated with the horn avoiding cross-polar issues at the interface. The OMT was designed to have a compact configuration and easiness of fabrication, both crucial features in projects where several units (up to 70) have to be constructed.

• 出版日期2012-12