Arcetri Astrophysical Observatory

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logosmallarcetri Arcetri Technical Reports 4/2013


ALMA Band2/3 - WP4: Passive Components II

Orthomode Transducer - Electromagnetic and Mechanical Study

L. Carbonaro, L. Cresci, R. Nesti, D. Panella

INAF Osservatorio Astrofisico di Arcetri

Abstract

This report shows the results about the electromagnetic study of circular corrugated horns to be used as feed for the ALMA radio telescope. The study first addresses the specifications of the ALMA band 2, 67-90GHz; it is then investigated the way to extend the operative band also to the ALMA band 3, 84-116GHz, thus resulting in a horn operating in the full 67-116GHz joint bandwidth. Simulation results show the possibility to have a high performance feed covering the whole 67-116GHz ALMA band. Two different designs are here presented, both addressed to machining tool standard fabrication, one for band 2 and the other for band 2/3. This report is done in the framework of the 'ALMA band 2/3' project funded by ESO. 

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