Analysis of two ALMA front-end receiver channels using physical optics

Mark Whale; Massimo Candotti; Neil Trappe; Anthony Murphy; Andrey Baryshev; Victor Belitsky

doi:10.1117/12.762749

14 February 2008 Analysis of two ALMA front end receiver channels using physical optics

Mark Whale, Massimo Candotti, Neil Trappe, Anthony Murphy, Andrey Baryshev, Victor Belitsky

Author Affiliations +

Proceedings Volume 6893, Terahertz Technology and Applications; 68930D (2008) https://doi.org/10.1117/12.762749
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

Abstract

The Atacama Large Millimetre Array will be a single research instrument composed of up to 50 high precision antennas, located at the Chajnantor plain in the district of San Pedro de Atacama, 5000m above sea level. Each ALMA telescope will contain 10 frequency channels/bands, ranging from 30 to 950GHz. Radiation from the secondary reflector is collected to the receivers of each wavelength channel through their accompanying front end optics. We present a full electromagnetic treatment of the front end optics for band 5 (163 - 211 GHz) and band 9 (602 - 720 GHz). A full quasi optical and physical optics analysis of the band 5 front end optics, using the antenna analysis tool, GRASP9 [1] is presented. Potential optimisation for the system is presented, namely a reflector edge taper and a comparison of two surface geometries. A similar analysis of the band 9 system is presented. Full electromagnetic simulations are compared with cold beam pattern measurements made at the Space Research Organisation of the Netherlands [2, 3]. Analysis of the effect of the polarizing grid is presented, with suggested modifications to improve cross polar levels.

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Mark Whale, Massimo Candotti, Neil Trappe, Anthony Murphy, Andrey Baryshev, and Victor Belitsky "Analysis of two ALMA front end receiver channels using physical optics", Proc. SPIE 6893, Terahertz Technology and Applications, 68930D (14 February 2008); https://doi.org/10.1117/12.762749

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