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Proceedings Paper

Electrical standing waves in the HIFI HEB mixer amplifier chain
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Paper Abstract

The Heterodyne Instrument for the Far-Infrared (HIFI) is one of three instruments to be launched aboard the Herschel Space Observatory (HSO) in 2009. HIFI will provide unprecedented spectral sensitivity and resolution between 490-1250 GHz and 1410-1910 GHz. In this paper, we report on the analysis of electrical standing waves that are present between the hot electron bolometer (HEB) heterodyne mixing element and the first low noise amplifier in the HIFI instrument. We show that the standing wave shape is not a standard sinusoid and difficult to remove from the resulting spectrum using standard fitting methods. We present a method to remove the standing waves based on data taken during the HIFI instrument level test, and anticipate the use of a similar calibration procedure in actual flight. Using the standing wave profile we obtain direct evidence of the complex IF output impedance of the HEB mixer.

Paper Details

Date Published: 10 February 2009
PDF: 10 pages
Proc. SPIE 7215, Terahertz Technology and Applications II, 72150L (10 February 2009); doi: 10.1117/12.811127
Show Author Affiliations
Ronan D. Higgins, National Univ. of Ireland, Maynooth (Ireland)
SRON Netherlands Institute for Space Research (Netherlands)
Jacob W. Kooi, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 7215:
Terahertz Technology and Applications II
Kurt J. Linden; Laurence P. Sadwick; Créidhe M. O'Sullivan, Editor(s)

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