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Proceedings Paper

A 30 to 100 GHz solid state noise source for millimetre-wave spectrometry
Author(s): J. W. Bowen
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Paper Abstract

Measurements of the dielectric and optical properties of materials (complex refractive indices, dielectric constants, magneto and electro-optic coefficients etc.) over wide ranges of frequency above 300 GHz are made by Fourier transform spectrometry and dispersive Fourier transform spectrometry. These techniques utilise mercury arc lamps as broadband noise sources with noise temperatures of about 2000 K. For frequencies below 300 GHz the spectrometric methods are still applicable but the power available from mercury arc lamps is very low (< 2000 K) and below about 100 GHz spectrometric measurements require long integration times to reach acceptable signal-to-noise ratios.

Waveguide mounted noise diodes are used for power calibration of microwave systems at frequencies below 60 GHz. They have fairly high noise temperatures but are limited in frequency coverage to a single waveguide band.

Paper Details

Date Published: 1 October 1991
PDF: 2 pages
Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15760Z (1 October 1991); doi: 10.1117/12.2297748
Show Author Affiliations
J. W. Bowen, Univ. of London (United Kingdom)

Published in SPIE Proceedings Vol. 1576:
16th International Conference on Infrared and Millimeter Waves
Minh Quang Tran, Editor(s)

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