Implementation of a quasi-optical f-space s-parameters measurement system

Maffei, B., Legg, S., Robinson, M., Ozturk, F., Ng, M. W., Schemmel, P. and Pisano, Giampaolo ORCID: https://orcid.org/0000-0003-4302-5681 2013. Implementation of a quasi-optical f-space s-parameters measurement system. Presented at: 35th ESA Antenna Workshop on Antenna and Free Space RF Measurements, Noordwijk, The Netherlands, 10-13 September 2013.

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Abstract

A quasi-optical (QO) free-space test bench, based ontwo dual reflector Compact Test Range (CTR) systems,has been developed to characterise the RF properties ofmaterials and QO components used in mm-waveastronomical instrumentation. While this facility hasbeen designed to operate for several spectralbandwidths, in the first instance measurements havebeen performed in the W-band (75-110 GHz). Wepresent the modelled and measured performance of thetest bench and the procedure for calibrating andmeasuring samples under test. First measured results ofthe field across a 10 cm quiet zone indicate a maximumintensity variation of -4.5 dB and a maximum phasevariation of 7°. Measurements of the cross-polarisationindicate higher levels than were predicted. A free-spacecalibration method has been developed based on the useof 3 calibration standards (Thru-Reflect-Line). Initialmeasurements of the reflectivity and transmittance for arange of materials have been performed, allowing thededuction of the refractive index.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Completion
Status:	Unpublished
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	CTR, compact test range, characterisation
Last Modified:	27 Oct 2022 08:29
URI:	https://orca.cardiff.ac.uk/id/eprint/62472

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