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W-band radiometer system with switching front-end for multi-load calibration

: Weissbrodt, E.; Kallfass, I.; Hülsmann, A.; Tessmann, A.; Leuther, A.; Massler, H.; Ambacher, O.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Geoscience and Remote Sensing Society:
IGARSS 2011, IEEE International Geoscience and Remote Sensing Symposium. Proceedings : July 24-29, 2011, Vancouver, Canada
New York, NY: IEEE, 2011
ISBN: 978-1-4577-1003-2 (Print)
ISBN: 978-1-4577-1005-6
International Geoscience and Remote Sensing Symposium (IGARSS) <2011, Vancouver>
Fraunhofer IAF ()
radiometer; direct detection; W-band; calibration; MMIC; mHEMT; millimeter wave switch; active loads

A W-band Dicke type radiometer with an MMIC single-pole-five-throw (SP5T) switch front-end and a Schottky diode detector is presented. The radiometer is intended to test active W-band loads as well as to generate passive millimeter wave imagery. By applying active or conventional hot and cold loads to the spare input ports of the SP5T, the radiometer can switch between the antenna, the external reference loads, and a monolithic integrated 50 load. Hence, accurate radiometric multi-load calibration can be performed as well as standard Dicke operation.