A lattice matched InP chip set for a Ka band radiometer

Danielle Kettle, Neil Roddis, Rob Sloan

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    An extremely sensitive Ka band radiometer, operating at a temperature of approximately 15 kelvins, is being developed for the EC funded FARADAY radio astronomy project. To maximize the sensitivity of the radiometer lattice-matched indium phosphide HEMT technology has been used: all of the active components of the radiometer, with the exception of the detectors, have been manufactured on a single wafer process. The radiometer, which uses the band 26 to 36 GHz, will be used to make radio maps of the sky from a 32 metre diameter radio telescope. Several new MMICs have been designed, including a 10 GHz bandwidth low noise amplifier with average noise temperature less than 20 K, and a 180° phase switch using low noise HEMTs as the switching elements. Design principles are described, together with a comparison of modelled and measured results. © 2005 IEEE.
    Original languageEnglish
    Title of host publicationIEEE MTT-S International Microwave Symposium Digest|IEEE MTT S Int Microwave Symp Dig
    Number of pages3
    Publication statusPublished - 2005
    Event2005 IEEE MTT-S International Microwave Symposium - Long Beach, CA
    Duration: 1 Jul 2005 → …


    Conference2005 IEEE MTT-S International Microwave Symposium
    CityLong Beach, CA
    Period1/07/05 → …


    • Chip-set
    • InP
    • Ka Band
    • MMICs
    • Radiometry


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