A Ka-band InP MMIC 180° phase switch

D. Kettle, N. Roddis, R. Sloan

    Research output: Contribution to journalArticlepeer-review


    A new type of Ka band (26 to 36 GHz) 180 degree phase switch (bi-phase modulator) monolithic microwave integrated circuit has been developed for the EC funded FARADAY radio astronomy project. This integral component forms part of a chip set for a very low noise switching radiometer operating at a temperature of approximately 15 K. 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. Design principles are described, together with a comparison of modeled and measured results. The results show an average insertion loss of 3.5 dB, return loss of better than 10 dB and an average phase difference close to 170° ± 10° the 26-36 GHz band. © 2005 IEEE.
    Original languageEnglish
    Pages (from-to)425-427
    Number of pages2
    JournalIEEE Microwave and Wireless Components Letters
    Issue number6
    Publication statusPublished - Jun 2005


    • Cosmic microwave background (CMB)
    • HEMT
    • Monolithic microwave integrated circuit (MMIC)


    Dive into the research topics of 'A Ka-band InP MMIC 180° phase switch'. Together they form a unique fingerprint.

    Cite this