Experimental rotary transformers for antenna power supplies and control [Antenna Designer's Notebook]

Pekka Eskelinen*

*Corresponding author for this work

    Research output: Contribution to journalConference articleScientificpeer-review

    4 Citations (Scopus)


    Rotary transformers can be effectively used for low-noise amplifier (LNA) or down-converter power supply and control signal transmission in scanning-antenna applications. Three air-core designs, utilizing a square wave at audio frequencies, using HCMOS logic and giving a 5 V/0.6 A dc power feed, are discussed. The constructions allow further installation of RF rotary joints or other coaxial hardware up to a diameter of 100 mm. They add about 30 to 80 mm to the overall height of the antenna, depending on application and requirements. Bearing replacement with such a transformer is also possible, if adequate tolerances are met and suitable coil-support materials are selected.

    Original languageEnglish
    Article number5687521
    Pages (from-to)164-167
    Number of pages4
    JournalIEEE Antennas and Propagation Magazine
    Issue number5
    Publication statusPublished - 1 Oct 2010
    MoE publication typeA4 Article in a conference publication


    • measurement radar
    • radar
    • radar power supply
    • radar scanner
    • rotary joint
    • Rotary transformer
    • transformers


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