Extending the Bandwidth of a Superdirective First-Order Probe for Spherical Near-Field Antenna Measurements

Oleksiy S. Kim

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    Abstract

    A superdirective array of electrically small dipole radiators can effectively be used as a compact and lightweight first-order probe (a directive antenna radiating predominantly spherical modes with the azimuthal index |µ| = 1) in spherical near-field antenna measurements at low frequencies. This contribution shows that a very narrow frequency bandwidth peculiar to superdirective antennas can be extended to practical values by the proper design of the array elements as well as by relaxing the maximum directivity condition, while keeping |µ| = 1 modes dominating in the radiation spectrum of the antenna. The resulting probe has the relative bandwidth of 3% and directivity above 9 dBi; its height is 0.5λ over a 1λ circular ground plane.
    Original languageEnglish
    Title of host publicationProceedings of the 2015 International Symposium on Antennas and Propagation
    PublisherInstitute of Electronics, Information and Communication Engineers
    Publication date2015
    Pages603-605
    Publication statusPublished - 2015
    EventInternational Symposium on Antennas and Propagation : Advancing Antenna and Propagation Research for a Connected World - Hobart, Australia
    Duration: 9 Nov 201512 Nov 2015
    http://isap2015.org/

    Conference

    ConferenceInternational Symposium on Antennas and Propagation
    Country/TerritoryAustralia
    CityHobart
    Period09/11/201512/11/2015
    Internet address

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