Superdirective Magnetic Dipole Array as a First-Order Probe for Spherical Near-Field Antenna Measurements

Oleksiy S. Kim, Sergey Pivnenko, Olav Breinbjerg

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    Abstract

    The theory as well as numerical and experimental results are presented for a superdirective array composed of closely spaced electrically small resonant magnetic dipole elements. The array operates on a metal ground plane and can exhibit a maximum directivity of 11.5 dBi, 15.2 dBi, and 17.8 dBi (including 3 dB due to the ground plane), for 2, 3, and 4 magnetic dipoles, respectively. The array is self-resonant and is directly excited by a 50-ohm coaxial cable through the ground plane. The array radiates essentially the $\vert\mu\vert=1$ spherical modes, which, despite a narrow bandwidth, makes it an excellent first-order probe for spherical near-field antenna measurements at low frequencies.
    Original languageEnglish
    JournalI E E E Transactions on Antennas and Propagation
    Volume60
    Issue number10
    ISSN0018-926X
    DOIs
    Publication statusPublished - 2012

    Keywords

    • Electrically small antennas,
    • First-order probe
    • Magnetic dipole
    • Spherical near-field antenna measurements
    • Superdirectivity
    • Supergain array

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