Compact First-Order Probe for Spherical Near-Field Antenna Measurements at Low Frequencies

Oleksiy S. Kim

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    Guidelines for designing compact and lightweight first-order probes for spherical near-field antenna measurements at frequencies below 1 GHz that exploit first-order properties of electrically small self-resonant radiators combined into superdirective endfire arrays are established theoretically, exemplified numerically, and validated experimentally. A prototype of the probe designed to operate at a central frequency of 435 MHz exhibits the impedance bandwidth of 15 MHz with a directivity of more than 9 dBi and parasitic $|\mu |\ne 1$ spherical modes suppressed to at least −42 dB. The probe height is just 343 mm above a 720-mm circular ground plane and weighs about 5 kg.
    Original languageEnglish
    JournalI E E E Transactions on Antennas and Propagation
    Issue number7
    Pages (from-to)3684 - 3690
    Publication statusPublished - 2017

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    • Probes
    • Bandwidth
    • Antenna measurements
    • Antenna arrays
    • Frequency measurement
    • Dipole antennas
    • Electrically small antennas
    • Frequency bandwidth
    • Linear arrays
    • Physical bounds
    • Quality factor
    • Radiation
    • Spherical near-field (SNF)
    • Supergain antennas


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