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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