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  Antennas Calibration

Calibration of antennas and EMC site evaluation measurements

Narda STS measures antenna factors on a 17m x 13m metal ground plane.
The traceability is guaranteed by the validation of the site on reference to international standard with broadband antennas and accordable dipoles.
Calibration on O.A.T.S. can be performed over the frequency range 20 MHz to 18 GHz with the standard site method and the standard-antenna method.

Narda STS offers a measurement of free space antenna factor besides ANSI 63.5 and SAE ARP 958 antenna factor.

Antenna can be calibrated for a given height above the ground plane and a particular polarisation if required.


Until 50 MHz the monopole antenna (active and passive rod) are calibrated with the substitution method.
The loop antennas are calibrated inside an anechoic chamber by measuring the current in a primary loop and calculating the induction field. The loop to be calibrated is placed in this known field and the antenna factor is measured.
For more details about antennas calibration services at Narda STS download here PDF format the file in pdf format.

Antennas calibration services list PDF format


Narda STS also performs site evaluations:
  • Normalised site attenuation measurements in the frequency range 30 MHz to 1000 MHz.
  • O.A.T.S. or semi anechoic chambers - according to ANSI 63.4, CISPR 16-1, EN 50147-2
  • fully anechoic chambers - according to EN 50147-3.
  • Shielding attenuation in the frequency range 10 kHz to 18 GHz according to Mil-Std 285, EN 50147-1 and IEEE 299.
  • Transmission loss measurements in the frequency range 1 GHz to 18 GHz according to EN 50147-1 and ANSI C63.4, except that no height scan is performed because the floor is not reflective and the free space attenuation is taken as reference.
  • Field uniformity measurements in the frequency range 20 MHz to 18 GHz according to IEC 1000-4-3, EN 61000-4-3 or IEC 61000-4-3.
The antenna types measured are:


  • active and passive rod antenna (10 kHz to 200 MHz)
  • active and passive loop antennas (100 Hz to 32 MHz)
  • tuneable dipoles (25 MHz to 1,7 GHz)
  • biconical antennas (20 MHz to 2 GHz)
  • log-periodic antenna arrays (80 MHz to 5 GHz)
  • conical log spiral antennas (200 MHz to 10 GHz)
  • horn antennas (200 MHz to 26,5 GHz)
The antenna properties measured are:


  • free space antenna factor
  • ANSI 63.5 antenna factor
  • SAE ARP 958 antenna factor
  • Reflection coefficient
  • Balun unbalance
  • Radiation patterns
Tipical calibration results:


  • ANSI 63.5 10 meters biconical antenna factor
Biconical antenna factor example
  • balun unbalance
Balun umbalance example

For calibration booking please contact Roberto Grego
For technical enquiries please contact Gilberto Basso


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