Antenna Factor for Loop Antennas

Project Description

One magnetic field pickup coil, Rohde Schwarz HZ-10, S/N 100149 will be circulated. The measured free field antenna factor of a loop antenna is defined by the ratio of the incident H-field (measured in A/m) to output voltage (measured in V) across a conventional 50 Ω load. The antenna factor shall be computed at frequencies between 10 Hz and 10 MHz (9 points per decade).

The complex reflection coefficient S11 at the BNC connector shall also be measured, but it is not part of the comparison.

The technical protocol can be downloaded here>>

Final Report 2015-04-08

The comparison has been completed and results are published in the KCDB.

The comparison of a loop antenna factor measurement has been performed. One of the motivations for this comparison was that since the last comparison in this field (CCEM.RF-S21.F),­ several National Metrology Institutes have implemented the calibration capabilities for antenna measurements. The second motivation is that the loop antennas are typically working over a large frequency range, in this case 10 Hz to 30 MHz. For the calibration over this frequency span, two ranges are distinguished: the low frequency range where Alternating Current (AC) techniques should be used, and the high frequency range where Radio Frequency (RF) measurement techniques are applied. The comparison shows that the participants were able to measure within the declared uncertainties.l

Electricity and Magnetism (EM)
Frédéric Pythoud, METAS (Switzerland)
Phone: +41 31 32 33 335
Fax: +41 31 32 33 210
Coordinating Institute
METAS (Switzerland)