HPassive Loop Antenna / Transducereading
TBMA6-P PASSIVE LOOP ANTENNA
The TBMA6-P is a passive Loop Antenna, expanding the TekBox product range of affordable EMC pre-compliance test equipment.
The loop antenna is designed for radiated emission measurements in the frequency range of 9 kHz – 30 MHz, according to CISPR 16. The loop antenna has a diameter of 60 cm and provides sufficient sensitivity to carry out all relevant measurements specified in the corresponding CISPR standards for the frequency range of 9 kHz – 30 MHz
The loop is built from a corrugated coaxial cable and attached to the transducer with N-connectors. This construction provides flexibility to use it with various loop diameters. An attachment with a ¼” thread permits connectivity to standard tripods.
Antenna factors
A spectrum analyzer or measurement receiver connected to the antenna will typically display measured power in dBm or voltage in dBµV. The antenna factor AF is an antenna and frequency dependent parameter, which is required to convert the measured voltage into the corresponding electric or magnetic field strength.
For magnetic field strength:
H[dBµA/m] = V[dBµV] + AFH[dB/Ωm]
Where AFH is the magnetic antenna factor in [dB/Ωm] or [dBS/m]
In the far field, the free space impedance Z0 = 377 Ω links electric field strength with magnetic field strength.