• Bandwidth: 2kHz - 70MHz
• Frequency range: 10Hz - 100MHz
• Transfer impedance: 0 dBΩ when loaded with 50Ω
• Connector type: N female
• Max primary current (RF): 12A

The TekBox TBCCP1-2K70 is a coaxial RF current monitoring probe designed to be used as a transducer for large loop antennas or for applications that need to measure RF currents in coaxial cables. The probe has a characterized frequency range of 10Hz to 100MHz and a 3dB bandwidth of 2kHz to 70MHz. With a trans-impedance of 0 dBΩ, it is compliant with the specifications for large loop antennas (LLA) in CISPR 15 (EN 555015) and CISPR 16-1-4. 

TekBox coaxial RF current monitoring probes are ideal transducers for active and passive magnetic loop antennas. Combining the transducer with a corrugated coaxial cable forms a magnetic loop antenna. Below are examples of a 60 cm and 30 cm passive loop antenna:

The shield of the coaxial cable provides shielding from electric fields. As the shield would create a shorted winding in parallel to the center conductor, the shield has to be slotted and stiffened with a sleeve as shown here:

When using the probe with loop antennas for EMC testing applications, the model TBCCP1-3K100 probe is for use with active loop antennas, and the model TBCCP1-400K600 is for use with passive loop antennas, while this version, TBCCP1-2K70, is for use with large loop antennas. 

TekBox coaxial RF current probes do not need a calibration fixture for the measurement of the transfer impedance. See the figure below for transimpedance measurement set up: 

Calculate the transfer impedance ZT using the formula below:

ZT [dBΩ] = Pin [dBm] – Pprobe [dBm] +34 dB

or simply

ZT [dBΩ] = S21 [dB] +34 dB