• Bandwidth: 3kHz - 100MHz
• Frequency range: 10Hz - 100MHz
• Transfer impedance: 5 dB Ohm
• Connector type: N female
• Max primary current (RF): 12A

The TekBox TBCCP1-3K100 is a coaxial RF current monitoring probe designed to be used as a transducer for active loop antennas or for applications that need to measure RF currents in coaxial cables. The probe has a 3 dB bandwidth from 3 kHz to 100 MHz and very flat response from 9kHz to 30MHz. The probe is equipped with N-connectors. An attachment with a 1/4-inch thread permits connectivity to standard tripods.

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 in the image to the right: 

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