Tekbox TBTC1 - Open TEM Cell for EMC Pre-Compliance Testing, 50mm Septum


The Tekbox TBTC1 is the S-version of the Tekbox TEM-cell, Devices under test can be up to 120 x 120 x 40 mm and for thesting frequencies up to 3 GHz.

A TEM cell is a stripline device for radiated emissions and immunity testing of electronic devices. It is not a replacement, but due to its size and cost it is a convenient alternative to measurements in an anechoic chamber.

A TEM cell consists of a septum, the conductive strip in the centre section and walls which are connected to ground. The geometry is designed to present a 50Ω stripline. The device under test (DUT) is placed in between the bottom wall and the septum.

The TBTC1 is a so called “open TEM cell”, which got no side walls for convenient placement of the DUT. It may pick up RF background noise, which however can be taken into account by doing a measurement of the cell output signal before powering on the DUT.

The TBTC1 got a better frequency response compared to standard TEM cells of similar size. TEM cells suffer from higher order wave modes which limit the usable bandwidth. A unique design feature of the TBTC1 implements resistance perpendicular to the desired propagation direction of the wave. Consequently higher order wave modes and resonances are suppressed.
The device is supplied together with a 50Ω/25W RF termination and a DC block to protect the spectrum analyzer or RF receiver input.

Technical Data:

  • Length: 390 mm
  • Width: 200 mm
  • Height: 108mm
  • Septum height: 50 mm
  • Rectangular area under the septum: 19 cm x 13 cm x 5 cm
  • TEM cell connectors: N-female
  • Nominal cell impedance: 50 Ohm
  • Wave impedance: 377 Ohm
  • Maximum RF input power: 25W (limited by supplied 50 Ohm Termination)
  • Input return loss: S11 up to 1.2 GHz < -20dB, up to 2.1 GHz < -17dB, up to 3GHz < -14dB
  • Transmission loss: up to 1.4 GHz < 1 dB, up to 2.1 GHz < 3dB, up to 3 GHz < 6dB

DC-Block 50V-6GHz-N

  • Connectors: N-Male/Female
  • Nominal impedance: 50 Ohm
  • Max. continuous RF power: 2W
  • Max. continuous RF voltage: 50V RMS
  • Frequency: 500kHz to 6 GHz
  • VSWR: ≤ 1.2

RF-Termination 50Ω-3GHz-25W-N

  • Connector: N-Male
  • Nominal impedance: 50 Ohm
  • Max. continuous RF power: 25W
  • Frequency: DC to 3 GHz
  • VSWR: ≤ 1.2
  • Third order intermodulation: ≤ 120 dBc