TekBox TEM-CellThe Tekbox TEM cells (Transverse Electromagnetic Cell) are so-called "open TEM cells" because they have no side walls, so placing the DUT (Device Under Test) is easily possible. Although interference from the outside can penetrate into the cell, it can easily be identified by measuring the output signal of the cell when the DUT is switched off and can thus be taken into account in the measurement result. A TEM cell consists of a septum, the conductive level in the middle, and stainless steel outer walls connected to ground. The geometry is dimensioned to give an impedance of 50 Ω. The DUT is placed between the bottom wall (bottom) and septum.
Tekbox's TEM cells (stripline) offer better frequency response than standard TEM cells of the same size. TEM cells suffer from unwanted vibration modes at higher frequencies which limit the usable bandwidth. An outstanding design feature is the implementation of a resistor perpendicular to the propagation direction of the shaft. Higher-order modes and resonances are effectively suppressed.