A preliminary evaluation of the effect of a dielectric WB TEM cell manipulator on radiated emissions test results

The action by the Federal Communications Commission of the United States, allowing WB TEM radiated cell data to be submitted for type certification measurements, places renewed emphasis on full automation and rapid conduct of these measurements. To allow full automation of radiated emissions testing, an equipment under test (EUT) manipulator has been constructed from dielectric materials, to minimize the interaction of electromagnetic signals originating in the EUT with the manipulator. Since the presence of additional non-EUT materials in the test volume of the WB TEM cell may interact with the coupling mechanism of the signals to be measured in the cell, it is desirable to evaluate the impact of such interaction of EUT fields with the manipulator. The paper describes preliminary evaluation of the impact of the presence of the dielectric manipulator on radiated emissions test results