Analytical prediction of common mode noise in a source stirred reverberation chamber

A multiple antenna source stirring technique is analytically studied and adopted to compute the common mode voltage induced across a cable terminal impedance. Sixty-two monopoles are distributed on the chamber walls. Chamber realizations are enhanced by feeding two antennas at a time so achieving a total of 1891 combinations. A cable loaded by a common mode impedance is inserted as device under test (DUT) inside the chamber. Both high frequency and low frequency cases are considered comparing the maximum values of the induced common mode voltage. In the model, all mutual coupling among the transmitting antennas and the DUT are accounted for. In the lower frequency range, undermoded condition, the technique takes benefit from the adoption of an out-of-phase feeding of each active couple of antennas. The electric field direction can be forced by a proper choice of the two active antennas.