Radiated fields of unintentional radiators can be estimated from the measurements performed by a transverse electromagnetic cell. A hybrid coupler connected to the outputs of the transverse electromagnetic cell separates the electric and magnetic coupling, which allows to calculate the generated far-field radiation consistently. However, the transverse electro-magnetic cell and the hybrid coupler are mismatched which introduces an error in the measured results. The error of up to 8.5 dB is obtained in the measurements of the small loop. The impedance mismatch is dominantly a consequence of the phase shift which is related to the propagation of the signal through the measurement setup and which is present even if all elements of the measurement setup are ideal. The methodology for correcting the measured results is proposed and it is validated on the measurements of the small loop. The methodology is applied to the measurements of two synchronous buck converters and their radiated fields are estimated.

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