engleski

Improved Estimation of Radiated Fields of Unintentional Radiators by Correction of the Impedance Mismatch Between a Transverse Electromagnetic Cell and a Hybrid Coupler

Radiated fields of unintentional radiators can be estimated from the measurements performed in 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 electromagnetic cell and the hybrid coupler are inherently mismatched, which introduces an error in the measured results up to 8.5 dB. The methodology for correcting the measured results is proposed and it is validated on the measurements of a small loop. The methodology is applied to the measurements of two synchronous buck converters and their radiated fields are estimated.

electromagnetic interference, far-field radiation, radiated emissions, small loop, switched-mode dc–dc converter

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