Prediction and Analyze of PCB Common-Mode Radiation Based on Current-Driven Mode

Common-mode radiation commonly exists in electronic products. It is the main reason for the failure work and fall of radiation test of electronic products. The PCB ground plane inductance is the major factor of producing common-mode radiation. This paper uses the Gauss theorem and the Amp loop theorem to solute the Maxwell´s equations to get the mathematical expression of the PCB ground plane inductance, and simplifies the derivation process and the complexity of the expression through the partial approximate substitutions. The result is testified by experiment. Through modular analysis of common-mode radiation, together with the PCB ground plane inductance got in this paper, the mathematical expression of current-driven common-mode radiation is got. Using the closed-form expression, calculations can be performed quickly and easily.