Analysis and calculation of damping used in random coupling model

Random coupling model(RCM) for key parts of the complex electronic systems cavity to predict pulsed electromagnetic interfrence is a new method in studying high power microwave effects, while the damping of cavity is a key factor determining the effect of this statistical forecasting method. The effects that the cavity reactance varies with frequences is discussed in the first part of the paper. Then a new idea using the real part of cavity reactance vs radiation reactance to calculate the damping quickly is put forward. The method using matrix eigen values and comparison between radiation and scattering resistances is proposed to verify the feasibility of the new idea.