Transient Power Loss Density of Electromagnetic Pulse in Debye Media

This paper is to point out the mistakes of previous expression of power loss density of the electromagnetic pulse (EMP) in Debye media. We derive the precise expression of transient power loss density both from the electrodynamic (ED) approach and equivalent circuit (EC) approach. In the ED approach, the expression is derived from the energy conservative law and Debye equation. For the harmonic field, the expression reduces to the well-known formula. The physical meaning can be clearly explained in the EC approach. The expression derived from the EC approach is consistent with that from the ED approach. A 1-D example is used to show the negative power loss of the EMP in Debye media and the error of temperature rise calculated from the previous expression.