It is known that the phasor electric field intensity E(r) and phasor magnetic field intensity H(r) are defined by E(r,t) = Re{E(r)e*} and H(r,t) Re{H(r)ex} Proof that the average power density of the time-harmonic field, which is defined by 1 P (r) = *E(r,1)>H(r, 1)dt T can be expressed as P(r) Re{E(r) > H*(r)} Re x =