Application value of slow decay behavior of energy density excited by electromagnetic pulses

By comparing the radiated energy densities excited by the continuous wave ( CW), the sinusoidal pulse, the Gaussian pulse and the rectangular pulse res pectively with the same energy, it is shown that the pulses are not more ef ficient than CW in the energy transmission. For the sinusoidal pulse and th e CW, the radiated energy densities are the same in far zone. The radiated energy density of the Gaussian pulse is equal to the one of CW in far zone when the pulse width equals 1/2 pi of the CW's period To. The energy transm ission of pulse is more efficient only in the case of tau <T-0/2 pi. For th e rectangular pulse, the radiated energy density is equal to the one of CW in far zone when the maximum of frequency spectrum is 10f(0) (f(0)=1/T-0) a nd the pulse width is To. The numerical results and theoretical analysis in this paper show that the application value of the slow decay behavior of t he energy density excited by electromagnetic pulses is limited.