Shielding of transient electromagnetic signals by a thin conducting sheet

The shielding effect of a t hin , horizontal imperfectly conducting sheet against t hc transient fi eld of a vertical magnetic dipole when excited by a ramp fun ction is inve t igated. The results are calculated by taking Laplace transforms of the frequency spectrum funct ions for t h e steady-state problem . The response to the ramp fUDction is calculated and the s ign ificance of t he results in shieldin g against surges is discussed.