Calculation of time-domain near-field Ex, y, z(t) from Hx, y(t) with PWS and FFT transforms

A calculation method of the E-field components Ex, y, z(t) from Hx, y(t) in time-domain is presented. The H-field radiation is generated by considering an ultra-short excitation current. The proposed method is based on the combination of the Fourier and plane wave spectrum (PWS) transforms associated with the Maxwell-Ampere relation. The relevance of the method was confirmed by considering a set of dipoles placed arbitrarily in the horizontal plane and excited by a pulse current of 0.6 ns width at half-height. Magnetic field components Hx, y(t) were calculated in the rectangular plane above the dipoles at different heights in the near-field range. It was demonstrated that extracted Ex, y, z(t) fields were in good agreement with the analytical results.