Time-Domain Analytical Expression for Far Radiation Field of Arbitrarily Oriented Dipole above Layered Half Space

Using the frequency-domain far field analytical expression of the arbitrary orientation dipole above the layered half space, combined with the frequency-domain to time-domain conversion relationship and the Fourier transform, the time-domain far field analytical expression is derived. The far field analytical expression contains the convolution of the incident source and the time-domain reflection coefficient. The method has clear physical concept and simple calculation, and has the advantage of obtain wide frequency band information with Fourier transform. The numerical results prove the validity and correctness of the proposed method.