Time-Domain Far-Field Analysis of Radiation Sources and Point-Source Coherence

A procedure called FARS (Far-field Analysis of Radiation Sources) has been previously described by the author as a means of determining the quantitative contribution per unit length or per unit area to the power radiated from some object in either the frequency domain or the time domain. Just as frequency-domain and time-domain solutions provide complementary perspectives of general electromagnetic phenomena, so do Frequency-Domain FARS (FDFARS) and Time-Domain FARS (TDFARS) for their particular applications. For example, a time-domain solution enables separating various effects due to their different time delays to the far field. TDFARS can thus be useful in demonstrating the effect of the time-space coherence of propagating charge/current pulses as they meet, when propagating along a perfectly conducting wire. Some results concerning this effect are included, as well as their correlation with the time variation of current and charge energy measures.