Criteria for the field boundaries of an axially symmetric ultrawideband radiator

Criteria for the near and far electromagnetic fields of ultrawideband radiation are considered based on a numerical simulation. To estimate the field boundaries for ultrawideband radiation, it is proposed to use the condition of the maximum (near field) and minimum (far field) differences between the time dependences of the electromagnetic field components. The approach proposed has been approved for an axially symmetric radiator excited by voltage pulses of varied waveform and duration. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 46–50, September, 2008.