Analysis the Impedance of the Dual Trailing Wire Antenna(DTWA) on an Aircraft

The Dual Trailing Wire Antenna(DTWA) on an Aircraft antenna system is used to transmit VLF/LF messages to submarines.The DTWA is formed of a Short Trailing Wire Antenna(STWA) and a Long Trailing Wire Antenna(LTWA),the total length of both wires is about one-half of a wavelength.In the paper we mainly talk about a method about computing the impedance of the Dual Trailing Wire Antenna(DTWA).We build the model of antenna through analysis the antenna′s state,and work out the impedance of the antenna.For we must use the method of air dynamics to analysis antenna′s shape,it is very complicated,but the result is higher precise.