Radiated Field and Energy From a Uniformly Moving Electromagnetic Plane Wave Source

ABSTRACT By using the finite‐difference time‐domain (FDTD) method, this paper investigates the electromagnetic waves generated by a uniformly moving plane wave source. The effect of the output impedance of the source is analysed, extending previous work. The numerical Doppler frequency shifts and amplitudes of the field, as functions of the speed of motion, are matched with curve‐fitting expressions. The total energy is also studied and new formulas are derived. It is shown that when the plane wave source is in motion, the total radiated energy decreases for all values of the output impedance.