Transient radiation from a resistive, tubular antenna


  • Lennart Marin


The time dependence is calculated of the radiated field from a resistively loaded, tubular antenna excited by a step-function voltage across a circumferential delta gap. The resistive loading along the antenna is taken to be uniform and independent of frequency. Analytical expressions for the early-time and late-time behavior of the far field are derived. For intermediate time intervals the field is evaluated numerically. It is found that the late-time behavior of the radiation field is inversely proportional to time squared, whereas in the case of zero resistance it varies in inverse proportion to the logarithm of time.