Transient and Steady-State Antenna Pattern Characteristics for Arbitrary Time Signals

摘要

This report presents a simplified method for the analytical determination of the transient and steadystate pattern characteristics of an antenna for arbitrary time signals and arbitrary aperture distributions. For uniform aperture illumination, the pattern response of an antenna for any time signal, no matter how complicated, can be found through simple shifts of the signal, and both the transient and the steady-state behavior can be determined without performing any integration. Examples are given for responses to suddenly applied excitations, to rectangular pulses, to excitations for electronic scanning, and to time signals in a pulsecompression system. For pulse signals, a steady state is not reached in any given direction, theta, if the duration of the pulse T is less than (a/c) sin theta, where a is maximum aperture dimension and c is velocity of light. Graphical representations for easy interpretation of the different states of pattern characteristics are included. (Author)