PULSED EM MUTUAL COUPLING BETWEEN PARALLEL WIRE ANTENNAS

This chapter analyzes the pulsed electromagnetic (EM) interaction between parallel straight wire segments in an antenna array. The problem configuration consists of a set of mutually parallel wire segments that can be excited by an incident EM plane wave or/and by delta‐gap sources. The chapter shows an example of the problem under consideration. At first, the scattered EM wave fields pertaining to the antenna array are interrelated with the testing EM field state via the EM reciprocity theorem of the time‐convolution type. Under the thin‐wire assumption, the reciprocity relation is approximated by the corresponding on‐axis interaction quantity consisting of self and mutual interaction terms. Subsequently, the resulting interaction quantity is approximated through a piecewise linear space‐time basis, which results in the electric‐current distribution along antenna elements via the marching on‐in‐time scheme. Following the described strategy, it is straightforward to extend the partitioned matrix description to a larger system of (mutually parallel) wire antennas.