Time domain reciprocity and the transfer response of coupled antennas

Abstract

A direct time domain based derivation of the transfer response of two parallel dipole antennas in close proximity is performed by using two types of reciprocity theorems: convolution type and correlation type. The two formulations differ in the temporal mutual action between the time dependent quantities involved in the reciprocity process. Using an approximate expression for the dipole's current gives a convenient expression for the transfer response that can further be used for the analysis of the roles of different delayed wave-field contributions and causality.