Analysis of two identical parallel arbitrarily located thin asymmetrical antennas

A method is presented for analysing two parallel arbitrarily located thin asymmetrical antennas. It is assumed that the system is point-symmetric, and current distributions along the dipoles are approximated to by polynomials with complex coefficients. Starting from the solution for this basic structure, three cases are analysed. The first is that of two identical, halfwave and fullwave parallel symmetrical dipoles in 45° echelon and when collinear, for which results according to the Chang-King 5-term theory are available. The simplest 2nd-order polynomial approximation of current results in self and mutual admittances which are in very good agreement with those of Chang and King, and only if very accurate current distribution is desired need the 3rd-order polynomial approximation be used. In addition, an asymmetrical dipole with a parasite and a sleeve dipole with a parasite are analysed starting from the basic structure and making use of superposition.