Port current and voltage expression for current distribution along wire elements of array antenna

摘要

An array factor is calculated from currents on each element by using a steering vector. Current distribution along each element (vector effective length) must be considered in the current for a precise calculation. For it, a formulation by using both a port current and a port voltage is proposed. Here, a port means a point on an antenna element, where a feed line, a varactor or some electronic device is joined. This formulation can be adopted not only to ESPAR (Electronically Steerable Parasitic Array Radiator) antenna but also to an ordinary array antenna. By this formulation, mutual coupling, impedance matching and current distribution along wire elements can be considered in a calculation of antenna characteristics.