The equivalent circuit of two-port antennae with an application to magic-T systems

An equivalent circuit is presented for a two-port antenna immersed in the field of an external source. The circuit consists of admittances and current generators, and the value of the latter is particularly simple when the irradiating wave is a plane wave. The existence of a plane of symmetry also simplifies matters, particularly when the two output ports are connected to the series arms of a magic-T.