A circuit model for straight-to-bent microstrip line coupling

A full-wave parametric analysis of a straight-to-bent microstrip line coupling has been performed and an equivalent circuit of the structure has been proposed. The circuit is composed of lumped elements modeling the reactive phenomena and the spurious emission caused by the excitation of the higher order modes at the microstrip discontinuity. The numerical results show that the coupling phenomena are strongly dependent on the frequency and on the geometrical parameters of the structure.