Circuital and electromagnetic performances of planar microstrip spiral inductors for wireless applications

A full-wave FDTD analysis of a class of planar circular spiral inductors is presented. A locally conformal FDTD scheme is employed to analyze the circuital behavior and the spurious emission of inductors realized on a substrate of finite dimensions. Since the adopted model includes all the losses mechanisms taking place in the dielectric and metallic regions as well as the radiation phenomena due to the excitation of surface and volume waves it allows modeling accurately the relevant dynamic processes responsible for the structure behavior. The numerical results show that the circuital performances and the level of the radiated emission are significantly influenced by the inductor geometry as well as by the materials forming the structure.