3D thin film Guanella-balun

This paper describes modelling and design of a thin film balun, which can also incorporate a magnetic nanocomposite core. Even without having the magnetic core the novel thin film balun has outstanding properties: the operating bandwidth extends from 0,5 GHz to 12 GHz and the size is very compact. After discussing theoretical limitations of the bandwidth of the Guanella-balun, a two wire thin film transmission line is investigated as a building block with respect to its usability in a wideband balun and then optimized. The design of the balun is presented and simulation results are given. A balun having no magnetic core is manufactured and measurement results are presented.