A novel toroidal inductor structure with through-hole vias in ground plane

This paper presents a new toroidal inductor topology that can be realized in microstrip or stripline configuration. The toroidal structure comprises two sets of mutually isolated multiple-coupled lines that are connected by vias through a ground plane. This geometry facilitates a simple equivalent-circuit model for accurate analysis or synthesis of the component. A comparison between the new toroidal structure and the conventional spiral inductor topology shows good improvement in quality factor and a footprint reduction over 300%. The toroidal designs are validated by full-wave electromagnetic simulation, as well as by measurement for a two-turn toroidal inductor in microstrip configuration.