SRACS - Self Resonant Air Coil Solver

SRACS calculates the resonant frequencies and quality factors of self-resonant air-coils.

SRACS is a collection of functions for the analysis of self-resonant air-coils. It was developed for the analysis of wireless power transfer systems, but may be suitable for other applications like metamaterials made of quasi-periodic resonator structures.
SRACS can compute nearly rotational symmetric wire coils, like spirals, screws or more complex structures with an arbitrary winding function.
SRACS consists of a very fast solver for eigenfrequencies, a post-processing routine to compute the quality factor and a system solver to examine magnetically coupled systems of resonators. For the computation of losses, skin-effect, proximity-effect and radiation are taken into account.
If you use this toolbox for publications, please cite
Breitkreutz, B.; Henke, H., "Calculation of Self-Resonant Spiral Coils for Wireless Power Transfer Systems With a Transmission Line Approach," in Magnetics, IEEE Transactions on , vol.49, no.9, pp.5035-5042, Sept. 2013
doi: 10.1109/TMAG.2013.2259634

A comprehensive description of the model (in German) can be found in

Breitkreutz, Bernd; "Simulation und Optimierung resonanter Übertragungsstrecken für drahtlose Energieübertragungssysteme," ISBN 978-3-8325-4117-0