Strong Coupling Optimization With Planar Spiral Resonators

TL;DR

This paper develops a model for designing planar spiral resonators that achieve high efficiency and strong coupling for wireless power transfer, enabling small, high-performance devices.

Contribution

It introduces a scale- and material-independent model for optimizing planar spiral resonators for wireless power transfer.

Findings

Achieved high Q factors comparable to larger systems

Demonstrated strong coupling over significant distances

Optimized small, handheld-sized resonators

Abstract

Planar spirals offer a highly scalable geometry appropriate for wireless power transfer via strongly coupled inductive resonators. We numerically derive a set of geometric scale and material independent coupling terms, and analyze a simple model to identify design considerations for a variety of different materials. We use our model to fabricate integrated planar resonators of handheld sizes, and optimize them to achieve high Q factors, comparable to much larger systems, and strong coupling over significant distances with approximately constant efficiency.