Ultrathin Metasurface Design for Enhanced Wireless Power Transfer to Deep Tissue Implants

This paper introduces a destructive interference-based metasurface design that innovatively addresses multilayer tissue impedance mismatch for wireless power transfer (WPT) to implantable medical devices. Departing from conventional rigid cascaded structures or oversimplified single-layer models, our approach combines a flexible PDMS substrate with a Jerusalem cross resonator to unify air-skin-fat-muscle interface matching through phase cancellation. The key innovation lies in transforming complex multilayer into a single-layer interference problem via composite substrate equivalence, enabling near-zero reflection and near-ideal impedance (0.98−0.003j) at lossless condition. This methodology establishes a new paradigm for miniaturized, biocompatible IMD powering systems.