Liquid Metal Elastomer Based Coplanar Waveguide Transmission Line for Stretchable and Self‐Healing RF Electronics

Insulating and conductive self-healing elastomers represent a high-potential paradigm shift in the development of soft radio-frequency (RF) electronics applications, such as coplanar waveguide (CWP) RF transmission lines. In this article, we present a novel stretchable, self-healing CPW RF transmission line that uses self-healing materials for both the substrate and the conductor. The used self-healing liquid metal elastomer composite achieves a conductivity of approximately 2000 S cm−1 at zero strain. S-parameter measurements of reflection (S11) and transmission (S21) were performed for the coplanar waveguide as the electrical length was uniaxially stretched up to 100%. The stretchable and self-healing CPW RF transmission lines maintain remarkable consistency in transmission response at 1–6 GHz when mechanically stretched at 0%–50% for 1000 stretch-release cycles. To the best of our knowledge, this is the first proof-of-concept demonstration of a fully self-healing CPW transmission line, paving the way for durable and reconfigurable soft RF devices. © 2026 The Author(s). Advanced Electronic Materials published by Wiley-VCH GmbH.