Strain-invariant stretchable radio-frequency electronics

Sun Hong Kim, Abdul Basir, Raudel Avila, Jaeman Lim, Seong Woo Hong, Geonoh Choe, Joo Hwan Shin, Jin Hee Hwang, Sun Young Park, Jiho Joo, Chanmi Lee, Jaehoon Choi, Byunghun Lee, Kwang-Seong Choi, Sungmook Jung, Tae-il Kim, Hyoungsuk Yoo () and Yei Hwan Jung ()
Additional contact information
Sun Hong Kim: Hanyang University
Abdul Basir: Hanyang University
Raudel Avila: Rice University
Jaeman Lim: Hanyang University
Seong Woo Hong: Hanyang University
Geonoh Choe: Hanyang University
Joo Hwan Shin: School of Chemical Engineering, Sungkyunkwan University (SKKU)
Jin Hee Hwang: Hanyang University
Sun Young Park: Hanyang University
Jiho Joo: Electronics and Telecommunications Research Institute
Chanmi Lee: Electronics and Telecommunications Research Institute
Jaehoon Choi: Hanyang University
Byunghun Lee: Hanyang University
Kwang-Seong Choi: Electronics and Telecommunications Research Institute
Sungmook Jung: Korea Research Institute of Chemical Technology (KRICT)
Tae-il Kim: School of Chemical Engineering, Sungkyunkwan University (SKKU)
Hyoungsuk Yoo: Hanyang University
Yei Hwan Jung: Hanyang University

Nature, 2024, vol. 629, issue 8014, 1047-1054

Abstract: Abstract Wireless modules that provide telecommunications and power-harvesting capabilities enabled by radio-frequency (RF) electronics are vital components of skin-interfaced stretchable electronics1–7. However, recent studies on stretchable RF components have demonstrated that substantial changes in electrical properties, such as a shift in the antenna resonance frequency, occur even under relatively low elastic strains8–15. Such changes lead directly to greatly reduced wireless signal strength or power-transfer efficiency in stretchable systems, particularly in physically dynamic environments such as the surface of the skin. Here we present strain-invariant stretchable RF electronics capable of completely maintaining the original RF properties under various elastic strains using a ‘dielectro-elastic’ material as the substrate. Dielectro-elastic materials have physically tunable dielectric properties that effectively avert frequency shifts arising in interfacing RF electronics. Compared with conventional stretchable substrate materials, our material has superior electrical, mechanical and thermal properties that are suitable for high-performance stretchable RF electronics. In this paper, we describe the materials, fabrication and design strategies that serve as the foundation for enabling the strain-invariant behaviour of key RF components based on experimental and computational studies. Finally, we present a set of skin-interfaced wireless healthcare monitors based on strain-invariant stretchable RF electronics with a wireless operational distance of up to 30 m under strain.

Date: 2024
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DOI: 10.1038/s41586-024-07383-3

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