Dual-band flexible and stretchable microwave absorption metasurface based on liquid metal

Deformable metasurfaces have a broad application scope and frequency range, making them ideal for conformal tensile devices. However, current designs suffer from strain-induced frequency shifts, angle sensitivity, and narrow bandwidth. This study develops a flexible and stretchable microwave absorber metasurface (FSMAM) using a liquid-metal microfluidic network with a multi-loop topological structure. It operates efficiently in the S/C bands (2.8-3.3 GHz/6.5-7.3 GHz), with approximately 90% absorption. The simulation results show that high efficiency can still be maintained at a tensile strain of 30%, and the resonant frequency shift is controlled within < 0.7 GHz. The absorber maintains performance from 0° to 30°, overcoming angular limitations. Experimental results validate its promise for radar stealth, intelligent skins, and future 6G devices.