Frequency-Switchable Metamaterial Absorber Injecting Eutectic Gallium-Indium (EGaIn) Liquid Metal Alloy

Sensors

Kenyu Ling²  Hyung Ki Kim²  Minyeong Yoo²  Sungjoon Lim¹ 

[1] School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 156-756, Korea;

关键词: metamaterial;    resonance;    microfluidics;   

DOI  :  10.3390/s151128154

来源: mdpi

【 摘 要 】

In this study, we demonstrated a new class of frequency-switchable metamaterial absorber in the X-band. Eutectic gallium-indium (EGaIn), a liquid metal alloy, was injected in a microfluidic channel engraved on polymethyl methacrylate (PMMA) to achieve frequency switching. Numerical simulation and experimental results are presented for two cases: when the microfluidic channels are empty, and when they are filled with liquid metal. To evaluate the performance of the fabricated absorber prototype, it is tested with a rectangular waveguide. The resonant frequency was successfully switched from 10.96 GHz to 10.61 GHz after injecting liquid metal while maintaining absorptivity higher than 98%.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.