Ling Kenyu, Kim Hyung Ki, Yoo Minyeong, Lim Sungjoon
School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 156-756, Korea.
Sensors (Basel). 2015 Nov 6;15(11):28154-65. doi: 10.3390/s151128154.
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%.
在本研究中，我们展示了一种新型的X波段频率可切换超材料吸波器。将液态金属合金共晶镓铟（EGaIn）注入刻在聚甲基丙烯酸甲酯（PMMA）上的微流体通道中，以实现频率切换。给出了两种情况的数值模拟和实验结果：微流体通道为空时以及充满液态金属时。为评估所制备的吸波器原型的性能，使用矩形波导对其进行了测试。注入液态金属后，谐振频率成功地从10.96 GHz切换到10.61 GHz，同时吸收率保持高于98%。
