基于PDMS衬底的可延展柔性倒F天线设计

Design of stretchable inverted-F antenna based on PDMS substrate

近年来物联网的快速发展带动可穿戴领域迅速崛起,体域网的出现对可穿戴设备的无线收发提出了新需求:在生物医疗应用中要求收发天线能够适应拉伸弯曲形变.传统天线制作在刚性衬底上,不具有柔性,而且天线在拉伸条件下发生形变,工作频率迅速变化导致性能退化,难以满足柔性系统的需求.本文针对此类需求,在柔性衬底PDMS材料上设计了一款可延展柔性倒F蓝牙天线,通过辐射臂曲流形走线和地平面的分割设计,天线的可延展柔性得以实现.仿真结果显示,设计的天线在保证工作频带完全覆盖蓝牙频段的条件下,X轴向上可做到最大20%的拉伸,Y轴向上可做到60%的拉伸,同时可承受最小曲率半径为8 mm的弯曲.

In recent years,the rapid development of the Internet of Things（IoT） has led to the rapid rise of wearable devices,and the emergence of body-area networks（BANs） has resulted in new demands for antennas.In some areas,such as biomedical applications,antennas are required to not only be stretchable,but also bendable.Traditional PCB antennas,usually fabricated on a rigid substrate,can hardly stretch or bend and are not suitable for wearable devices physically and electrically because,once stretched,the antenna＇s length will increase,resulting in a lower center frequency.In this paper,a stretchable flexible inverted-F antenna based on a PDMS substrate is designed that operates in the Bluetooth band.Because of the design of the meandered-line radiation arm and the division of the ground plane and flexible substrate,a stretchable inverted-F antenna is achieved.Simulation results of the antenna during stretching and bending show that the designed antenna is able to stretch up to 20% in the X axis,60% in Y axis,and to bear bending with a minimum radius of curvature of 8 mm while still fully covering a Bluetooth band.