Compact and Low-Profile UWB Antenna Based on Graphene-Assembled Films for Wearable Applications

Sensors

Ran Fang¹  Xin Zhao¹  Rongguo Song¹  Wei Qian¹  Zhe Wang¹  Daping He¹ 

[1] Hubei Engineering Research Center of RF-Microwave Technology and Application, Wuhan University of Technology, Wuhan 430070, China;

关键词: graphene-assembled film;    UWB;    CPW;    wearable antenna;   

DOI  :  10.3390/s20092552

来源: DOAJ

【 摘 要 】

In this article, a graphene-assembled film (GAF)-based compact and low-profile ultra-wide bandwidth (UWB) antenna is presented and tested for wearable applications. The highly conductive GAFs (~10⁶ S/m) together with the flexible ceramic substrate ensure the flexibility and robustness of the antenna, which are two main challenges in designing wearable antennas. Two H-shaped slots are introduced on a coplanar-waveguide (CPW) feeding structure to adjust the current distribution and thus improve the antenna bandwidth. The compact GAF antenna with dimensions of 32 $\times$ 52 $\times$ 0.28 mm³ provides an impedance bandwidth of 60% (4.3–8.0 GHz) in simulation. The UWB characteristics are further confirmed by on-body measurements and show a bending insensitive bandwidth of ~67% (4.1–8.0 GHz), with the maximum gain at 7.45 GHz being 3.9 dBi and 4.1 dBi in its flat state and bent state, respectively. Our results suggest that the proposed antenna functions properly in close proximity to a human body and can sustain repetitive bending, which make it well suited for applications in wearable devices.

【 授权许可】

Unknown