A flexible antenna for portable and wearable radio frequency energy harvesting and flexible electronics applications is proposed. A silicone wristband with ɛ_r = 3 is used as the substrate to support the radiating element and hence the appellation given as bandenna – a wristband antenna. The radiating element is a single fed corner truncated circularly polarized microstrip patch operating in the 2.45 GHz ISM band. The measured results show that for VSWR bandwidth is 100 MHz from 2.4 to 2.5 GHz. The proposed bandenna is right handed circularly polarized with 3 dB axial ratio bandwidth of 25 MHz. It has a directional radiation with stable gain of greater than 5 dBi over the VSWR bandwidth. The proposed bandenna is cost effective as it exploits commercially available silicone and ensures reduced SAR due to the large ground plane backing the radiator. The bandenna in combination with a rectification unit can be worn as wristbands to serve as ambient radio frequency energy harvester. The proposed bandenna being flexible can support wireless communication when integrated into future flexible electronic devices.

提出了一种用于便携式和可穿戴射频能量收集的柔性天线以及柔性电子应用。有机硅腕带与ɛ _[R = 3用作支撑辐射元件的基板，因此命名为bandenna –腕带天线。辐射元件是工作于2.45 GHz ISM频段的单馈电角截短的圆极化微带贴片。测量结果表明，对于VSWR，带宽为2.4至2.5 GHz，为100 MHz。拟议的天线是右旋圆极化的，轴向比率为3 dB，带宽为25 MHz。它具有定向辐射，在VSWR带宽上具有大于5 dBi的稳定增益。拟议的带状天线具有成本效益，因为它利用了市售的有机硅，并且由于背对辐射器的接地平面较大，可确保降低SAR。带整流单元的带状天线可以配戴成腕带，用作环境射频能量采集器。