基于压电材料的双频段混合能量收集天线

Dual-band hybrid energy harvesting antenna based on piezoelectric material

摘要:

针对环境混合能量收集(天线)的小型化设计目标，设计一种基于聚偏氟乙烯(PVDF)压电材料的双频段共面波导(CPW)天线。天线的主要辐射单元为矩形铜皮贴纸，两侧对称的L型铜皮贴纸形成共面波导馈电结构，并作为微扰单元改变天线的表面电流分布，实现双频的设计要求。天线设计并制造在PVDF压电薄膜上，由于压电材料本身所具备的压电特性和高介电常数，该天线可同时收集射频与振动2种能量，天线尺寸得到有效减小。实验结果表明：该天线可同时工作在2.4 GHz和5.8 GHz的常用工业、科学与医学(ISM)频段，峰值增益分别为0.77 dB和2.47 dB。

Abstract:

Aiming at the miniaturization design goal of environmental hybrid energy harvesting, a dual-band Coplanar Waveguide(CPW) antenna based on Polyvinylidene Fluoride(PVDF) piezoelectric material is proposed. The main radiation element of the antenna is a rectangular copper sticker. The symmetric L-shaped copper stickers on both sides form a coplanar waveguide feeding structure, which works as a perturbation unit to change the surface current distribution of the antenna, and achieve the dual-band design requirement. The antenna is designed and fabricated on the PVDF piezoelectric film. Due to the piezoelectric properties and high dielectric constant of the piezoelectric material itself, the antenna can simultaneously harvest both Radio Frequency(RF) and vibration energies and the size of the antenna can be effectively reduced. The experimental results show that the antenna can work in the common Industrial Scientific Medical(ISM) band of 2.4 GHz and 5.8 GHz at the same time, and the peak gains are 0.77 dB and 2.47 dB, respectively.