设计了一种倒L形枝节加载宽带圆极化缝隙天线。天线为单层矩形结构,采用共面波导（CPW）馈电,通过在馈线上端加载倒L形枝节和在环形接地面上加载T形枝节,实现了天线的宽阻抗带宽和宽轴比带宽特性。实测结果表明,S11≤-10 d B的阻抗带宽...设计了一种倒L形枝节加载宽带圆极化缝隙天线。天线为单层矩形结构,采用共面波导（CPW）馈电,通过在馈线上端加载倒L形枝节和在环形接地面上加载T形枝节,实现了天线的宽阻抗带宽和宽轴比带宽特性。实测结果表明,S11≤-10 d B的阻抗带宽达到115%（1.6～5.9 GHz）,轴比≤3 d B的圆极化带宽为48.3%（2.2～3.6GHz）。该天线结构简单、易于制作,具有较好的应用前景。展开更多
This paper presents an experimental study of the broadband energy harvesting and dynamic responses of an L-shaped piezoelectric cantilever beam.Experimental results show that the L-shaped piezoelectric beam generates ...This paper presents an experimental study of the broadband energy harvesting and dynamic responses of an L-shaped piezoelectric cantilever beam.Experimental results show that the L-shaped piezoelectric beam generates two optimal voltage peaks when the horizontal beam size is similar to the vertical beam size.Several optimized L-shaped piezoelectric cantilever beam structures are proposed.Power generation using the inverted bistable L-shaped beam is better.It is observed experimentally that the inverted bistable L-shaped beam structure shows obvious bistable characteristics and hard spring characteristics.Furthermore,the corresponding relationship between the bistable phase portrait and the potential energy curve is found in the experiment.This is the first time that a phase portrait for stiffness hardening of an L-shaped beam has been found experimentally.These results can be applied to analysis of new piezoelectric power generation structures.展开更多
文摘设计了一种倒L形枝节加载宽带圆极化缝隙天线。天线为单层矩形结构,采用共面波导（CPW）馈电,通过在馈线上端加载倒L形枝节和在环形接地面上加载T形枝节,实现了天线的宽阻抗带宽和宽轴比带宽特性。实测结果表明,S11≤-10 d B的阻抗带宽达到115%（1.6～5.9 GHz）,轴比≤3 d B的圆极化带宽为48.3%（2.2～3.6GHz）。该天线结构简单、易于制作,具有较好的应用前景。
基金supported by the National Natural Science Foundation of China(Grants 11772008,11172009,11372015,11232009,10872010,11290152,10732020)the Tianjin Natural Science Foundation(Grant 19JCZDJC32300).
文摘This paper presents an experimental study of the broadband energy harvesting and dynamic responses of an L-shaped piezoelectric cantilever beam.Experimental results show that the L-shaped piezoelectric beam generates two optimal voltage peaks when the horizontal beam size is similar to the vertical beam size.Several optimized L-shaped piezoelectric cantilever beam structures are proposed.Power generation using the inverted bistable L-shaped beam is better.It is observed experimentally that the inverted bistable L-shaped beam structure shows obvious bistable characteristics and hard spring characteristics.Furthermore,the corresponding relationship between the bistable phase portrait and the potential energy curve is found in the experiment.This is the first time that a phase portrait for stiffness hardening of an L-shaped beam has been found experimentally.These results can be applied to analysis of new piezoelectric power generation structures.
