5.8-GHz Stacked Differential Rectenna Suitable for Large-Scale Rectenna Arrays With DC Connection

In this communication, a novel stacked differential rectenna is proposed and its characteristics are experimentally investigated. The proposed rectenna can effectively convert RF power to dc due to its differential operation. The conversion efficiency of 44.1% was obtained when the received power density was as low as 0.041 W/m
²
. The proposed rectenna can easily achieve large-scale rectenna arrays effectively using its simple structure. The rectenna array with DC connection provides almost the same conversion efficiency and incident angle characteristics in comparison with a single rectenna.