Differential Mode Rectenna Array

This paper reports “Differential Mode Rectenna Array” for the wireless microwave power transmission. A novel differential mode rectenna unit which has antenna array integrated with a rectifying circuit and feed circuit is proposed. Two differential mode rectenna units are partly overlapped in the rectenna array. The advantages of this differential mode rectenna unit are the excellent design flexibility and size extensibility. If they are connected in series/parallel, higher voltage/more current can be easily obtained. The design frequency is 5.8 GHz in ISM band. In the measurement, the maximum RF-DC conversion efficiency of 47 % is achieved when the load resistance is 220 Ω at the RF power density of 0.021 W/m².