A Wide-Angle Rectifier Based on Quadrature Coupler

In this paper, a rectifier with wide-incident-angle (WIA) property is proposed. It is composed of a quadrature coupler, two identical sub-rectifiers (Rect
A
and Rect
B
) and a direct current (DC) power combining circuit (DC-PCC). In this design, Rect
A
and Rect
B
are connected to the two output ports (P
3
and P
4
), respectively. In addition, two RF sources (RF
1
and RF
2
) are connected the other two ports (P
1
and P
2
). Here, RF
1
and RF
2
have an identical input power level and a phase difference (Δφ). The DC output of the two sub-rectifiers are combined by the DC-PCC. Then, the DC power is transmitted to the load (R
L
). To validate the proposed approach, we developed a WIA rectifier working at 2.45 GHz. The measurement results show that the maximum efficiency is 73.4 %. When the phase difference varies in the range of 0°-360°, the efficiency has a 8.7 % efficiency variation range (64.7 %~73.4 %). Thus, the proposed WIA rectifier design approach is validated.