An Efficient Dual-Band Rectifier for GSM/Wi-Fi Bands Operated Microwave Power Transfer Applications

Microwave power transmission (MPT) is a popular technique to provide wake-up power to any low-power devices located at remote locations. A rectenna circuit is therefore needed to capture the RF signal from the surroundings and convert it to electrical DC. This DC power can be utilized to feed the low-power sensors. For efficient performance of rectenna circuits, an efficient rectifier is required. For this purpose, a dual-band rectifier operating at GSM1.8 and WiFi/WLAN2.45 GHz is proposed in this paper. A single diode in series topology and a dual-band matching network have been utilized for RF to DC rectification. The rectifier achieved RF to DC power conversion efficiency (RF-DC PCE) of 61.4% and 54.9% at 1.8, and 2.45 GHz, respectively at 0 dBm. At -30 dBm rectifier has RF-DC PCE of 1.87% and 1.2% at 1.8 and 2.45 GHz respectively. Also, the RF-DC PCE of the rectifier exceeds 50% for the two bands 1.71-1.92 GHz and 2.26-2.52 GHz at 0 dBm.