A 2.45/5.8 GHz high-efficiency dual-band rectifier for low radio frequency input power

Abstract

This article proposes a concurrent rectifier for radio frequency (RF) energy harvesting from the popular ambient RF sources wireless fidelity (WiFi) 2.45 and 5.8 GHz bands. A voltage doubler-based converter circuit with the Schottky SMS7630 diode is used, this chosen diode has shown good results for low power levels. To ameliorate the resulting circuit, we used an interdigital capacitor (IDC) instead of a lumped component; and then we added a filter to reject the 3rd harmonics of each operating frequency. A dual-band impedance transformer with a direct current (DC) block function is used and optimized at low input power points for more harvested DC power. The final circuit was, therefore, more efficient and more reliable. The maximum conversion efficiencies obtained from the resulting circuit are about 60.321% for 2.45 GHz and 47.175% for 5.8 GHz at 2 dBm of input power. Compared to other previous rectifiers presented in the literature, our proposed circuit presents high efficiencies at low power levels and at these operating frequencies.

A Quad-band Low Power High Sensitive RF to DC Converter Circuit for RF Energy Harvesting Applications

“…The proposed work harvests energy at many frequency bands compared to the results that have been published in [18-20, 22-25, 26-28] based on the number of frequency bands that have been used. The authors of [20,22,24,25,27] could get compactness at one and two working frequencies. Yet, this paper suggests a quad-band rectifier that delivers a higher improvement at low input power.…”

“…In RFEH systems, the rectifier/RF-to-DC converter contributes a significant part in the transformation of RF to DC signals. From the concept of operating frequency, rectifiers are divided into four different categories, namely single-band [18][19][20], dual-band [21][22][23], quad-band or multiband [24][25][26], and broadband [27,28]. Numerous rectifier configurations have been studied to evaluate the performance of a rectifier and its conversion efficiency (maximum utilizable power).…”

“…At an input power of 0 dBm, the rectifier achieved a maximum conversion efficiency of 36% and 8%. The authors in [22] proposed a dual-band rectifier based on the impedance transformer. This rectifier gives the conversion efficiency of 44.36% and 26.95% at 2.45 GHz and 5.8 GHz, respectively for −10 dBm input power.…”

“…This rectifier gives the conversion efficiency of 44.36% and 26.95% at 2.45 GHz and 5.8 GHz, respectively for −10 dBm input power. The concepts provided by the researchers in [21][22][23] are adequate for a low-powered RFEH module, but the conversion efficiency is subpar due to the excessive usage of filtering components in the selection of the frequency and diode nonlinearity. The authors proposed a quad-band rectifier using a lumped element-matching network for 0.9, 1.8, 2.1, and 2.4 GHz bands [24].…”

High-efficiency 2.45 and 5.8 GHz dual-band rectifier design with modulated input signals and a wide input power range

“…Hence, more significant loss will occur. That is why it is more used in circuits that operate in 2.45 GHz and 5.8 GHz [27], [28]. The matching unit in our design is based on microstrip lines.…”