Abstract
In this paper, a compact rectifier, capable of harvesting ambient radio frequency (RF) power is proposed. The total size of the rectifier is 45.4 mm × 7.8 mm × 1.6 mm, designed on FR-4 substrate using a single-stage voltage multiplier at 900 MHz. GSM/900 is among the favorable RF Energy Harvesting (RFEH) energy sources that span over a wide range with minimal path loss and high input power. The proposed RFEH rectifier achieves measured and simulated RF-to-dc (RF to direct current) power conversion efficiency (PCE) of 43.6% and 44.3% for 0 dBm input power, respectively. Additionally, the rectifier attained 3.1 V DC output voltage across 2 kΩ load terminal for 14 dBm and is capable of sensing low input power at −20 dBm. The work presents a compact rectifier to harvest RF energy at 900 MHz, making it a good candidate for low powered wireless communication systems as compares to the other state of the art rectifier.
Highlights
The ubiquitous nature of wireless communication technology has over the years attract and gained much attention and contribution from researchers globally [1,2]
This research targets an energy harvesting rectifier that works over GSM/900 to cover long and remote places suitable for low powered IoT devices and sensor nodes
The voltage appears at the end of an RF Energy Harvesting (RFEH) antenna is considerably of small quantity and as well analogous to sinusoidal signal.A conditioning circuit across the load terminal is an important figure to improve the output DC signals of the RFEH module
Summary
The ubiquitous nature of wireless communication technology has over the years attract and gained much attention and contribution from researchers globally [1,2]. An RF rectifier is proposed in [15], the design can achieve up to 33% efficiency at −10 dBm input power at the cost of complex circuit with large electrical length. A rectenna that achieved up to 24% PCE is proposed in [14], using −20 dBm input power with help of an antenna array and rectifier with a total geometry of 32.4 cm. The designed is a good candidate for harvesting RF energy in ambient environment with capability of sensing RF input power below −20 dBm integrable with low powered IoT devices. To the best of our knowledge, this is the compact RFEH rectifier as compares to state of the art rectifiers at 900 MHz. This research targets an energy harvesting rectifier that works over GSM/900 to cover long and remote places suitable for low powered IoT devices and sensor nodes. The proposed design can receive an RF input signal at less than −20 dBm and provides detailed circuit and performance analysis
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