Design of Dual Band Rectifiers for Energy Harvesting Applications
The wide use of power sensors in both commercial and manufacturing applications have made it crucial to develop wireless solutions for low power devices. One application, which has captured attention in R&D environments, is radio frequency (RF) energy harvesting. In this research, novel RF energy harvesting topology is proposed to harvest ambient power. The harvester can regenerate energy from GSM frequency band 900MHz and 1800MHz to generate steady DC output voltage. The design consists of three-stage voltage doubler circuit and a boost converter. This circuitry is designed to achieve an output voltage of 2.68V in order to charge a Lithium-Ion battery. Especially the efficiency at low power is of concern (-19 to -23 dBm rectifier input). Commercial off-the-shelf components were utilized to design the proposed circuit. The rectifier and a boost converter are simulated in Advanced Design System 2015.01 (ADS) to determine output Characteristics and efficiency. Simulations confirm that a 3-stage rectifier can provide maximum efficiency. The prototype of the circuit was developed in the lab and tested both in the lab and outside environment. Finally, prototype circuit properties are analyzed with simulated circuit design. The final efficiency is 55.32% at input power of -20 dBm.
Eroglu, Purdue University.
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