Liew Hui Fang, Rosemizi Abd Rahim, Muhammad Izuan Fahmi, Junita Mohd Nordin and Aini Syuhada Md Zain 2023. Review of Active Circuit and Passive Circuit Techniques to Improve the Performance of Highly Efficient Energy Harvesting Systems. Journal of Advanced Research in Applied Sciences and Engineering Technology. 31, 1 (Jul. 2023), 271–290. DOI:https://doi.org/10.37934/araset.31.1.271290.