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Multi-Band RF Energy Harvesting System Using Buck-Boost DC-DC Converter  

Cho, Choon Sik (한국항공대학교 항공전자정보공학부 고주파회로연구실)
Publication Information
Journal of Satellite, Information and Communications / v.12, no.2, 2017 , pp. 89-93 More about this Journal
Abstract
This paper introduces an energy harvesting system that generates energy by collecting multi-band RF signals using buck-boost DC-DC converter. In an environment where the resistance of load using the collected electric energy is constantly changing, a buck-boost DC-DC converter is used in which the input resistance of the DC-DC converter does not change even if the load resistance changes. Since the frequency band of the input RF signal varies, the rectifier is designed for each band so that multiple bands can be processed, and a matching circuit is added to each band in front of the rectifier. For a rectifier to collect very small RF signals, a circuit is designed so that a constant voltage is obtained according to a very small input signal by devising a method of continuously accumulating the voltages collected and generated in each band. It is confirmed that the output efficiency can reach up to 20% even for the RF signal having the input of -20 dBm.
Keywords
RF harvesting; rectifier; multi-band; DC-DC converter; buck-boost converter;
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