Journal
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
Volume 30, Issue 12, Pages 1185-1188Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LMWC.2020.3028607
Keywords
Ambient RF energy harvesting (EH); broadband; high efficiency; parallel resonance; wide dynamic input power
Categories
Funding
- National Natural Science Foundation of China [61731013]
- Fundamental Research Funds for the Central Universities [31920190149]
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In this letter, a compact broadband high-efficiency RF rectifier is presented for ambient RF energy harvesting (EH). A novel impedance matching network with an additional quarter-wavelength short-circuited stub was designed to achieve broadband impedance matching. After the branch was added, the parallel resonance point on track S-11 did not move, and the remaining points were compressed. The measurement results show that the proposed topology could realize a broadband high-efficiency rectifier for ambient RF EH, and the measured results were basically consistent with the simulation results. The measured efficiency is as high as 71.5% for an input power level of 8 dBm. A 1-2.4 GHz wide frequency band with an efficiency above 50% is achieved for an input power level of 5 dBm with a terminal load of 1.6 k Omega. Moreover, the circuit had wide dynamic input power characteristics, whose measured values remained above 50% with an input power of 3-14 dBm.
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