Abstract
In this work, a Radio Frequency (RF) Energy Harvester comprised of a differential Radio Frequency-to-Direct Current (RF-DC) converter realized in ST130 nm Complementary Metal-Oxide-Semiconductor (CMOS) technology and a customized broadband Printed Circuit Board (PCB) antenna with inductive coupling feeding is presented. Experimental results show that the system can work with different carrier frequencies and thanks to its reconfigurable architecture the proposed converter is able to provide a regulated output voltage of 2 V over a 14 dB of RF input power range. The conversion efficiency of the whole system peaks at 18% under normal outdoor working conditions.
Highlights
Energy harvesting has become an attractive way to power wirelessly connected electronic systems such as sensors without using batteries or other energy source with limited lifetime
We focused on the characterization of the whole system, in order to present some considerations and guidelines which can be used in the design of completely new Radio Frequency (RF) energy harvesting systems
We have presented a RF energy harvester comprised of a Radio Frequency-to-Direct Current (RF-DC) converter realized in
Summary
Energy harvesting has become an attractive way to power wirelessly connected electronic systems such as sensors without using batteries or other energy source with limited lifetime. Extending the frequency band of operations is highly desirable, as well as devising circuit solutions compensating the frequency shifts due to the unpredictable parasitic effects arising from the connection of the antenna to the converter IC In this respect, the broadband co-design of the antenna and the IC converter is a key step to improve the efficiency and sensitivity performances of the whole system. The system architecture has to be chosen as a trade-off between opposite requirements of the single functional blocks, and combining the best solutions of each stand-alone component could not lead to the best performances of the whole system For these reasons, we focused on the characterization of the whole system, in order to present some considerations and guidelines which can be used in the design of completely new RF energy harvesting systems.
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