Design and performance verification of RF energy harvester based on electromagnetic metamaterial
A metamaterial energy harvester for 2.45 GHz radio frequency(RF)energy harvesting is designed.It consists of a typical sandwich structure with a resonant structure of complementary split resonant ring(CSRR)and the middle dielectric layer is made up of F4B material with low loss angle tangent performance.The perfect absorption of electromagnetic(EM)energy in the WiFi band is achieved by punching holes at the split of the CSRR and loading the load resistor.Then,the absorption mechanism of the metamaterial energy harvester is analyzed from different aspects by simulating the input impedance and multiphysics field distribution.The measurement results of the prototype show that the designed metamaterial energy harvester is able to achieve an energy harvesting efficiency of 89.3％at 2.5 GHz.It validates the feasibility of the designed metamaterial resonant structure for energy harvesting in the WiFi band,which can be used as a primary or power-assisted source for low-power consumer electronics,medical implantable devices,IoT sensor nodes,and so on.
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维普
