NOVEL HEXAGONAL MULTIBAND MICROSTRIP ANTENNA DESIGN FOR ENERGY HARVESTING SYSTEMS IN IOT APPLICATIONS

Date

2024-9

Author

Mubaiwa, Amanda Tanyaradzwa

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The important factors to consider when designing an antenna for energy harvesting in the ambient are antenna radiation, rectifier conversion efficiency antenna size and rectenna. This thesis presents a multiband hexagonal microstrip antenna and rectifier that are combined to optimize the RF capture and RF-to-DC conversion. The microstrip antenna fabricated on an FR4 substrate, is built to harvest energy from GSM-1800, and the 2.4 GHz Wi-Fi bands. The slot on the patch and a slotted feedline technique are used for better impedance matching and impedance bandwidth enhancement of the microstrip antenna with a peak gain of 1.1 dB and 1.47 dB at 1.8 GHz and 2.4 GHz respectively. Two single-stage voltage doubler rectifiers are proposed, one operating at 1.8 GHz and another at 2.4 GHz. They are designed in ADS and fabricated on FR4 substrate. An impedance matching network is implemented on the rectifier to improve the RF- to DC conversion efficiency reaching above 60% at 10 dBm input power for both frequency bands. These results from the proposed rectenna demonstrate that the RF energy harvesting system can be used to power-up low power IoT sensor platforms.

Subject Keywords

RF energy harvesting, Slot, Multiband, Rectenna, Matching network

URI

https://hdl.handle.net/11511/111608

Collections

Northern Cyprus Campus, Thesis