Design and optimization of a novel leaf-shape antenna for RF energy transfer

TL;DR

This paper presents a bio-inspired leaf-shaped antenna optimized for RF energy transfer at 915 MHz, demonstrating effective energy capture and powering devices up to 200 cm away.

Contribution

It introduces a novel leaf-shaped antenna design inspired by nature, optimized for RF energy transfer, with experimental validation of its efficiency and potential applications.

Findings

Achieved an S11 parameter of nearly -20 dB at 915 MHz

Successfully powered a device at distances up to 200 cm

Demonstrated improved RF energy transfer efficiency

Abstract

In this research, the design and optimization of a novel leaf-shaped antenna inspired by natural leaf structures for radio frequency energy transfer is presented. The objectives of this study are to develop a bio-inspired antenna, optimize its performance through impedance matching for the 915 MHz frequency band, and evaluate its efficiency in capturing RF energy. The design process involves selecting an appropriate leaf shape, modeling the antenna using AutoCAD and HFSS software, and fabricating a printed circuit board (PCB) prototype. Simulations and physical tests are conducted to optimize the antennas performance, achieving an S11 parameter of nearly -20 dB at 915 MHz, indicating effective energy capture. Experimental results demonstrate the antennas ability to power a device at distances up to 200 cm, with charging times reflecting its efficiency. The study concludes that the bio-inspired design of the proposed antenna improves RF energy transfer. Future work should focus on testing the antennas penetration through concrete and developing a feedback system for autonomous alignment.