A Circularly Polarized Implantable Rectenna for Microwave Wireless Power Transfer

Xu, Chao; Fan, Yi; Liu, Xiongying

doi:10.3390/mi13010121

Open AccessArticle

A Circularly Polarized Implantable Rectenna for Microwave Wireless Power Transfer

by

Chao Xu

^1,2,

Yi Fan

³ and

Xiongying Liu

^1,2,*

¹

School of Electronic and Information Engineering, South China University of Technology, Guangzhou 510640, China

²

National Engineering Technology Research Center for Mobile Ultrasonic Detection, Guangzhou 510640, China

³

School of Electronic and Information, Guangdong Polytechnic Normal University, Guangzhou 510665, China

^*

Author to whom correspondence should be addressed.

Micromachines 2022, 13(1), 121; https://doi.org/10.3390/mi13010121

Submission received: 12 December 2021 / Revised: 9 January 2022 / Accepted: 10 January 2022 / Published: 12 January 2022

(This article belongs to the Special Issue Smart Implants)

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Abstract

A circularly polarized implantable antenna integrated with a voltage-doubled rectifier (abbr., rectenna) is investigated for microwave wireless power transfer in the industrial, scientific, and medical (ISM) band of 2.4–2.48 GHz. The proposed antenna is miniaturized with the dimensions of 7.5 mm × 7.5 mm × 1.27 mm by etching four C-shaped open slots on the patch. A rectangular slot truncated diagonally is cut to improve the circular polarization performance of the antenna. The simulated impedance bandwidth in a three-layer phantom is 30.4% (1.9–2.58 GHz) with |S₁₁| below −10 dB, and the 3-dB axial-ratio bandwidth is 16.9% (2.17–2.57 GHz). Furthermore, a voltage-doubled rectifier circuit that converts RF power to DC power is designed on the back of the antenna. The simulated RF-to-DC conversion efficiency can be up to 45% at the input power of 0 dBm. The proposed rectenna was fabricated and measured in fresh pork to verify the simulated results and evaluate the performance of wireless power transfer.

Keywords: circular polarization; implantable antenna; rectenna; rectifier; RF energy harvesting; wide band; wireless power transfer

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MDPI and ACS Style

Xu, C.; Fan, Y.; Liu, X. A Circularly Polarized Implantable Rectenna for Microwave Wireless Power Transfer. Micromachines 2022, 13, 121. https://doi.org/10.3390/mi13010121

AMA Style

Xu C, Fan Y, Liu X. A Circularly Polarized Implantable Rectenna for Microwave Wireless Power Transfer. Micromachines. 2022; 13(1):121. https://doi.org/10.3390/mi13010121

Chicago/Turabian Style

Xu, Chao, Yi Fan, and Xiongying Liu. 2022. "A Circularly Polarized Implantable Rectenna for Microwave Wireless Power Transfer" Micromachines 13, no. 1: 121. https://doi.org/10.3390/mi13010121

APA Style

Xu, C., Fan, Y., & Liu, X. (2022). A Circularly Polarized Implantable Rectenna for Microwave Wireless Power Transfer. Micromachines, 13(1), 121. https://doi.org/10.3390/mi13010121

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A Circularly Polarized Implantable Rectenna for Microwave Wireless Power Transfer

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