An RF-Powered FDD Radio for Neural Microimplants

Rajavi, Yashar; Taghivand, Mazhareddin; Aggarwal, Kamal; Ma, Adrian; Poon, Ada S. Y.

doi:10.1109/jssc.2016.2645601

Cited by 35 publications

(12 citation statements)

References 15 publications

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“…instead of the power available from the generator. The maximum PCE F ano achieved by the rectifier at 24 GHz is 14% at 12.7 dBm, with a net DC output of 0.5 mW, sufficient for low-power nodes and transceivers in [16]- [18].…”

Section: Rectifier Simulation and Measurementmentioning

confidence: 99%

“…Although most low power mmWave rectennas are only able to yield a net DC power of less than 10 mW, the justification for development of mmWave rectennas despite their lower efficiency compared to Ultra-high Frequency (UHF) bands lies in their compactness [6]. Moreover, mmWave transceivers have been reported with as low as 7.2-µW active receiver power consumption [16], in addition to nW-sleep power for Bluetooth Low Energy transceiver [17]. Furthermore, a low data rate 60 GHz transceiver has been reported with a 4.9 pJ/bit energy consumption at 60 GHz [18].…”

mentioning

confidence: 99%

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Broadband Millimeter-Wave Textile-Based Flexible Rectenna for Wearable Energy Harvesting

Wagih

Hilton

Weddell

et al. 2020

IEEE Trans. Microwave Theory Techn.

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Millimeter-Wave (mmWave) bands, a key part of future 5G networks, represent a potential channel for RF energy harvesting, where the high-gain antenna arrays offer improved end-to-end efficiency compared to sub-6 GHz networks. This paper presents a broadband mmWave rectenna, the first rectenna realized on a flexible textile substrate for wearable applications. The proposed novel antenna's bandwidth extends from 23 to 40 GHz, with a minimum radiation efficiency of 67% up to 30 GHz, over 3 dB improvement compared to a standard patch. A stable gain of more than 8 dB is achieved based on a textile reflector plane. The antenna is directly connected to a textilebased microstrip voltage doubler rectifier utilizing commercial Schottky diodes. The rectifier is matched to the antenna using a tapered line feed for high-impedance matching, achieving broadband high voltage-sensitivity. The rectifier has a peak RF-DC efficiency of 12% and a 9.5 dBm 1 V sensitivity from 23 to 24.25 GHz. The integrated rectenna is demonstrated with more than 1.3-V DC output from 12 dBm of mmWave wireless power across a 28% fractional bandwidth from 20 to 26.5 GHz, a 15% half-power fractional bandwidth, and a peak output of 6.5V from 20 dBm at 24 GHz.

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Section: Rectifier Simulation and Measurementmentioning

confidence: 99%

mentioning

confidence: 99%

Broadband Millimeter-Wave Textile-Based Flexible Rectenna for Wearable Energy Harvesting

Wagih

Hilton

Weddell

et al. 2020

IEEE Trans. Microwave Theory Techn.

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“…In order to tackle these challenges, researchers have come up with powerifng biomedical devices wirelessly instead of batteries, but reliable power transfer via tissue body is required [1]. There are different types of source such as solar, vibration, thermoelectric, Radio-Frequency (RF), and so on [2]. Some qualities should be considered in order to pick an appropriate source.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, one of the most important factors, which increases interest in RF harvesting [3], is to be affordable by ordinary customers. Furthermore, electromagnetic sources for implants are preferred because of its reliability and easy integration with electronics [2]. In addition, although inherent energy sources in the body, such as heat, motion, or glucose [4] can be used, they are anatomically specific and produce low power densities in their existing forms.…”

Section: Introductionmentioning

confidence: 99%

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A Miniaturized UHF-Band Rectenna for Power Transmission to Deep-Body Implantable Devices

Abdi

Aliakbarian

2019

IEEE J. Transl. Eng. Health Med.

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This paper presents the design, simulation, and fabrication of a 50 Ohm miniaturized rectenna for wireless energy harvesting for leadless pacemakers. The paper evaluates the performance of each section separately and also while cascaded. The system is designed to work at ultra-low RF input power. When the rectenna is placed 5 cm away from the body surface in simulations, the amount of received power is approximately −20 dBm. The proposed antenna is a miniature spiral PIFA with circular polarization at 673 MHz. The measured results, in and outside sheep’s fat tissue, show that about 15 MHz bandwidth can be realized with \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{upgreek} \usepackage{mathrsfs} \setlength{\oddsidemargin}{-69pt} \begin{document} }{}$\vert S 11\vert $ \end{document} below −10 dB and an axial ratio below 3 dB. Two types of rectifiers are fabricated and compared to choose the best one for such a system. Then, unlike most other researches which selected the doubler rectifier structure, this paper uses a single-diode rectifier structure at this power level. The rectenna can be encapsulated in a cylinder with a radius of 5 mm and a height of 3.2 mm. The efficiency of the rectenna reaches 40% at −20 dBm input power.

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Wireless Power Transfer and Telemetry for Implantable Bioelectronics

Yoo

Lee

Joo

et al. 2021

Adv Healthcare Materials

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Implantable bioelectronic devices are becoming useful and prospective solutions for various diseases owing to their ability to monitor or manipulate body functions. However, conventional implantable devices (e.g., pacemaker and neurostimulator) are still bulky and rigid, which is mostly due to the energy storage component. In addition to mechanical mismatch between the bulky and rigid implantable device and the soft human tissue, another significant drawback is that the entire device should be surgically replaced once the initially stored energy is exhausted. Besides, retrieving physiological information across a closed epidermis is a tricky procedure. However, wireless interfaces for power and data transfer utilizing radio frequency (RF) microwave offer a promising solution for resolving such issues. While the RF interfacing devices for power and data transfer are extensively investigated and developed using conventional electronics, their application to implantable bioelectronics is still a challenge owing to the constraints and requirements of in vivo environments, such as mechanical softness, small module size, tissue attenuation, and biocompatibility. This work elucidates the recent advances in RF‐based power transfer and telemetry for implantable bioelectronics to tackle such challenges.

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An RF-Powered FDD Radio for Neural Microimplants

Cited by 35 publications

References 15 publications

Broadband Millimeter-Wave Textile-Based Flexible Rectenna for Wearable Energy Harvesting

Broadband Millimeter-Wave Textile-Based Flexible Rectenna for Wearable Energy Harvesting

A Miniaturized UHF-Band Rectenna for Power Transmission to Deep-Body Implantable Devices

Wireless Power Transfer and Telemetry for Implantable Bioelectronics

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