Article
Engineering, Electrical & Electronic
Izaz Ali Shah, Muhammad Zada, Syed Ahson Ali Shah, Abdul Basir, Hyoungsuk Yoo
Summary: This article presents a highly efficient near-field wireless power transfer system for miniaturized implantable medical devices. The system achieves simultaneous wireless power reception and data telemetry using a flexible metasurface slab and an in-body receiver. Experimental results demonstrate a significant improvement in power transmission efficiency in various scenarios.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Automation & Control Systems
Conghui Lu, Xiutao Huang, Cancan Rong, Xiong Tao, Yingqin Zeng, Minghai Liu
Summary: This article introduces a novel asymmetric wireless power transfer system by integrating with two kinds of dual-band metamaterials, suitable for recharging portable electronic devices. Simulation and experimentation verify the efficiency enhancement of the system using dual-band negative permeability metamaterial.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Taiki Takamatsu, Yin Sijie, Takeo Miyake
Summary: Wireless biosensors are crucial for the digital transformation of healthcare. In this study, a parity-time (PT) symmetric wireless biosensor is proposed, which can effectively detect small biological signals such as tear glucose and blood lactate levels. The system exhibits high sensitivity and tunability, making it suitable for wearable or implantable devices to monitor small biological signals.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Analytical
Hyeonkeon Lee, Jongheon Lee, Honghyeon Park, Mi Song Nam, Yun Jung Heo, Sanghoek Kim
Summary: The study presents a mm sized wireless biomedical sensor system using backscattered frequency-modulation communication for low-power operation and glucose level reading from a fluorescent hydrogel sensor. The optimized reader structure enables efficient wireless power transfer and data communication, miniaturizing the implantable device to a size of 3 x 6 mm2. The wireless interface is envisioned to be applicable to other fluorescence-based biosensors for comfortable, biocompatible, and stable use within the body.
Article
Chemistry, Multidisciplinary
Semin Jo, Wonwoo Lee, Hojin Lee
Summary: Wireless power transfer (WPT) systems enable long-term operation and miniaturization of implantable devices by eliminating the need for battery replacement and wired power supplies. However, the practical application of wireless power transfer systems for implantable devices is challenging due to constraints and requirements of the human body, such as tissue reflection loss, small device size, and electromagnetic wave attenuation.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Alya Ali Musaed, Samir Salem Al-Bawri, Mohammad Tariqul Islam, Ahmed Jamal Abdullah Al-Gburi, Mandeep Jit Singh
Summary: This paper introduces a unique and miniaturized metamaterial unit for 6G applications, which has tunability performance and dual resonances. The proposed design exhibits various functionalities and characteristics within a specific frequency range.
Article
Engineering, Electrical & Electronic
Zhe-Jia He, Lianwen Deng, Pin Zhang, Yawen Liu, Tianyi Yan, Congwei Liao, Shengxiang Huang, Lei-Lei Qiu, Lei Zhu
Summary: In this paper, a wideband rectifying metasurface (RMS) for RF energy harvesting (EH) is proposed. The RMS utilizes the resonant modes of the paralleling metasurface (MS) resonator to achieve wideband feature and direct impedance matching, eliminating the need for impedance matching. A dc feed structure is also introduced to combine and export dc energy directly, eliminating power combining networks. Experimental results show that the proposed RMS system operates at a frequency range of 5.32-6.66 GHz with a fractional bandwidth of 22.4% and a peak efficiency of 74.5%. This work contributes to capturing RF energy on a broader frequency range with higher system efficiency and a simple structure, showing great potential in wireless power transfer and indoor RF EH.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Biomedical
Jiajie Chen, Jin Xu
Summary: This study aims to improve the transmission efficiency of implantable cardiac pacemakers by designing a new coil structure and finding the optimal radius ratio between transmitting and receiving coils. Simulations using Mathcad and Maxwell were conducted to analyze the influence of radius ratio on transmission efficiency and mutual inductance. Experimental verification showed that the new coil structure proposed in this paper effectively enhances the transmission efficiency of the cardiac pacemaker.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2021)
Article
Engineering, Electrical & Electronic
Francesca Benassi, Giacomo Paolini, Diego Masotti, Alessandra Costanzo
Summary: This research presents a wearable antenna design that can be wirelessly powered and detects the presence of ethanol solutions using a resonant stub. The system, implemented on a flexible substrate, utilizes various techniques for fluid detection and wireless power transfer.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Automation & Control Systems
Jiaqi Han, Long Li, Xiangjin Ma, Xiaohe Gao, Yajie Mu, Guisheng Liao, Zhang Jie Luo, Tie Jun Cui
Summary: An adaptively smart wireless power transfer system using a 2-bit programmable metasurface is proposed. The system utilizes near-field focused technique and digital phase-shift quantization to achieve dynamic wireless powers transmission. Experimental results show that the proposed system is capable of continuously transmitting wireless powers to a moving target with high efficiency.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Xiaonan Wu, Fuyao Hou, Yicen Li, Shihao Zhao, Song Zhang, Hao Xue, Mingyang Chang, Jiaqi Han, Haixia Liu, Long Li
Summary: This article investigates and analyzes the multitarget wireless power transfer (WPT) system based on metasurface-holography multifocal beams and the design methods to address the critical problem of WPT for the growing number of wireless devices. A new field calculation formula is derived based on the Friis formula to break the limitation of paraxial approximation and make metasurface holography applicable in wide-angle, long-distance, and nonplane space. The simultaneous amplitude-phase optimization of the metasurface improves transmission efficiency. The proposed method demonstrates a feasible high-efficiency and long-distance WPT strategy for multiple targets in wide-angle and spatial scenarios.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Engineering, Electrical & Electronic
Long Li, Pei Zhang, Fangjie Cheng, Mingyang Chang, Tie Jun Cui
Summary: A novel optically transparent reflection-type metasurface based on indium tin oxide (ITO) material is proposed in this study, which achieves high transmission of visible light and near-field focusing of microwave, demonstrating potential for wireless power transfer and harvesting applications. By overcoming the main challenge in designing metasurface with lossy metal materials, the study successfully designs two types of metasurfaces for different deployment scenarios.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Chemistry, Analytical
Woosol Lee, Yong-Kyu Yoon
Summary: This work presents a high-efficiency reconfigurable wireless-power-transfer (WPT) system using fully rollable Tx/Rx coils and a metasurface (MS) screen working at 6.78 MHz, for the first time. The MS screens are placed between the Tx and Rx to magnify the power-transfer efficiency (PTE) of the WPT system. The proposed MS-based WPT can be rolled down or rolled up as required, which allows end-users to use the space more flexibly. The measurement results show that the PTE of the WPT is significantly improved with the use of MS screens, even in misalignment conditions.
Article
Engineering, Electrical & Electronic
Xianbo Cao, Hiroyasu Sato, Kai-Da Xu, Wen Jiang, Shuxi Gong, Qiang Chen
Summary: Wireless power transfer technology has played a crucial role in the development of biomedical devices. A systematic method to improve the efficiency of wireless power transfer is proposed, which includes the application of a Fresnel zone plate and an air layer-artificial matching layer to reduce propagation loss and interface reflection. Simulation and experimental results demonstrate that the proposed method significantly enhances the efficiency of wireless power transfer.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Youngdae Cho, Abdul Basir, Young-Hyo Lim, Hyoungsuk Yoo
Summary: Midfield wireless power transfer is an efficient method for wirelessly transmitting power to compact implanted devices. However, the current technology is not optimized for the diverse characteristics of the real human body. Through simulation and experimental measurements, it was found that the optimal frequency is influenced by the tissue composition and thickness.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
