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学者姓名：高跃明
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Abstract ：
The interactions of medical devices within the body area network (BAN) have significantly alleviated the pressure on healthcare resources attributed to an aging society. However, the low-power, high-reliability wireless communications among these devices are susceptible to the influence of the human body. This paper exploits the capacitive effects of human tissues to achieve precise and reconfigurable impedance matching in magnetic resonance coupling (MRC) human body communication to minimize the adverse effects of the human body. First, the impact mechanism of the human body on MRC port impedance is analyzed in this paper under the inductive near-field based on the dielectric dispersion of human tissues. This mechanism helps identify the quasistatic magnetic field within MRC, from which the resonance conditions of MRC are derived. A reconfigurable impedance matching method within a broad bandwidth is proposed using these conditions, and experiments on port impedance and transmission characteristics are conducted using an optimized variable parameter coil as the implementation medium. Results demonstrate that the proposed method can precisely tune within a range of 10 MHz under inductive near-field, confirming the reliability of the resonance conditions and matching methodology. After matching, the MRC exhibits only 12.5 dB @13.56 MHz path loss over a 90 cm transmission distance, surpassing other methods by more than 52.8%. The optimized MRC provides an effective technical foundation for narrowband communication schemes of medical devices in the BAN. IEEE
Keyword ：
Antennas and propagation Antennas and propagation Coils Coils Couplings Couplings Dispersion Dispersion Human Body Communication (HBC) Human Body Communication (HBC) Impedance Impedance impedance matching impedance matching magnetic quasi-static HBC magnetic quasi-static HBC Magnetic resonance Magnetic resonance magnetic resonance coupling magnetic resonance coupling Monitoring Monitoring reconfigurable method reconfigurable method
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| GB/T 7714 | Wei, Z. , Yang, S. , Chen, Z. et al. A Reconfigurable Impedance Matching Method for Magnetic-Coupling-Based Near-Field Human Body Communication [J]. | IEEE Transactions on Antennas and Propagation , 2024 , 72 (12) : 1-1 . |
| MLA | Wei, Z. et al. "A Reconfigurable Impedance Matching Method for Magnetic-Coupling-Based Near-Field Human Body Communication" . | IEEE Transactions on Antennas and Propagation 72 . 12 (2024) : 1-1 . |
| APA | Wei, Z. , Yang, S. , Chen, Z. , Vai, M.I. , Pun, S.H. , Yang, J. et al. A Reconfigurable Impedance Matching Method for Magnetic-Coupling-Based Near-Field Human Body Communication . | IEEE Transactions on Antennas and Propagation , 2024 , 72 (12) , 1-1 . |
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The development of high-performance optically transparent radio frequency (RF) radiators is limited by the intrinsic loss issue of transparent conductive films (TCFs). Instead of pursuing expensive endeavors to improve the TCFs’ electrical properties, this study introduces an innovative approach that leverages leaky-wave mode manipulation to mitigate the TCFs’ attenuating effect and maximize the RF radiation. Our finding reveals that the precise control of the mode confinement on glass-coated TCFs can create a low-attenuation window for leaky-wave propagation, where the total attenuation caused by TCF dissipation and wave leakage is effectively reduced. The observed low-attenuation leaky-wave state on lossy TCFs originates from the delicate balance between wave leakage and TCF dissipation, attained at a particular glass cladding thickness. By leveraging the substantially extended radiation aperture achieved under suppressed wave attenuation, this study develops an optically transparent antenna with an enhanced endfire realized gain exceeding 15 dBi and a radiation efficiency of 66%, which is validated to offer competitive transmission performance for advancing ubiquitous wireless communication and sensing applications. © 2024 THE AUTHORS
Keyword ：
Antennas Antennas Endfire radiation Endfire radiation Low attenuation Low attenuation Material losses Material losses Transparent conductive films Transparent conductive films
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| GB/T 7714 | Zhou, Z. , Zhang, Y. , Zheng, Y. et al. The Low-Attenuation Endfire Leaky-Wave State on an Optically Transparent Lossy Film [J]. | Engineering , 2024 , 43 : 72-80 . |
| MLA | Zhou, Z. et al. "The Low-Attenuation Endfire Leaky-Wave State on an Optically Transparent Lossy Film" . | Engineering 43 (2024) : 72-80 . |
| APA | Zhou, Z. , Zhang, Y. , Zheng, Y. , Chen, K. , Gao, Y. , Ge, Y. et al. The Low-Attenuation Endfire Leaky-Wave State on an Optically Transparent Lossy Film . | Engineering , 2024 , 43 , 72-80 . |
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Intracardiac wireless communication is crucial for the development of multi-chamber leadless cardiac pacemakers (LCP). However, the time-varying characteristics of intracardiac channel pose major challenges. As such, mastering the dynamic conduction properties of the intracardiac channel and modeling the equivalent time-varying channel are imperative for realizing LCP multi-chamber pacing. In this paper, we present a limiting volume variational approach based on the electrical properties of cardiac tissues and trends in chamber volume variation. This approach was used to establish a quasi-static and a continuous time-varying equivalent circuit model of an intracardiac channel. An equivalence analysis was conducted on the model, and a discrete time-varying equivalent circuit phantom grounded on the cardiac cycle was subsequently established. Moreover, an ex vivo cardiac experimental platform was developed for verification. Results indicate that in the frequency domain, the congruence between phantom and ex vivo experimental outcomes is as high as 94.3%, affirming the reliability of the equivalent circuit model. In the time domain, the correlation is up to 75.3%, corroborating its effectiveness. The proposed time-varying equivalent circuit model exhibits stable and standardized dynamic attributes, serving as a powerful tool for addressing time-varying challenges and simplifying in vivo or ex vivo experiments. IEEE
Keyword ：
Blood Blood Equivalent circuits Equivalent circuits Frequency measurement Frequency measurement Heart Heart Integrated circuit modeling Integrated circuit modeling intracardiac circuit phantom intracardiac circuit phantom intracardiac communication intracardiac communication leadless pacemakers leadless pacemakers Myocardium Myocardium Pacemakers Pacemakers time-varying equivalent model time-varying equivalent model
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| GB/T 7714 | Wei, Z. , Wang, H. , Li, D. et al. A Time-varying Equivalent Circuit Modeling and Measuring Approach for Intracardiac Communication in Leadless Pacemakers [J]. | IEEE Transactions on Biomedical Circuits and Systems , 2024 , 18 (4) : 1-13 . |
| MLA | Wei, Z. et al. "A Time-varying Equivalent Circuit Modeling and Measuring Approach for Intracardiac Communication in Leadless Pacemakers" . | IEEE Transactions on Biomedical Circuits and Systems 18 . 4 (2024) : 1-13 . |
| APA | Wei, Z. , Wang, H. , Li, D. , Vai, M.I. , Pun, S.H. , Yang, J. et al. A Time-varying Equivalent Circuit Modeling and Measuring Approach for Intracardiac Communication in Leadless Pacemakers . | IEEE Transactions on Biomedical Circuits and Systems , 2024 , 18 (4) , 1-13 . |
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Out-To-in (O2I) body wireless communication is crucial for achieving personalized parameter modulation and ensuring reliable cardiac rhythm management in leadless cardiac pacemakers. Compared to traditional radio frequency (RF) wireless communication technology, magnetic resonance coupled human communication (MRC-HBC) technology is a promising method of O2I communication that utilizes human tissue as a conduction medium for electrical signals. In this paper, we present an O2I body communication method that combines low power consumption and high reliability for leadless cardiac pacemakers to enhance the performance of programmed management of leadless cardiac pacemakers (LCPs) and prolong the operating life of the pacemakers. Based on the dielectric properties of human tissues, a transceiver coil was designed for executing O2I body magnetic resonant coupling signal transmission. An O2I body multilayer electromagnetic model for finite element numerical computation was further constructed, and a chest phantom experimental platform was built for mutual verification. The results show that the highest channel gains of simulation and phantom experiment is-35.02 dB @ 13.56 MHz and-27.84 dB @ 13.56 MHz respectively, when the relative distance between the transceiver coils is in the range of 8-12 cm, which represents a significant advantage over the RF wireless communication methods used in previous studies. © 2024 IEEE.
Keyword ：
leadless pacemakers leadless pacemakers magnetic resonant coupling magnetic resonant coupling programmable control programmable control wireless communication wireless communication
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| GB/T 7714 | Yang, S. , Wei, Z. , Chen, L. et al. A Preliminary Exploration of Magnetic Resonance Coupled Human Body Communication in Out-To-In Body Transmission for Leadless Pacemakers [未知]. |
| MLA | Yang, S. et al. "A Preliminary Exploration of Magnetic Resonance Coupled Human Body Communication in Out-To-In Body Transmission for Leadless Pacemakers" [未知]. |
| APA | Yang, S. , Wei, Z. , Chen, L. , Liu, H. , Pun, S.H. , Vai, M.I. et al. A Preliminary Exploration of Magnetic Resonance Coupled Human Body Communication in Out-To-In Body Transmission for Leadless Pacemakers [未知]. |
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Abstract ：
Intracardiac wireless communication is crucial for the development of multi-chamber leadless cardiac pacemakers (LCP). However, the time-varying characteristics of intracardiac channel pose major challenges. As such, mastering the dynamic conduction properties of the intracardiac channel and modeling the equivalent time-varying channel are imperative for realizing LCP multi-chamber pacing. In this article, we present a limiting volume variational approach based on the electrical properties of cardiac tissues and trends in chamber volume variation. This approach was used to establish a quasi-static and a continuous time-varying equivalent circuit model of an intracardiac channel. An equivalence analysis was conducted on the model, and a discrete time-varying equivalent circuit phantom grounded on the cardiac cycle was subsequently established. Moreover, an ex vivo cardiac experimental platform was developed for verification. Results indicate that in the frequency domain, the congruence between phantom and ex vivo experimental outcomes is as high as 94.3%, affirming the reliability of the equivalent circuit model. In the time domain, the correlation is up to 75.3%, corroborating its effectiveness. The proposed time-varying equivalent circuit model exhibits stable and standardized dynamic attributes, serving as a powerful tool for addressing time-varying challenges and simplifying in vivo or ex vivo experiments.
Keyword ：
Blood Blood Equivalent circuits Equivalent circuits Frequency measurement Frequency measurement Heart Heart Integrated circuit modeling Integrated circuit modeling intracardiac circuit phantom intracardiac circuit phantom Intracardiac communication Intracardiac communication leadless pacemakers leadless pacemakers Myocardium Myocardium Pacemakers Pacemakers time-varying equivalent model time-varying equivalent model
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| GB/T 7714 | Wei, Ziliang , Wang, Han , Li, Dongming et al. A Time-Varying Equivalent Circuit Modeling and Measuring Approach for Intracardiac Communication in Leadless Pacemakers [J]. | IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS , 2024 , 18 (4) : 872-884 . |
| MLA | Wei, Ziliang et al. "A Time-Varying Equivalent Circuit Modeling and Measuring Approach for Intracardiac Communication in Leadless Pacemakers" . | IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS 18 . 4 (2024) : 872-884 . |
| APA | Wei, Ziliang , Wang, Han , Li, Dongming , Vai, Mang, I , Pun, Sio Hang , Yang, Jiejie et al. A Time-Varying Equivalent Circuit Modeling and Measuring Approach for Intracardiac Communication in Leadless Pacemakers . | IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS , 2024 , 18 (4) , 872-884 . |
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As an emerging method of intracardiac wireless communication, conductive intracardiac communication (CIC) has the advantages of low power consumption and high security of information transmission, and is suitable for synchronization between multiple leadless pacemakers (LCPs). However, the complicated intracardiac environment increases the measurement uncertainty of intracardiac channel parameters, and current research on intracardiac communication does not take into account impedance mismatch. These may lead to unreliable communication between LCPs. In this paper, an equivalent circuit model of the intracardiac channel is constructed based on the electrical characteristics of cardiac tissue. The intracardiac channel uses an L-type impedance matching circuit to improve the channel gain. The results show that the channel gain increases by more than 7 dB after adding the impedance matching circuit. Especially, the most significant increase is 8.33 dB at 10MHz. This proves the feasibility of the impedance matching method and provides an effective solution for the future design of intracardiac communication transceivers.
Keyword ：
Conductive Intracardiac Conummication(CIC) Conductive Intracardiac Conummication(CIC) impedance matching impedance matching leadless pacemakers (LCPs) leadless pacemakers (LCPs)
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| GB/T 7714 | Wang, Jiamei , Li, Dongming , Wang, Han et al. Research on Impedance Matching for Improving Gain in Conductive Intracardiac Communication [J]. | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 , 2024 : 52-54 . |
| MLA | Wang, Jiamei et al. "Research on Impedance Matching for Improving Gain in Conductive Intracardiac Communication" . | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 (2024) : 52-54 . |
| APA | Wang, Jiamei , Li, Dongming , Wang, Han , Yang, Jiejie , Pun, Sio Tang , Vai, Mang I. et al. Research on Impedance Matching for Improving Gain in Conductive Intracardiac Communication . | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 , 2024 , 52-54 . |
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In clinical treatment, accurate differentiation of pathological symptoms of stroke is crucial for the development of rehabilitation treatment programs. In this study, we proposed a method based on bioimpedance to assess muscle tissue after stroke, and calculated two optimal solutions of muscle impedance circle maps: the center of the muscle impedance circle and the short axis of the muscle impedance by an optimization algorithm, so as to map the muscle impedance circle maps (MICM) of different muscle tissues. The methods were validated by clinical experiments. The results showed that muscle impedance circle mapping can be used to assess the electrical properties of muscle tissue and to differentiate between the two pathologic states of spastic and myasthenic stroke. Therefore, the method proposed in this paper has the potential to assess the rehabilitation status of muscle tissues after stroke, providing new insights for clinical assessment and development of therapeutic regimens.
Keyword ：
bioimpedancemiuscle impedance circle maps bioimpedancemiuscle impedance circle maps stroke stroke
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| GB/T 7714 | Zhou, Junwei , Xu, Pan , Xu, Peitao et al. Muscle Impedance Circle Mapping for Muscle Tissue Assessment after Stroke [J]. | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 , 2024 : 388-390 . |
| MLA | Zhou, Junwei et al. "Muscle Impedance Circle Mapping for Muscle Tissue Assessment after Stroke" . | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 (2024) : 388-390 . |
| APA | Zhou, Junwei , Xu, Pan , Xu, Peitao , Li, Xinyu , Wang, Weihan , Wei, Wei et al. Muscle Impedance Circle Mapping for Muscle Tissue Assessment after Stroke . | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 , 2024 , 388-390 . |
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This paper presents a preliminary exploration of the electromagnetic distribution and electromagnetic compatibility issues related to Magnetic Resonance Human Body Communication (MR- HBC) technology. Through the design of magnetic resonant coils and finite element simulation analysis, the distribution of magnetic field strength and current density within the human body was evaluated. The results indicate that both the magnetic field strength and current density decrease logarithmically as the depth within the body increases (from 10 mm to 150 mm). Notably, high coupling strength remains relatively stable within a depth of 50 mm. Further analysis confirms that the induced currents in MR-HBC are dominated by variations in the magnetic field, exhibiting the volume conductor characteristics of human tissue under specific conditions. MR-HBC technology demonstrates excellent electromagnetic biocompatibility, with current density at operational frequencies well below safety limits, thereby providing a safe foundation and theoretical basis for the application of implanted and wearable medical devices.
Keyword ：
Electromagnetic Compatibility Electromagnetic Compatibility Finite Element Simulation Finite Element Simulation Magnetic Resonance Magnetic Resonance Thiman Body Contimmication Thiman Body Contimmication
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| GB/T 7714 | Jiang, Shaoze , Wang, Hang , Li, Dongming et al. Preliminary Investigation of Electromagnetic Compatibility Analysis for Magnetic Resonance Human Body Communication [J]. | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 , 2024 : 541-543 . |
| MLA | Jiang, Shaoze et al. "Preliminary Investigation of Electromagnetic Compatibility Analysis for Magnetic Resonance Human Body Communication" . | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 (2024) : 541-543 . |
| APA | Jiang, Shaoze , Wang, Hang , Li, Dongming , Wang, Jiamei , Pun, Sio Hang , Vai, Mang I. et al. Preliminary Investigation of Electromagnetic Compatibility Analysis for Magnetic Resonance Human Body Communication . | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 , 2024 , 541-543 . |
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Conductive Intracardiac Communication (CIC) uses cardiac tissue as a transmission medium for short-range wireless communication and is a potential method for enabling leadless multi-chamber pacing. However, the characterization of the intracardiac channel is significantly influenced by the experimental setup and conditions. The reported results in the literature vary depending on the measurement methods used, posing challenges in obtaining reliable channel characterization for CIC. In this paper, we aim to investigate the effects of different measurement devices and conditions on the intracardiac channel. By clarifying how impedance imbalance affects the gain measurement results, we design a weak-signal measurement circuit with high common-mode rejection. This new circuit provides a more accurate and effective gain measurement scheme for the CIC channel. An equivalent circuit model simulating cardiac biomechanical impedance is constructed to analyze how capacitive and resistive imbalances affect the gain measurement results. The effects of these imbalances are verified by intracardiac channel impedance imbalance experiments. A high common-mode rejection-high-resistance differential measurement circuit that can reduce the effects of capacitive and resistive imbalances simultaneously, is then designed to suppress the interference in the experiments. The results show that changes in the measurement equipment and isolation method lead to variations in the coupling circuit characteristics, causing differences of up to 16.65 dB in the measurement results. Experiments using the designed measurement circuits effectively mitigate interference from impedance imbalance on the measurement results. This study identifies the reasons behind the discrepancies in the experimental results of previous studies and provides a more reliable gain measurement scheme for CIC research. © 2024 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.
Keyword ：
Channel Gain Measurement Channel Gain Measurement Conductive Intracardiac Communication Conductive Intracardiac Communication Equivalent Circuit Equivalent Circuit Impedance Imbalance Impedance Imbalance ModelInterference Mitigation ModelInterference Mitigation
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| GB/T 7714 | Wang, H. , Li, D. , Vai, M.I. et al. Analysis and circuit design of imbalanced impedance channels for conductive intracardiac communication [J]. | IEEE Transactions on Biomedical Circuits and Systems , 2024 . |
| MLA | Wang, H. et al. "Analysis and circuit design of imbalanced impedance channels for conductive intracardiac communication" . | IEEE Transactions on Biomedical Circuits and Systems (2024) . |
| APA | Wang, H. , Li, D. , Vai, M.I. , Pun, S.H. , Yang, J. , Li, H.C. et al. Analysis and circuit design of imbalanced impedance channels for conductive intracardiac communication . | IEEE Transactions on Biomedical Circuits and Systems , 2024 . |
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Implantable capacitive intrabody communication is a wireless communication method that utilizes capacitive coupling as a way for the implants to communicate between each other as well as with the devices that are placed on the body. Since there are several possible configurations, such as in-body to on-body (IB2OB) communication and on-body to in-body (OB2IB) communication, it is important to investigate how the communication channel behaves for each configuration. Therefore, in this paper, a two-layer 3D model of the upper part of the leg between the knee and ankle has been created for the measurement purposes. The phantom consists of an outer layer that mimics the fat tissue with a very low conductivity and an inner layer that has a conductivity like the muscle. During the measurements, one pair of electrodes with an insulated ground electrode was inserted into the muscle layer and connected to the transmitter, while the other pair of the electrodes was placed on the phantom and connected to the receiver (IB2OB). After the IB2OB measurements were completed, the transmitter and receiver devices were swapped to measure the OB2IB scenario. The results show that changes in the configuration lead to negligible difference in the measurement results, i.e. the system is reciprocal. Moreover, a high-pass profile was observed for the frequency range from 100 kHz to 84 MHz. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.
Keyword ：
capacitive intrabody communication capacitive intrabody communication implants implants in-body devices in-body devices on-body devices on-body devices transmission measurements transmission measurements
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| GB/T 7714 | Roglić, M. , Klaić, L. , Wei, Z. et al. Comparison of Different Configurations for the Implantable Capacitive Intrabody Communication on a Two-Layer Phantom [未知]. |
| MLA | Roglić, M. et al. "Comparison of Different Configurations for the Implantable Capacitive Intrabody Communication on a Two-Layer Phantom" [未知]. |
| APA | Roglić, M. , Klaić, L. , Wei, Z. , Gao, Y. , Vasić, Ž.L. . Comparison of Different Configurations for the Implantable Capacitive Intrabody Communication on a Two-Layer Phantom [未知]. |
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