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学者姓名：许志猛
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Abstract ：
The time reversal method has been shown to be capable of reconstructing electromagnetic sources. However, in the past, most sources reconstructed are point sources that may not be often seen in practical situations. This paper presents preliminary studies on the time-reversal reconstruction of the sources with arbitrary geometrical shapes and with finite frequency bandwidths. Our results show that the time-reversal method, incorporating the Kurtosis, can effectively find the locations, excitation, and band-limited arbitrarily shaped sources. In addition, in an ergodic cavity, a single sensor is adequate to reconstruct the sources with reduced operational cost and complexity.This paper lays the groundwork for further development of the TR method for its uses in realistic scenarios of source reconstructions.
Keyword ：
finite-difference time-domain (FDTD) method finite-difference time-domain (FDTD) method Kurtosis Kurtosis source reconstruction source reconstruction time-reversal(TR) time-reversal(TR)
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| GB/T 7714 | Li, Juan , Chen, Zhizhang David , Feng, Xiaoyao et al. Reconstruction of Arbitrarily Shaped Sources with Electromagnetic Time-Reversal and Kurtosis [J]. | MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM, IMS 2024 , 2024 : 824-826 . |
| MLA | Li, Juan et al. "Reconstruction of Arbitrarily Shaped Sources with Electromagnetic Time-Reversal and Kurtosis" . | MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM, IMS 2024 (2024) : 824-826 . |
| APA | Li, Juan , Chen, Zhizhang David , Feng, Xiaoyao , Cai, Jun , Xu, Zhimeng . Reconstruction of Arbitrarily Shaped Sources with Electromagnetic Time-Reversal and Kurtosis . | MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM, IMS 2024 , 2024 , 824-826 . |
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拓扑优化方法因其高自由度特点在器件智能设计领域发挥重要作用,在微波工程课程中引入器件拓扑优化实验可提升课程前沿性.该实验通过天线匹配网络拓扑优化提高天线的辐射性能:首先采用阻抗矩阵方法对天线匹配网络的响应进行理论建模,随后利用遗传算法对网络进行拓扑优化,实现天线工作频带的智能按需设计.结果表明,经过拓扑优化的微波天线可在指定的频带内实现良好的阻抗匹配,达到95％以上的最大天线效率.该实验展示了基于阻抗矩阵理论的微波网络拓扑优化方法,为微波与天线相关课程提供了一项具备综合性、前沿性的课题训练项目.
Keyword ：
天线匹配网络 天线匹配网络 拓扑优化 拓扑优化 智能设计 智能设计 阻抗矩阵 阻抗矩阵
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| GB/T 7714 | 周子恒 , 苏梓暄 , 周彦峰 et al. 天线匹配网络拓扑优化:理论建模与数值实验 [J]. | 实验技术与管理 , 2024 , 41 (11) : 1-7 . |
| MLA | 周子恒 et al. "天线匹配网络拓扑优化:理论建模与数值实验" . | 实验技术与管理 41 . 11 (2024) : 1-7 . |
| APA | 周子恒 , 苏梓暄 , 周彦峰 , 张哲晨 , 许志猛 , 陈志璋 . 天线匹配网络拓扑优化:理论建模与数值实验 . | 实验技术与管理 , 2024 , 41 (11) , 1-7 . |
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Abstract ：
Localizing and reconstructing interference sources is crucial in applications such as electromagnetic interference. While the electromagnetic time-reversal (TR) method has been proposed for source localization, there is limited experimental validation for TR source reconstructions. This letter presents a theoretical analysis and experiments that validate the feasibility of TR source reconstruction within a closed metallic cavity. Wideband signals emitted by the sources are measured at preselected locations in the frequency domain using a vector network analyzer. These measurements are then converted to time-domain signals using a simple algorithm and subsequently time-reversed. The time-reversed signals are injected back into the solution domain, and backward propagation is numerically simulated to locate sources, incorporating space and time kurtoses. The results confirm the effectiveness of the TR method, validating the theoretical analysis and providing a pathway for developing a realistic hardware-based TR source reconstruction system.
Keyword ：
Electromagnetics Electromagnetics Frequency-domain analysis Frequency-domain analysis Kurtosis Kurtosis localizing localizing Mathematical models Mathematical models metallic cavity metallic cavity Network analyzers Network analyzers Probes Probes source reconstruction source reconstruction Time-domain analysis Time-domain analysis time reversal (TR) time reversal (TR) Transmission line measurements Transmission line measurements
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| GB/T 7714 | Cai, Jun , Li, Juan , Chen, Zhizhang David et al. The Time-Reversal Method for Source Reconstructions Within a Metallic Cavity: An Experimental Validation [J]. | IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS , 2024 , 23 (1) : 444-448 . |
| MLA | Cai, Jun et al. "The Time-Reversal Method for Source Reconstructions Within a Metallic Cavity: An Experimental Validation" . | IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 23 . 1 (2024) : 444-448 . |
| APA | Cai, Jun , Li, Juan , Chen, Zhizhang David , Feng, Xiaoyao , Ge, Yuehe , Zhou, Ziheng et al. The Time-Reversal Method for Source Reconstructions Within a Metallic Cavity: An Experimental Validation . | IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS , 2024 , 23 (1) , 444-448 . |
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设计了一种小型化超高频（UHF, ultra-high frequency）射频识别（RFID, radio frequency identification）标签天线。该天线由内外两个方形螺旋谐振器短接构成，通过改变外圈螺旋谐振器的边长和内外圈螺旋谐振器的间距，可以有效调节标签天线的谐振频率。仿真结果表明，标签天线阻抗匹配良好，频带范围覆盖整个超高频频段（840～960 MHz），总尺寸为7.60 mm×7.60 mm×0.05 mm，比传统螺旋谐振器（SR, spiral resonator）天线小96%。测试结果表明，在4 W有效全向辐射功率条件下，标签天线在910 MHz处读取距离达到最大。所提小型化超高频射频识别标签天线具有尺寸小、频带宽、成本低和易于批量制作的特点，适用于对尺寸要求较小的应用环境。
Keyword ：
射频识别 射频识别 小型化 小型化 标签天线 标签天线 螺旋谐振器 螺旋谐振器 超高频 超高频
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| GB/T 7714 | 戴利斌 , 许志猛 , 袁家德 . 基于方形螺旋谐振器的紧凑型RFID标签天线 [J]. | 物联网学报 , 2024 , 8 (01) : 147-152 . |
| MLA | 戴利斌 et al. "基于方形螺旋谐振器的紧凑型RFID标签天线" . | 物联网学报 8 . 01 (2024) : 147-152 . |
| APA | 戴利斌 , 许志猛 , 袁家德 . 基于方形螺旋谐振器的紧凑型RFID标签天线 . | 物联网学报 , 2024 , 8 (01) , 147-152 . |
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A miniaturized ultra-high frequency (UHF) radio frequency identification (RFID) tag antenna was designed. The antenna was composed of two square spiral resonators shorted inside and outside. By adjusting the edge length of the outer ring spiral resonator and the spacing between the inner and outer ring spiral resonators, the resonant frequency of the proposed tag antenna could be effectively tuned. The simulation results show that the proposed tag antenna has good impedance matching and the frequency band range covers the whole UHF band (840～960 MHz). It has a dimension of 7.60 mm×7.60 mm×0.05 mm, which is 96% smaller than the traditional spiral resonator (SR) antenna. The measure result shows that the proposed tag antenna achieves the maximum reading distance at 910 MHz in 4 W effective isotropic radi-ated power. The proposed UHF RFID tag antenna has some advantages of small size, wide frequency band, low cost and easy batch fabrication, and is suitable for applications with small size requirements. © 2024, Beijing Xintong Media Co., Ltd. All rights reserved.
Keyword ：
miniaturization miniaturization radio frequency identification radio frequency identification spiral resonator spiral resonator tag antenna tag antenna ultra-high frequency ultra-high frequency
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| GB/T 7714 | Dai, L. , Xu, Z. , Yuan, J. . Compact RFID tag antenna based on square spiral resonator [J]. | Chinese Journal on Internet of Things , 2024 , 8 (1) : 147-152 . |
| MLA | Dai, L. et al. "Compact RFID tag antenna based on square spiral resonator" . | Chinese Journal on Internet of Things 8 . 1 (2024) : 147-152 . |
| APA | Dai, L. , Xu, Z. , Yuan, J. . Compact RFID tag antenna based on square spiral resonator . | Chinese Journal on Internet of Things , 2024 , 8 (1) , 147-152 . |
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The stable vehicular space-air-ground integrated network (SAGIN) requires high-gain multi-beam/beam-steering antenna systems. In this paper, we propose a compact high-gain wideband circularly-polarized (CP) beam-steering antenna with novel rotatable phase-gradient metasurface (PGM) transmitarrays for the SAGIN. It consists of a novel substrate-integrated-waveguide (SIW) array feed and three innovative metasurface transmitarrays (M-0, M-1, and M-2), capable of providing any compensation phases between 0 degrees and 360 degrees. The novel PGM unit cells have two identical CP U-slot patches that perform CP-to-CP conversions with high transmission efficiencies. In addition, a new and accurate beam-steering analytical formulations are proposed for fast predictions of scanning angles. Experimental results show that the proposed compact SIW array feed achieves an aperture efficiency of 58.8%, a 3-dB gain bandwidth of 10.8%, and a 3-dB axial ratio (AR) bandwidth of over 23%. The proposed entire beam-steering antenna achieves a peak gain of 27.56 dBic, which corresponds to an aperture efficiency of 48.5%, and an exceptionally wide 3-dB AR bandwidth within the scanning range. It is a strong candidate for future millimeter-wave communications in satellite and radar systems and vehicular communications.
Keyword ：
Beam-steering Beam-steering circular polarization circular polarization phase gradient metasurface (PGM) phase gradient metasurface (PGM) substrate integrated waveguide (SIW) substrate integrated waveguide (SIW) vehicular communication vehicular communication
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| GB/T 7714 | Wang, Jingru , Ge, Yuehe , Chen, Zhizhang David et al. Compact Wideband Circularly-Polarized Mechanically Beam-Steering Antenna for Ka-Band Vehicular Communications [J]. | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY , 2024 , 73 (3) : 3393-3403 . |
| MLA | Wang, Jingru et al. "Compact Wideband Circularly-Polarized Mechanically Beam-Steering Antenna for Ka-Band Vehicular Communications" . | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 73 . 3 (2024) : 3393-3403 . |
| APA | Wang, Jingru , Ge, Yuehe , Chen, Zhizhang David , Chu, Zhiyu , Chen, Jiahong , Zhou, Ziheng et al. Compact Wideband Circularly-Polarized Mechanically Beam-Steering Antenna for Ka-Band Vehicular Communications . | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY , 2024 , 73 (3) , 3393-3403 . |
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This article presents a novel millimeter-wave (mm-wave) radar-based continuous motion detection approach called mmCMD for the long-term care of the elderly. The proposed mmCMD visualizes the micro-Doppler signatures of continuous motions generated from millimeter radar as images, which are then analyzed by an object detection network for continuous motion detection. To improve the imaging quality of micro-Doppler signatures, a dynamic feature visualization (DFV) method is proposed by selectively mapping the micro-Doppler matrix (MDM) elements with significant values, highlighting human motion to enhance subsequent detection network's accuracy in capturing the details of the motion. Furthermore, a novel detection network is designed for the visualized micro-Doppler images by combining the specially designed fusion squeeze-and-excitation (FSE) module with the coordinate attention (CA) into the YOLOv5 architecture, which is distinct from prior works that overlook global contextual information. Experimental results demonstrate that the proposed mmCMD achieves a mean average precision (mAP) of 93% at the intersection over union (IoU) thresholds from 0.5 to 0.95 and an F1 score of 99% for 12 actions, which makes it a promising solution for remotely monitoring and detecting elderly individuals' activities to enhance safety and risk prevention capabilities.
Keyword ：
Continuous human motion detection Continuous human motion detection frequency-modulated continuous-wave (FMCW) radar frequency-modulated continuous-wave (FMCW) radar micro-Doppler effect micro-Doppler effect object detection object detection YOLOv5 YOLOv5
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| GB/T 7714 | Xu, Zhimeng , Ding, Junyin , Zhang, Shanshan et al. mmCMD: Continuous Motion Detection From Visualized Radar Micro-Doppler Signatures Using Visual Object Detection Techniques [J]. | IEEE SENSORS JOURNAL , 2024 , 24 (3) : 3394-3405 . |
| MLA | Xu, Zhimeng et al. "mmCMD: Continuous Motion Detection From Visualized Radar Micro-Doppler Signatures Using Visual Object Detection Techniques" . | IEEE SENSORS JOURNAL 24 . 3 (2024) : 3394-3405 . |
| APA | Xu, Zhimeng , Ding, Junyin , Zhang, Shanshan , Gao, Yueming , Chen, Liangqin , Vasic, Zeljka Lucev et al. mmCMD: Continuous Motion Detection From Visualized Radar Micro-Doppler Signatures Using Visual Object Detection Techniques . | IEEE SENSORS JOURNAL , 2024 , 24 (3) , 3394-3405 . |
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The emergence of leadless pacemakers marks a revolutionary breakthrough in cardiac rhythm management. However, current leadless cardiac pacemakers (LCPs) can only pace at a single location, which fails to meet the demand for multi-ventricular sequential pacing in most patients. To address this limitation and achieve multi-chamber pacing with LCPs, it is essential to analyze the signal transmission characteristics of intracardiac conduction communication. Many existing studies analyze the signal transmission characteristics of intracardiac channels based on static experimental measurements. However, our previous research revealed that the signaling characteristics of intracardiac channels vary with the cardiac beat cycle. Consequently, it is inaccurate to consider the channel gain measured in any arbitrary state as representative of the channel characteristics during the establishment of intracardiac signaling communication. Thus, the measurement results cannot be reliably used as a reference for LCP design.In this study, we developed a semisolid spherical mimic using a mixture composed of 91.94% deionized water, 2.63% agar, 0.18% potassium chloride, and 5.25% hydroxyethylcellulose (HEC). This mimic was designed to simulate the channel characteristics during the establishment of intracardiac signal conduction communication. The experimental measurements of the mimic demonstrated a difference of no more than 2 dB compared to the dynamic measurements of the isolated porcine heart in the frequency range of 1 MHz to 20 MHz. This mimic offers a highly accurate, reproducible, and stable method to analyze the signal transmission characteristics of intracardiac channels in conductive cardiac communication (CIC) studies. Moreover, it provides an effective reference for CIC transceiver design studies. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.
Keyword ：
artificial tissue-mimicking phantom artificial tissue-mimicking phantom cardiac cycle cardiac cycle conductive cardiac communication conductive cardiac communication
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| GB/T 7714 | Wang, H. , Wang, J. , Yang, S. et al. Cardiac Phantoms for Signal Transmission Characteristics Analysis of Leadless Pacemakers [未知]. |
| MLA | Wang, H. et al. "Cardiac Phantoms for Signal Transmission Characteristics Analysis of Leadless Pacemakers" [未知]. |
| APA | Wang, H. , Wang, J. , Yang, S. , Wei, Z. , Vasić, Ž.L. , Yang, J. et al. Cardiac Phantoms for Signal Transmission Characteristics Analysis of Leadless Pacemakers [未知]. |
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Heart rate variability (HRV), indicating the variation in intervals between consecutive heartbeats, is a crucial physiological indicator of human health. However, detecting HRV using frequency-modulated continuous-wave (FMCW) radar is highly susceptible to interference from respiration, minor body movements, and environmental noise, especially in multi-target scenarios. To address these challenges, we propose the Health-Radar system, which comprises three functional modules. In the target detection module, the system accurately identifies the number and locations of targets. In the phase extraction module, the signal undergoes DC offset calibration to extract the chest displacement signals. In the heartbeat signal extraction module, we introduce Health-VMD, an adaptive parameter variational mode decomposition (VMD) method. This method optimizes the VMD parameters using an improved grasshopper optimization algorithm (GOA) and accurately extracts vital sign signals from chest displacement signals to estimate HRV. Additionally, we propose a novel objective function, composed of permutation entropy, mutual information, and energy loss rate (PME), specifically designed for vital sign extraction. Experiments with multiple participants in various scenarios demonstrated that the designed system can accurately identify different targets and detect HRV with high precision. The root mean square error (RMSE) of the detected inter-beat intervals (IBI) is 29.72ms, the RMSE of the standard deviation of NN intervals (SDNN) is 4.1ms, and the RMSE of the root mean square of successive differences (RMSSD) is 18.61ms, outperforming existing methods. © 2001-2012 IEEE.
Keyword ：
Frequency modulated continuous wave (FMCW) radar Frequency modulated continuous wave (FMCW) radar heart rate variability (HRV) heart rate variability (HRV) multi-target vital signs detection multi-target vital signs detection noncontact detection noncontact detection variational mode decomposition (VMD) variational mode decomposition (VMD)
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| GB/T 7714 | Xu, Z. , Ye, T. , Chen, L. et al. Health-Radar: Noncontact Multi-Target Heart Rate Variability Detection Using FMCW Radar [J]. | IEEE Sensors Journal , 2024 , 25 (1) : 405-418 . |
| MLA | Xu, Z. et al. "Health-Radar: Noncontact Multi-Target Heart Rate Variability Detection Using FMCW Radar" . | IEEE Sensors Journal 25 . 1 (2024) : 405-418 . |
| APA | Xu, Z. , Ye, T. , Chen, L. , Gao, Y. , Chen, Z. . Health-Radar: Noncontact Multi-Target Heart Rate Variability Detection Using FMCW Radar . | IEEE Sensors Journal , 2024 , 25 (1) , 405-418 . |
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Currently, there is no standardized approach for evaluating the efficiency of planar wireless power transfer (WPT) systems across varying specifications and sizes, particularly under positional deviations. This paper introduces an innovative approach to assess the positional tolerance of single-transmitter, single-receiver planar magnetically coupled resonant wireless power transfer (MCR-WPT) systems. We present a normalized effective working range that quantifies the operational range of different MCR-WPT systems where transmission efficiency degradation is limited to a specified value, such as sigma%. This approach measures the system's resilience to coil misalignment and identifies key parameters influencing transmission efficiency. The practicality and effectiveness of the proposed method are demonstrated through experimental validation.
Keyword ：
Effective Working Range Effective Working Range Normalization Normalization Position Offset Resistance Performance Indicator Position Offset Resistance Performance Indicator Single-Transmitter Single-Receiver System Single-Transmitter Single-Receiver System
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| GB/T 7714 | Wang, Weikun , Chen, Jinyu , Xu, Zhimeng et al. A Method for Fvaluating the Position Tolerance Performance of a Planar Magnetic Coupling Resonant Wireless Power Transfer System [J]. | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 , 2024 : 263-265 . |
| MLA | Wang, Weikun et al. "A Method for Fvaluating the Position Tolerance Performance of a Planar Magnetic Coupling Resonant Wireless Power Transfer System" . | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 (2024) : 263-265 . |
| APA | Wang, Weikun , Chen, Jinyu , Xu, Zhimeng , Chen, Zhizhang , Li, Juan . A Method for Fvaluating the Position Tolerance Performance of a Planar Magnetic Coupling Resonant Wireless Power Transfer System . | 2024 CROSS STRAIT RADIO SCIENCE AND WIRELESS TECHNOLOGY CONFERENCE, CSRSWTC 2024 , 2024 , 263-265 . |
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