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学者姓名：许志猛
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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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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 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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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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In this paper, a context-based human target detection and position estimation algorithm, as well as a position calibration algorithm based on radar irradiation angle are proposed to improve the positioning accuracy, which is limited by the sparse and easily submerged characteristics of the point cloud generated by millimeter-wave radar, which leads to difficulty in achieving high-precision positioning. Furthermore, an indoor target positioning and tracking system is built using 77 GHz millimeter-wave radar to verify the proposed algorithms. The experimental results indicate that the proposed algorithms can improve the positioning accuracy both in single-person and multi-person positioning scenarios, with median positioning errors 8.7 cm (36.7% decrease) and 12.95 cm (average) respectively. Therefore, the proposed sensing method is considered as a very promising technique for designing a high precision human trajectory tracking and positioning radar system.
Keyword ：
millimeter-wave radar millimeter-wave radar point cloud point cloud target positioning target positioning
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| GB/T 7714 | Xu, Zhimeng , Wu, Zhenbin , Li, Dan et al. Position estimation and calibration for high precision human positioning and tracking using millimeter-wave radar [J]. | MEASUREMENT SCIENCE AND TECHNOLOGY , 2023 , 34 (2) . |
| MLA | Xu, Zhimeng et al. "Position estimation and calibration for high precision human positioning and tracking using millimeter-wave radar" . | MEASUREMENT SCIENCE AND TECHNOLOGY 34 . 2 (2023) . |
| APA | Xu, Zhimeng , Wu, Zhenbin , Li, Dan , Chen, Liangqin , Zhang, Shanshan , Chen, Zhizhang (David) . Position estimation and calibration for high precision human positioning and tracking using millimeter-wave radar . | MEASUREMENT SCIENCE AND TECHNOLOGY , 2023 , 34 (2) . |
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Like its outdoor counterpart (e.g., GPS), an indoor tracking system can bring about disruptive changes in how we live and work. This paper proposes a location and tracking system using a single WiFi link based on channel state information. The system can realize real-time, decimeter-level localization and tracking. In this system, phase calibration and static path elimination are realized by multiplying the conjugate signals of different antennas. Then, a three-dimensional MUSIC algorithm is employed to estimate the angle of arrival (AOA), the time of flight (TOF), and the velocity of a target. A scheme is then developed to adjust the MUSIC search range and reduce the computation time from about ten hours to tens of seconds. The Widar2.0 data set from Tsinghua University are used for the experiments; the proposed system is found to have an average tracking error of 0.68 m in the three environments of classroom, office, and corridor, which is better than the existing single link localization and tracking system.
Keyword ：
angle of arrival (AOA) angle of arrival (AOA) channel state information (CSI) channel state information (CSI) Doppler Doppler indoor tracking indoor tracking Kalman filter Kalman filter MUSIC MUSIC time of flight (TOF) time of flight (TOF) tracking tracking velocity velocity WiFi WiFi
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| GB/T 7714 | Tian, Li-Ping , Chen, Liang-Qin , Xu, Zhi-Meng et al. A Localization and Tracking System Using Single WiFi Link [J]. | REMOTE SENSING , 2023 , 15 (9) . |
| MLA | Tian, Li-Ping et al. "A Localization and Tracking System Using Single WiFi Link" . | REMOTE SENSING 15 . 9 (2023) . |
| APA | Tian, Li-Ping , Chen, Liang-Qin , Xu, Zhi-Meng , Chen, Zhizhang (David) . A Localization and Tracking System Using Single WiFi Link . | REMOTE SENSING , 2023 , 15 (9) . |
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People easily get distracted or tired after long-duration actions such as driving and online classes, which can lead to accidents or poor efficiency. To detect such human behaviors,a head motion detection method based on low-resolution infrared array sensors is proposed with the protection of personal privacy. First,promi. nent areas of the human body are extracted based on image processing techniques. Then a 3D image fusion algo. rithm is developed to extract the change information in the spatiotemporal domain. Finally,an improved residual network is developed to achieve head motion classification. Ten head movements are designed for driving and on. line classroom scenarios. Experimental results show that in the detection range of 50 cm to 100 cm,our average recognition rate is 96. 76%,and the processing speed is 9 frames per second,which is better than theexisting state-of-the-art algorithms. The accuracy of the system is 93. 7% when it is applied to the vehicle experiment.
Keyword ：
3D image fusion 3D image fusion distraction behavior distraction behavior head motion detection head motion detection infrared array sensor infrared array sensor
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| GB/T 7714 | Chen Liang-Qin , Zeng Ming-Xuan , Xu Zhi-Meng et al. Head motion detection based on low resolution infrared array sensor [J]. | JOURNAL OF INFRARED AND MILLIMETER WAVES , 2023 , 42 (2) : 276-284 . |
| MLA | Chen Liang-Qin et al. "Head motion detection based on low resolution infrared array sensor" . | JOURNAL OF INFRARED AND MILLIMETER WAVES 42 . 2 (2023) : 276-284 . |
| APA | Chen Liang-Qin , Zeng Ming-Xuan , Xu Zhi-Meng , Chen Zhi-Zhang . Head motion detection based on low resolution infrared array sensor . | JOURNAL OF INFRARED AND MILLIMETER WAVES , 2023 , 42 (2) , 276-284 . |
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This article presents a wideband printed-monopole antenna pair with enhanced isolation. A clear two-step method based on even-mode (EM) and odd-mode (OM) analyses is developed for antenna decoupling and matching: first, the OM input impedance of the antenna pair is matched by adjusting the element spacing; next, the EM input impedance is matched by adding a coupled TEM transmission line. Those two steps are independent and easy to implement. Notably, the use of a nondispersive coupled transmission line facilitates wideband decoupling and intrinsically allows an extremely small feed-point spacing. The proposed antenna pair is experimentally tested: it offers isolation higher than 20 dB and total efficiency higher than 87% from 3.7 to 7.3 GHz (a fractional bandwidth of 65.5%). The separation between the two feed points is only 5.6 mm (0.069 ? at 3.7 GHz). Furthermore, we construct a four-element multiple-input-multiple-output (MIMO) array by intersecting orthogonally two of the proposed antenna pairs at their central line, which offer an isolation level better than 20 dB from 3.8 to 7.4 GHz for every two ports. With a straightforward design process, compact feeding structures, and wideband performances, the proposed dual-and four-element MIMO antennas are promising for the fifth-generation wireless communication.
Keyword ：
Antenna array mutual coupling Antenna array mutual coupling Antenna arrays Antenna arrays antenna diversity antenna diversity Antenna feeds Antenna feeds Antennas Antennas coupled transmission line coupled transmission line Impedance Impedance MIMO communication MIMO communication multiple-input-multiple-output (MIMO) multiple-input-multiple-output (MIMO) Power transmission lines Power transmission lines Transmission line antennas Transmission line antennas wideband antennas wideband antennas
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| GB/T 7714 | Zhou, Ziheng , Ge, Yuehe , Yuan, Jiade et al. Wideband MIMO Antennas With Enhanced Isolation Using Coupled CPW Transmission Lines [J]. | IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION , 2023 , 71 (2) : 1414-1423 . |
| MLA | Zhou, Ziheng et al. "Wideband MIMO Antennas With Enhanced Isolation Using Coupled CPW Transmission Lines" . | IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 71 . 2 (2023) : 1414-1423 . |
| APA | Zhou, Ziheng , Ge, Yuehe , Yuan, Jiade , Xu, Zhimeng , Chen, Zhizhang David . Wideband MIMO Antennas With Enhanced Isolation Using Coupled CPW Transmission Lines . | IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION , 2023 , 71 (2) , 1414-1423 . |
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