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A Miniaturized Circularly Polarized Microstrip Antenna Utilizing Meandering Technique and Minkowski-Sierpinski Fractal Structure

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Progress in Electromagnetics Research C 2025年 153卷 119-127页

作者： Wang, Lin Zhang, Liang Yang, Lixia Wang, Xinyan Sheng, Xialin Jin, Quan Tian, Po School of Electronic and Information Engineering Anhui University Hefei230601 China Anhui Province Key Laboratory of Simulation Calculation and Design for Electronic Information System Hefei Normal University Hefei230601 China

In this paper, we present a miniaturized design of a microstrip antenna achieved through the combination of MinkowskiSierpinski (M-S) fractal structure and meandering technique, enabling the antenna to be integrated into smaller systems. The antenna achieves right-hand circular polarization (RHCP) through chamfering on a square patch. Further miniaturization is accomplished by loading four symmetrically opposed L-shaped slots along with the M-S fractal structure. Specifically, the Minkowski structure undergoes a single iteration, while the Sierpinski fractal is iterated twice on the once-iterated Minkowski fractal to optimize performance. The antenna is manufactured on a textile substrate TLX-8 with dimensions of 50 mm × 50 mm × 0.762 mm, representing a 54.3% reduction in size compared to traditional designs. Moreover, the substrate exhibits robust mechanical properties. Experimental results demonstrate that the antenna achieves excellent radiation characteristics within a bandwidth of 1.563 to 1.581 GHz and an axial ratio bandwidth of 1.569 to 1.578 GHz. These performance metrics meet the requirements for modern Global Positioning system (GPS) antenna applications, highlighting the design’s suitability for advanced integration in contemporary electronic systems. © 2025, Electromagnetics Academy. All rights reserved.

关键词： Microstrip antennas

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An Improved Compressive Sensing-Based Model for Efficient Analysis of Monostatic Electromagnetic Scattering Problems

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IEEE Microwave and Wireless Technology Letters 2025年第4期35卷 388-391页

作者： Qi, Qi Fan, Yunuo Cao, Xinyuan Liu, Yi Kong, Meng Huang, Zhixiang Wu, Xianliang Hefei Normal University Anhui Province Key Laboratory of Simulation Calculation and Design for Electronic Information System Hefei230601 China Anhui University Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Hefei230601 China

To further accelerate the analysis of monostatic electromagnetic (EM) scattering problems of objects, an improved compressive sensing (CS)-based model is proposed. First, an orthogonal subspace spanned by the wide-angle induced currents is identified by means of the wide-angle incident sources. Then, the sparse transform of the induced currents is replaced by the subspace projection. In addition, an optimal number of measurements is determined, only slightly larger than the dimension of the subspace. Finally, the recovery algorithm is simplified to the least-squares method to solve the resulting overdetermined system. Compared with the traditional CS-based model, the proposed model significantly improves the efficiency of the recovery step and optimizes both the requirement for and the way of determining the number of measurements. © 2023 IEEE.

关键词： Least squares approximations

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Moving Target Defense Meets Artificial Intelligence-Driven Network: A Comprehensive Survey

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IEEE Internet of Things Journal 2025年第10期12卷 13384-13397页

作者： Zhang, Tao Kong, Fanyu Deng, Dongshang Tang, Xiangyun Wu, Xuangou Xu, Changqiao Zhu, Liehuang Liu, Jiqiang Ai, Bo Han, Zhu Deng, Robert H. Beijing Jiaotong University School of Cyberspace Science and Technology Beijing100044 China Anhui Engineering Research Center for Intelligent Applications and Security of Industrial Internet Anhui243002 China Minzu University of China School of Information Engineering Beijing100081 China Chongqing University College of Computer Science Chongqing400044 China Anhui University of Technology School of Computer Science and Technology Anhui Province Key Laboratory of Digital Twin Technology in Metallurgical Industry Anhui243002 China Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology China Beijing Institute of Technology School of Cyberspace Science and Technology Beijing100081 China Beijing Jiaotong University School of Electronic and Information Engineering Frontiers Science Center for Smart High-speed Railway System Beijing100044 China University of Houston Department of Electrical and Computer Engineering HoustonTX77004 United States Singapore Management University Department of Information Systems Singapore Singapore

Based on emerging Artificial Intelligence (AI) tasks, cloud-edge-terminal architecture can provide powerful computing, intelligent interconnection, and real-time response, which can also be regarded as AI-driven network. Unfortunately, multiple network layers in the AI-driven network usually face various types of network threats such as malicious network reconnaissance, side-channel attacks, and Distributed Denial of Service (DDoS). Traditional security solutions respond to network threats after the occurrence of attacks. To solve this problem, the concept of Moving Target Defense (MTD) has been proposed as a proactive defense mechanism that aims to defend against cyber attacks before they occur. In this paper, we firstly provide a thorough analysis of the threats in the cloud-edge-terminal network. Then we conduct a comprehensive survey to discuss the concept, design principles, and main classifications of MTD. Next, we further introduce the development potential in terms of AI-powered MTD on each network layer. Meanwhile, we also explore how MTD improves the security of AI algorithms. Lastly, we describe the existing challenges and research directions of MTD. The aim of this paper is to provide an in-depth understanding for the readers on how to realize the integration between MTD and AI-driven network. © 2014 IEEE.

关键词： Cloud security

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Tailoring conductive network Zn@NPC@MWCNTs nanocomposites derived from ZIF-8 as high-performance electromagnetic absorber for the whole X-Band

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Defence Technology（防务技术） 2023年第5期23卷 189-200页

作者： Shi-bin Lu Ying Meng Hai-bo Wang Xian-wei Jiang Jin Yang Ning Wei Lin Jin Li-juan Wan Hao Tang Qian-qian Hou Anhui Province Key Laboratory of Simulation and Design for Electronic Information System Hefei Normal UniversityHefei230601PR China Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province Hefei Normal UniversityHefei230601PR China

A porous 3D cross-linked conductive network pierced by multi-wall carbon nanotubes(MWCNTs) was successfully designed from zeolitic imidazolate framework-8(ZIF-8). Zn@NPC@MWCNTs composites were tailored by the facile regulating the mass ratios and thermal annealing treatment. Due to the combination of less eddy current loss and dielectric loss together with multiple reflection attenuation caused by a unique structure. With a 10 wt% filler loading, the Zn@NPC@MWCNTs composites carbonized at 800℃ show two high reflection loss(RL) values with different thicknesses. An RL value is-53.18 dB with 4.09 mm thickness in the C-Band(4-8 GHz), and a minimum RL can reach-74.83 d B(10.8 GHz)with a matching thickness of 2.749 mm. The effective absorption bandwidth is 4 GHz(from 8 to 12 GHz,RL ≤-10 d B), which just covers the full X-band. Low cost and easy preparation can also provide advantages to develop MOF-based materials as effective EMW absorbents.

关键词： ZIF-8 Electromagnetic wave absorption X-band C-Band

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Compressed Sensing for Solving Electromagnetic Scattering Problems of Multi-scale Complex Structures over a Wide Range of Incident Angle

Compressed Sensing for Solving Electromagnetic Scattering Pr...

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2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Hu, Jin-Hua Chen, Ming-Sheng Wu, Xian-Liang Hefei Normal University Anhui Province Key Laboratory of Simulation and Design for Electronic Information System China

ISBN: (纸本)9781665452366

Investigation on the electromagnetic characteristics of muti-scale complex structures over a wide range of incident angle is carried outed in this paper. A new scheme based on compressed sensing (CS) theory is proposed and introduced into the method of moments (MOM). This technique need to form several new excitation sources that including various spatial information to obtain several measurements. With the help of proper sparse representation, induced currents of any incident angles can be calculated by reconstructed techniques. To demonstrate the efficiency and the accuracy of the proposed method, numerical simulations of the axial mode helical antenna with a cup ground is accomplished by the new scheme, and the pattern and RCS of the antennas are accurately reconstructed. © 2022 IEEE.

关键词： Method of moments

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design of millimeter wave array antenna decoupling construction based on metasurface 4

Design of millimeter wave array antenna decoupling construct...

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4th International Applied Computational Electromagnetics Society Symposium in China, ACES-China 2021

作者： Zhen, Tianzheng Zhang, Zhongxiang Wu, Xianliang Anhui University Electronic and Information Engineering Hefei China AnHui Province Key Laboratory of Simulation and Design for Electronic Information System Hefei China

ISBN: (纸本)9781733509619

The proposed structure is a metamaterial-based coating to reduce the coupling of the array antenna operating in the millimeter-wave band. The metasurface structure is composed of rectangular ring slotted elements in a periodic arrangement. By suppressing the space and surface waves between the array antennas, the isolation degree in the working frequency band (23.8GHz-25.2GHz) can be kept below -25dB. © 2021 Applied Computational Electromagnetics Society (ACES).

关键词： Metamaterials

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Magnetic and magnetocaloric effect in a stuffed honeycomb polycrystalline antiferromagnet GdInO_(3)

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Chinese Physics B 2022年第6期31卷 656-662页

作者： Yao-Dong Wu Wei-Wei Duan Qiu-Yue Li Yong-Liang Qin Zhen-Fa Zi Jin Tang Universities Joint Key Laboratory of Photoelectric Detection Science and Technology in Anhui Province Anhui Province Key Laboratory of Simulation and Design for Electronic Information Systemand School of Physics and Materials EngineeringHefei Normal UniversityHefei 230601China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHFIPSAnhuiChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China

The magnetic and magnetocaloric properties were studied in a stuffed honeycomb polycrystalline antiferromagnet GdInO_(3).The onset temperature of antiferromagnetic ordering was observed at~2.1 *** thermal and magnetic hystereses suggest a reversible magnetocaloric effect(MCE)in the GdInO_(3) *** the magnetic field changes of 0 kOe-50 kOe and 0 kOe-70 kOe,the maximum magnetic entropy change values are 9.65 J/kg·K and 18.37 J/kg·K,respectively,near the liquid helium temperature,with the corresponding relative cooling power values of 115.01 J/kg and211.31 J/*** MCE investigation of the polycrystalline GdInO_(3) serves to illuminate more exotic properties in this frustrated stuffed honeycomb magnetic system.

关键词： GdInO_(3) magnetization magnetocaloric effects stuffed honeycomb antiferromagnet

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SPREAD SPECTRUM INDEX MULTIPLE-ACCESS UNDERWATER ACOUSTIC COMMUNICATION system

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Telecommunications and Radio Engineering (English translation of Elektrosvyaz and Radiotekhnika) 2021年第3期80卷 1-13页

作者： Chen, X. Wang, N. Ding, D. Zhang, G. Yan, P. Cao, F. Anhui Province Key Laboratory of Simulation and Design for Electronic Information System Hefei Normal University Hefei230601 China Anhui Provincial Key Laboratory of Intelligent Building and Building Energy Conservation Anhui Jianzhu University Hefei230022 China College of Electronic Information Engineering Anhui University Hefei230601 China

A novel spread spectrum index-modulation multiple-access underwater acoustic (SIM-UWA) communication system is proposed in this study to satisfy the requirements of wireless communication systems for multi-access reception and stable transmission during large-scale marine resource detection. The proposed system integrates differential chaos shift keying and index-modulation techniques. Chaotic spread spectrum sequences are used to counteract multipath fading encountered in the transmission of acoustic waves in seawater and multipath interference at the receiver end, thereby ensuring the stable transmission of information. Index modulation is applied to establish index mapping between the detector serial number and information structure, enabling multi-access reception capability without introducing multi-user interference. In the simulation experiments, the SIM-UWA system was simulated in different types of marine channels, and the effects of the spread spectrum coefficient on the system performance were analyzed. Additionally, this system was compared with an existing spread spectrum underwater acoustic communication technology. The results showed that the novel system can achieve multiple-access reception while maintaining transmission stability. © 2021 Begell House Inc.. All rights reserved.

关键词： Underwater acoustic communication

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A High-precision Multi-target Vital Signs Detection Method Based on FMCW Radar

A High-precision Multi-target Vital Signs Detection Method B...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Zhao, Miaomiao Zhang, Zhongxiang Bao, Wenxia Anhui University Hefei China Hefei Normal University Anhui Province Key Laboratory of Simulation and Design for Electronic Information System 230601 China

ISBN: (纸本)9798350375909

At present, most of the radar-based vital signs detection algorithms focus on single-target vital signs measurement, and there are few studies on multi-target vital signs detection. In the detection of multi-target vital signs, the positioning of multiple human targets and the extraction of respiration and heartbeat signals are the difficulties of research. In this paper, a non-contact multiple targets vital signs detection method based on frequency modulated continuous wave (FMCW) radar is proposed for simultaneous detection of the respiration rate and heart rate of multiple people. In this proposed method, the multiple input multiple output (MIMO) mode of radar is utilized to collect vital signs signals of multiple human targets. Then, the minimum variance distortionless response (MVDR) beamforming algorithm is used to enhance the echo signal in the desired direction and suppress the interference signal in other directions, so as to obtain the angle information of the target. By jointly estimating the distance and angle of each target, multiple targets are separated and the phase information of different targets can be extracted. Finally, the variational mode decomposition (VMD) algorithm is utilized to separate and reconstruct the respiration and heartbeat signals from the phase information of different targets, while avoiding the interference of the high-order harmonic components of the respiration signal on the heartbeat signal. The experimental results show that this method is effective in distinguishing multiple targets and realizing accurate respiration rate and heart rate estimation both when the targets are located at different angles at different distances and different angles at the same distance. © 2024 IEEE.

关键词： Radar target recognition

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A Novel Dual-band and Broadband Antenna

A Novel Dual-band and Broadband Antenna

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Zhu, Yihan Zhang, Zhongxiang Ren, Xingang Anhui University Hefei China Hefei Normal University Anhui Province Key Laboratory of Simulation and Design for Electronic Information System 230601 China

ISBN: (纸本)9798350375909

In order to better meet the needs of various fields such as vehicle networking and mobile communications, the operating frequency of the antenna needs to cover multiple frequency bands while satisfying miniaturization. Multi-band and broadband are two common solutions. In this paper, a novel structure with dual-band broadband antenna is proposed, which can cover 3G, 4G and 5G bands and has broadband characteristics. In an effort to obtain the dual-band characteristics, the antenna adopts a double-branch structure and by using a folded T-shaped structure to meet the needs of antenna miniaturization. Aiming at the design of broadband, the antenna adopts the method of changing the branch structure to make the antenna bandwidth cover multiple mobile communication frequency bands. The conical structure can not only obtain broadband characteristics but also meet the miniaturization requirements. The antenna given in this paper can be used in a variety of scenarios such as vehicle networking, mobile communications, etc. The frequency band covered by this antenna meets people's entertainment requirements for AR/VR, games, mobile office and soon. The whole antenna measures 70 mm£60 mm£2 mm, which meets the requirement of miniaturization. The simulation results show that the bandwidth of the antenna covers two frequency bands of 0.82-1.02 GHz and 1.79-4.04 GHz. The bandwidth of the antenna reaches 20 MHz and 2250 MHz respectively, and has good omnidirectionality in the horizontal plane. © 2024 IEEE.

关键词： Bandwidth

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