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2024 International Symposium on Antennas and Propagation, ISAP 2024

作者： Yuan, Chenyang Liu, Zehua Ni, Jinxuan Jiang, Hengrui Yan, Yuanming Zhang, Gang School of Electrical and Automation Engineering Nanjing Normal University Nanjing China Jiangsu Key Laboratory of 3D printing Equipment and Manufacturing Nanjing Normal University Nanjing China

ISBN: (纸本)9798350364774

A wideband tunable filtering phase shifter (TFPS) is presented in this work. The proposed phase shifter uses parallel coupled line stepped impedance resonator (SIR) structure to form the wideband filtering path. The open-ended stub is loaded at the port to introduce a transmission zero (TZ). The tunable part of this work is realized by a tunable phase shift unit (TPSU), which is composed of several varactor diodes at the end of the coupled line. Through analyzing phase characteristics of TPSU and its effect on the circuit, it can be deduced that the phase shifter could control phase shifts continuously. For validation, a wideband TFPS has been designed with an operating frequency range from 1.12 GHz to 2.63 GHz, the simulated results show that this design can control phase shift continuously of more than 180° within wideband fractional bandwidth (FBW) of 80%. © 2024 IEEE.

关键词： Phase shifters

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Properties analysis of PLA/316L stainless steel composite powder for 3d printing 2

Properties analysis of PLA/316L stainless steel composite po...

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2nd International Conference on Medical Imaging and Additive Manufacturing, ICMIAM 2022

作者： Li, Bin Lv, Junling Gu, Hai Zhang, Jie Jiang, Jie Gu, Yan Yang, Xianrui Institute of Intelligence Manufacturing Nantong Institute of Technology Nantong226002 China Jiangsu Key Laboratory of 3D Printing Equipment and Application Technology Jiangsu226002 China School of Mechanical Engineering Nantong Institute of Technology Jiangsu226002 China

ISBN: (纸本)9781510653375

Polylactic acid (PLA) is a biodegradable material widely used in biomedical field. In order to improve the performance of pure PLA, 316 L stainless steel content of 10 vol% to 60 vol % was added to the PLA matrix. Powder physical characteristics tester was used to explore the angle of repose, the angle of collapse, the angle of flat plate and compressibility, the integrated thermal analyzer was for detecting thermal properties of PLA/316 L stainless steel composite. The results showed that the angle of repose and angle of collapse of the composite decreases first and then increases with the increase of 316 L stainless steel powder. The angle of flat plate and compressibility was reduced by the addition of steel powders. When the 316 L stainless steel powder content is 50 vol %, the fluidity of the composite is the best. The high melting point of 316 L stainless steel powder increases the melting point temperature of composites. The prepared PLA/316 L composites can be applied to 3d printing technology represented by fused deposition modeling (FdM). © 2022 SPIE. downloading of the abstract is permitted for personal use only.

关键词： Thermoanalysis

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Rock Climbing‑Inspired Electrohydrodynamic Cryoprinting of Micropatterned Porous Fiber Scaffolds with Improved MSC Therapy for Wound Healing

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Advanced Fiber Materials 2023年第1期5卷 312-326页

作者： Jinjian Huang Jie Wu Jiahang Wang Mengjia Xu Jiao Jiao Yuhao Qiang Feng Zhang Zongan Li Research Institute of General Surgery Jinling HospitalSchool of MedicineSoutheast UniversityNanjing 210009China Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing NARI School of Electrical and Automation EngineeringNanjing Normal UniversityNanjing 210042China Department of Materials Science and Engineering Massachusetts Institute of TechnologyCambridge 02139USA

Impaired wound healing imposes great health risks to ***,mesenchymal stem cell(MSC)therapy has shown potential to improve the healing process,but approaches to employ MSCs in the treatment of wounds remain *** this study,we reported a novel electrohydrodynamic(EHd)cyroprinting method to fabricate micropatterned fiber scaffolds with polycaprolactone(PCL)dissolved in glacial acetic acid(GAC).Cyroprinting ensured the formation of a porous struc-ture of PCL fibers by preventing the evaporation of GAC,thus increasing the surface roughness parameter Ra from 11 to 130 *** to how rough rocks facilitate easy climbing,the rough surface of fibers was able to increase the adhesion of adipose-derived MSCs(AMSCs)by providing more binding sites;therefore,the cell paracrine action of secreting growth factors and chemokines was enhanced,promoting fibroblast migration and vascular endothelial cell tube *** rat models with one-centimeter wound defects,enhanced MSC therapy based on porous PCL fiber scaffolds improved wound healing by augmenting scarless collagen deposition and angiogenesis and reducing proinflammatory ***,this study offers a new and feasible strategy to modulate the surface topography of polymeric scaffolds to strengthen MSC therapy for wound healing.

关键词： Electrohydrodynamic cryoprinting Porous fiber scaffolds Mesenchymal stem cell Wound healing

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Modified Compact High-Q Coaxial Cavity Resonator With Its applications 15

Modified Compact High-Q Coaxial Cavity Resonator With Its Ap...

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15th International Conference on Microwave and Millimeter Wave technology, ICMMT 2023

作者： Rao, Jia-Yu Sun, Cong Chen, Zhu-Yang Zhang, Gang Jiangsu University of Technology School of Electrical and Information Engineering Changzhou213001 China Nanjing Normal University Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing School of Electrical and Automation Engineering Nanjing210046 China

ISBN: (纸本)9798350338874

This article presents a method to modify the coaxial resonator by bending the inner cylinder coaxial into the gradient dumbbell shape coaxial. The new coaxial resonator, gradient dumbbell coaxial resonator (GdCR), could provide very compact sizes while remaining high-quality factors (Qu). Then the GdCR resonator was deployed to design a four-pole bandpass filter (BPF) centred at 3.5 GHz with a fractional bandwidth (FBW) of 5.71%, and a pair of symmetrical transmission zeros (TZs) located at 3.27 and 3.64 GHz for demonstration. The TZs were generated by introducing the capacitive-dominant cross-coupling between resonator 1 and resonator 4, which avoids using the support material as the conventional methods. The theoretical responses were also given for comparison, which showed a good agreement with simulated ones. © 2023 IEEE.

关键词： Bandpass filters

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Structure design of Additive and Subtractive Composite Machining device Based on FdM and Milling 2

Structure Design of Additive and Subtractive Composite Machi...

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2nd International Conference on Mechanical, Electronics, and Electrical and Automation Control, METMS 2022

作者： Li, Bin Lu, Gang Gu, Hai Jiang, Jie Zhang, Jie Sun, Jianhua Zhang, Hao Institute of Intelligence Manufacturing Nantong Institute of Technology Jiangsu Nantong226002 China Jiangsu Key Laboratory of 3D Printing Equipment and Application Technology Jiangsu Nantong226002 China School of Mechanical Engineering Nantong Institute of Technology Jiangsu Nantong226002 China

ISBN: (数字)9781510654785

ISBN: (纸本)9781510654778

In order to solve the problem that the surface quality of the parts by FdM is poor due to the staircase effect, a new method combining milling and FdM additive manufacturing was proposed. In this study, a composite processing device for additive and subtractive materials was designed for small forming parts. First of all, put forward a set of overall structure design scheme. Secondly, the key components of composite machining device were designed. Then, the designed parts were assembled virtually. Finally, the finite element simulation method was used to analyze the gantry frame and worktable. The results show that the design scheme can meet the requirements of strength and stiffness. © 2022 SPIE

关键词： Milling (machining)

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Potential Implications of Mixing Perturbations on Robust Stability for Linear Uncertain Systems 63

Potential Implications of Mixing Perturbations on Robust Sta...

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63rd IEEE Conference on decision and Control, CdC 2024

作者： Mao, Qi Chen, Jianqi Nanjing Normal University School of Electrical and Automation Engineering Nanjing China Jiangsu Key Laboratory of 3D Printing Equipment & Manufacturing Nanjing China Nanjing University Center for Advanced Control and Smart Operations Suzhou China

ISBN: (纸本)9798350316339

This paper is concerned with the stabilization problem of unstable systems with mixed gain and phase perturbations, thence elaborating on the exact computation of optimal robustness margins. We focus on non-minimum phase plants that are stabilized by proportional and proportional-integral (PI) controllers. Specifically, for such systems with mixed perturbations, we first show that the computation of optimal gain margin constitutes a constrained optimization problem. It is proved that the maximum gain margin is attained at zero integral gain, and the boundary value of proportional gain can be determined exactly. Via the Bilherz criterion, we next demonstrate that the maximal phase margin of non-minimum phase systems subject to mixed perturbations is also achieved at zero integral gain. It turns out that the calculation of optimal phase margin amounts to solving a concave optimization problem. Finally, we find that proportional-integral control and proportional control promise the same expressions of optimum robustness margins. Our explicit results clearly characterize the well-established dependence of the maximum robustness margins and/or the optimal controller coefficients on the system's unstable pole, nonminimum phase zero as well as uncertain perturbations. © 2024 IEEE.

关键词： Proportional control systems

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design of A Quad-Band Waveguide Filter with Compact Size and Large Frequency Ratio 9

Design of A Quad-Band Waveguide Filter with Compact Size and...

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9th IEEE MTT-S International Wireless Symposium, IWS 2022

作者： Guo, Zai-Cheng Chen, Longji Zhang, Gang School of Electrical and Automation Engineering Nanjing Normal University Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing China

ISBN: (数字)9781665481977

ISBN: (纸本)9781665481977

In this paper, a quad-band waveguide filter with 200 MHz bandwidth for each passband is introduced. The maximum frequency ratio could reach 1.5 for the center frequency by adjusting the length width ratio of reasonable cavities. The distinctive feature of the filter is that thin rectangular cavities are stacked parallel to the input/output ports, forming a multi-layer structure. As there is no inter-layer coupling, each layer does not affect each other, and each layer can independently control the filtering response of a passband. Additionally, one transmission zero (TZ) is generated between any two adjacent passbands, which is conducive to enhancing the attenuation between pass bands. The Simulated result reasonably supports the validity of the proposed filter. © 2022 IEEE.

关键词： Waveguide filters

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design of a 3d-Printed Compact Coaxial Sleeve Bandpass Filter with High Harmonic Suppression Characteristic

Design of a 3D-Printed Compact Coaxial Sleeve Bandpass Filte...

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International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE)

作者： Zhanzhi Liu Jinxuan Ni Hengrui Jiang Chenxin Ma Jiquan Yang Gang Zhang Jiangsu key Laboratory of 3D Printing Equipment and Manufacturing Nanjing Normal University Nanjing Jiangsu China

ISBN: (数字)9798331533922

ISBN: (纸本)9798331533939

This article proposes a miniaturized coaxial sleeve structure manufactured based on 3d printing technology for the first time. The resonant cavity consists of an inner column and a sleeve that is very close to each other. By reducing the distance between them, better harmonic suppression performance can be achieved without changing the volume. To verify these characteristics, a second-order single passband filter is designed, and the selectivity of the filter is improved by setting external coupling ports. The harmonic suppression multiple reaches 9.5 times and integrated printing is achieved by adding non-radiating slots. The 3d printing process can achieve the advantages of high precision and lightweight, ensuring good performance of the filter. Good agreements between the simulated results and the measured ones verify the feasibility of the proposed design method.

关键词： Band-pass filters Microwave antennas Wireless communication Harmonics suppression design methodology Three-dimensional printing Propagation losses Manufacturing Microwave filters Power harmonic filters

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Low-Loss dual-Wideband Circularly-Polarized Antenna With Using Loading technology

Low-Loss Dual-Wideband Circularly-Polarized Antenna With Usi...

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Wireless Sensing Technologies and applications (IWSA), IEEE International Workshop on

作者： Su-Chuan Qian Xuan Li Jie Tian Chen-Ji Zhao Jing-Yi Zhang Gang Zhang Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing Nanjing Normal University Nanjing China

ISBN: (数字)9798331505837

ISBN: (纸本)9798331505844

A millimeter-wave novel loading method to realize dual-wideband circularly-polarized (CP) performance based on a low-loss waveguide radiating antenna is proposed in this paper. The band-notching and CP characteristics can be achieved respectively by the simple loadings of non-radiating grooves and radiating stubs, while good impedance-matching is also achieved in a wide range. It can be seen from the simulated results that the proposed dual-wideband circularly-polarized antenna has the impedance bandwidths of 37% (25.3~34GHz) and 7.8% (37.49~39.77 GHz), and 3 dB axial ratio (AR) bandwidths of 29.6% and 5.95% in the lower- and higher-bands. Since the position of the introduced notch can be independently controlled by adjustable parameters, the bandwidth of the two frequency bands can be adjusted according to different applications. Besides, the simulated gains at 28 GHz and 38 GHz are 7.6 dBi and 6.9 dBi, respectively.

关键词： Wireless communication Wireless sensor networks Loading Millimeter wave technology Bandwidth Sensors Impedance Loaded antennas Gain Frequency control

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Compact Planar Wideband dual-Band Omnidirectional Antenna with Adjustable Slot Loadings

Compact Planar Wideband Dual-Band Omnidirectional Antenna wi...

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Asia-Pacific Conference on Microwave

作者： Jing-Yi Zhang Su-Chuan Qian Hao Yu Gang Zhang Wan-Chun Tang Ji-Quan Yang Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing Nanjing Normal University Nanjing China

ISBN: (数字)9798350363548

ISBN: (纸本)9798350363555

Omnidirectional antennas are widely used in wireless communication due to their full coverage of radiation and reception in the horizontal direction. In this paper, a planar wide annular slot omnidirectional antenna with microstrip line coupling excitation is proposed. On this basis, a compact notch slot structure is loaded to further introduce a notch to achieve dual-band performance. Through the full-wave software simulation verification, it can be obtained that the dual-band application example of the scheme can achieve wide operating bandwidths of about 38 % in each band, and good omnidirectional performance can also be realized in the horizontal plane.

关键词： Microwave antennas Wireless communication Slot antennas Transmitting antennas Loading dual band Omnidirectional antennas Aperture antennas Software Wideband

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