A5101735583- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Metamaterials and Metasurfaces Applications
- Ion-surface interactions and analysis
- Microwave Engineering and Waveguides
- Structural Health Monitoring Techniques
- Acoustic Wave Phenomena Research
- Silicone and Siloxane Chemistry
- Aerodynamics and Acoustics in Jet Flows
- Structural Analysis and Optimization
- Polymer Nanocomposite Synthesis and Irradiation
- Advanced Memory and Neural Computing
- Space Satellite Systems and Control
- Bluetooth and Wireless Communication Technologies
- Fluid Dynamics and Turbulent Flows
- Electromagnetic wave absorption materials
- Radiation Effects in Electronics
- Manufacturing Process and Optimization
Nanjing University of Aeronautics and Astronautics
2023
Shanxi University
2020-2021
Beihang University
2002
A planar monopole loaded with composite right/left-handed transmission line (CRLH-TL) for broadband LTE mobile phone is presented. The CRLH-TL a propagation constant of zero added to widen the input impedance bandwidth antenna. proposed antenna covers LTE700/2500/GSM850/900/1800/1900/UMTS2100 and WLAN2400 bands. Impedance bandwidths VSWR < 2:5 (S11 i7dB) ranging from 675 1010MHz 1690 2550MHz are obtained. size 60£16£1mm 3 which smaller than most antennas. Detailed design considerations...
In this letter, a multibeam antenna based on metasurface (MS) is proposed. By employing the partially reflecting defected MS as radiator, taking port 1 an example, beam with multiple sidelobes focused in direction of (3°, 33°) and peak gain increases from 6.3 to 10.57 dBi. Also, narrow half-power beamwidth 31° obtained dimension 1.5λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × . When fed different ports separately, beams are...
A novel Quasi-Yagi antenna with low radar cross section (RCS) is proposed in this paper. By using arrow-shaped Koch dipoles as the driver and director cutting ground of antenna, RCS can be reduced operating band 5 GHz-8 GHz when incident wave perpendicular to plane. Wideband absorbing material (WRAM) frequency selective surface (FSS) devised replace metallic reflect plate reduce maximum radiation direction. The average reduction 3 GHz-12 8.0 dB. simulated measured results show that there a...
The space membrane structure has good application prospects in large spacecraft antenna, solar sail and baffle because it the advantages of low quality small folding volume. modal characteristics directly decide or to a extent affect surface accuracy maintenance vibration control structure. correctness analysis needs be verified by ground tests. Because is light flexible, air an important influence on its results, so very necessary carry out tests vacuum environment. In this paper, taking...
摘要: 为适应结构健康监测对模态分析高效和自动化的需求,自主工作模态分析(Automated operational modal analysis,AOMA)在近二十年已成为结构动力学领域的研究热点之一。自动鉴别并剔除模态分析结果中的虚假模态,保留结构真实模态,是AOMA的核心和难点。现有AOMA方法可分为三类:①聚类法,核心是基于聚类算法自动挑选稳定图中的稳定模态作为真实模态,是目前的主流方法。②峰值提取法,自动挑选由真实模态引起的响应功率谱密度函数曲线或其奇异值曲线的峰值。③深度学习法,利用神经网络将工作模态分析问题转化为图像目标检测或时序分析问题。重点分析了三类方法的核心思想、分析流程及各自的特点,介绍了AOMA方法在工业软件及工程结构中的应用案例,最后阐明AOMA应用中应注意的问题及发展趋势。
In this paper, a new method to design compact wideband circularly polarized antenna based on complementary circular structure is proposed, and the rule explored. The consists of 3/4 ring patch nearly 1/4 arched slot etched ground plane. will generate horizontally vertically electric field E <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">φ</sub> xmlns:xlink="http://www.w3.org/1999/xlink">θ</sub> , respectively. When radius ratio close 0.8, can...
In this paper, a dual-frequency dual-beam antenna loaded with metasurface is proposed. Firstly, the feeding unit composed of two printed dipole used to provide excitation. And then, by loading periodically arranged square rings, beams steered different directions are realized and wider working frequency bands obtained. At same time, beam gains improved. The results show that resonant frequencies at 57 GHz 66 GHz, corresponding maximum radiation pointing (φ,θ) = (164°, 90°), (196°, 90°) (φ,...
A four-beam antenna loaded with metasurface (MS) is proposed. It contains two parts, the feeding element and MS. Among them, unit composed of a microstrip line an etched gap on ground plane used to provide excitation. And MS consists periodically arranged square patches, which are achieve beam deflection improve directivity. The results show that resonant frequency at 7.0 GHz, maximum radiation pointing (φ, θ) = (+7°, 44°), (+97°, (+187°, ( +277°, as well gain can reach 9.3 dBi.