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A Compound THz Meta-surface Absorber with Polarization Insensitivity and Angular Stability

A Compound THz Meta-surface Absorber with Polarization Insen...

引用

IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)

作者： Kai Wang Hailiang Zhu Ganyu Liu Jinchao Mou Pei Zheng Gao Wei Northwestern Polytechnical University School of Electronics and Information Xi'an Shaanxi CN Beijing Research Institute of Telemetry Beijing CN The National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing CN

In this paper, a wideband terahertz meta-surface absorber with ultra-thin thickness is proposed. The meta-surface unit cell is composed of four-square unit cells in two different sizes. The the absorption higher than 90% from 3.24 to 3.98THz is achieved which can be regarded as a perfect terahertz absorber. Due to the symmetrical layout of meta-surface unit cell, the absorption spectrum can be maintained for any linear polarized terahertz wave, and the absorptance can be kept higher than 80% while the incident angle increases before 45°. Furthermore, the thermal response is calculated to be 0.23 $\mathbf{K} \cdot{\mathbf{m}\mathbf{m}^{2}/ \upmu \mathbf{W}}$ that well suited the requirements of FPA detectors.

关键词： Sensitivity Absorption Layout Detectors Stability analysis Compounds Thermal stability

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Design of Non-uniform Flexible Meta-surface for Antenna Beam-steering 3

Design of Non-uniform Flexible Meta-surface for Antenna Beam...

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3rd IEEE International Conference on Electronic Information and Communication technology, ICEICT 2020

作者： Qiu, Yuwei Jiang, Zhiye Zheng, Pei School of Electronic Information Northwestern Polytechnical University Xi'an China National Key Laboratory of Science and Technology on Test Physics Numerical Mathematics Beijing China

ISBN: (纸本)9781728190457

Design of non-uniform flexible meta-surface for antenna beam-steering is presented in this paper. By properly tuning the dimensions of quasi-I-shaped unit cells on meta-surface, we propose a bi-layer meta-surface that can achieve beam deflection of up to 34°. Horn antenna is adopted as the feed antenna to illuminate the meta-surface which is printed on flexible plastic sheet. The meta-surface is fixed on the outside surface of horn antenna with an electric motor, making it possible to slide relative to the aperture of feed antenna. The horn antenna together with the meta-surface will work like a projector when operating, the main-beam of the horn antenna can be steered when different frames of the meta-surface cover the horn aperture and the steering range is ±34°•Radiation reconfigurable is thus achieved through a simple structure. Prototype will be fabricated in the following research. © 2020 IEEE.

关键词： Horn antennas

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Application of improved genetic ant colony optimization in radar resource interference allocation 5

Application of improved genetic ant colony optimization in r...

引用

IET International Radar Conference 2020, IET IRC 2020

作者： Liao, Yanping Guo, Wenyuan Hu, Li Guo, Wenyuan Information and Communication Engineering Department Harbin Engineering University Harbin China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China

ISBN: (纸本)9781839535635

Under the condition of limited interference resources, how to maximize the benefits of multiple jammers interfering with multiple radars has become a research hotspot. This paper has designed a reasonable interference evaluation method. Aiming at the disadvantages of genetic algorithm and ant colony optimization, made some improvements, and combined genetic methods and ant colony optimization, besides, a new crossover and mutation method based on constraints is proposed, which overcomes the shortcomings of invalid iteration of genetic algorithm and easy to fall into local optimal solution of ant colony optimization. Through simulation analysis, the fused algorithm can reach the optimal value within a short number of iterations, improving the utilization efficiency of the jammer. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Ant colony optimization

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Mechanically Beam-steering of Horn Antenna Using Non-uniform Flexible Meta-Surface 6

Mechanically Beam-steering of Horn Antenna Using Non-uniform...

引用

6th IEEE International Conference on Computer and Communications, ICCC 2020

作者： Jiang, Zhiye Zheng, Pei Qiu, Yuwei Zhu, Hailiang Ding, Chenyu Wei, Gao National Key Laboratory of Science and Technology on Test Physics Numerical Mathematics Beijing China School of Electronics and Information Northwestern Polytechnical University Xi'an Shaanxi China

ISBN: (纸本)9781728186351

Research on mechanically beam-steering of horn antenna using non-uniform meta-surface is presented in this paper. After optimizing the layout of quasi-I-shaped unit cell, we designed a flexible bi-layer meta-surface that can bring a main beam deflection of 40°. When the meta-surface is sliding along the long side of horn antenna, the main beam can be steered accordingly in a range of ±40°. A mechanically radiation reconfigurable antenna is thus achieved by a simple structure. Sliding of the meta-surface relative to the horn can be realized by a motor-driven conveyor belt when the prototype is fabricated in the following research. © 2020 IEEE.

关键词： Horn antennas

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Design and Simulation of a Planar Printed Slot Array Antenna

Design and Simulation of a Planar Printed Slot Array Antenna

引用

IEEE International Workshop on Electromagnetics, Applications and Student Innovation (iWEM)

作者： Shi Xiaofei Shi Jiaxin Liu Jiaqi Fang Zhongyi Wang Lei Song Lizhong Shandong Institute of Space Electronic Technology Yantai China School of Electronics and Information Engineering Harbin Institute of Technology Harbin China School of Information Science and Engineering Harbin Institute of Technology at Weihai Weihai China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing Institute of Space Long March Vehicle Beijing China Shandong Huayu Aerospace Technology Co. Ltd Yantai China

This paper designs an array antenna with a planar printed structure. The antenna element adopts a rectangular slot antenna, and the antenna element is excited by a T-shaped feeding structure. The microstrip power distribution network is used to feed the antenna radiator array with equal power. The microstrip power distribution network and slot radiator array are located on top and bottom of dielectric substrate, and the array antenna is implemented by use of the printed circuit technology. In order to improve the gain, a metal reflector ground is placed below the dielectric substrate. A planar printed slot array antenna working in X band is designed. The coaxial line is used to feed the array antenna at the bottom. The whole antenna structure is easy to feed and suitable for fabrication. The designed array antenna was numerically calculated using full wave electromagnetic simulation software. At a working frequency of 10.1GHz, the voltage standing wave ratio (VSWR) of the antenna is about 1.35, and the gain is about 21.46dB. The design of the antenna scheme can be used as a reference for the actual application of engineering.

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Motion design for a walking-promotion robot and an evaluation of the effects on walking motivation 16

Motion design for a walking-promotion robot and an evaluatio...

引用

16th International Conference on Ubiquitous Robots (UR)

作者： Matsushita, Yume Miki, Kenta Imazaike, Takuya Yamazoe, Hirotake Lee, Joo-Ho National Key Laboratory of Science & Technology on Test Physics & Numerical Mathematics Beijing China

ISBN: (纸本)9781728132327

Falls are one of the reasons why older people need to receive care. Walking training is effective for preventing older people from falling. Accordingly, various research related to walking training has been conducted. We aimed to introduce robots in walking training of older people, and we developed a walking-promotion robot. In this paper, we designed motions for promoting walking by older people and evaluated the effects on the participants motivation to walk and the impression of the robot conveyed by the robots motions. From the experimental results, we confirmed that a robot did affect the participants motivation to walk.

关键词： Legged locomotion Acceleration Robot motion Task analysis Training Turning"

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A multi-agent jamming decision-making method based on SP-HASAC

A multi-agent jamming decision-making method based on SP-HAS...

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IET International Radar Conference (IRC 2023)

作者： Jingpeng Gao Chen Shen Lu Gao Zhiye Jiang College of Information and Communication Engineering Harbin Engineering University Harbin People's Republic of China Beijing Institute of Electronic System Engineering Beijing People's Republic of China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing Institute of Space Long March Vehicle Beijing People's Republic of China

ISBN: (数字)9781837240982

In the study of the multi-UAV penetration mission decision method, the Heterogeneous Agent Soft Actor-Critic algorithm uses the HAML framework and the maximum entropy principle to enable UAVs to have stronger anti-jamming capability and exploration capability. However, it is difficult to accurately evaluate the action value of UAVs and the training stability is poor. To address this issue, this paper proposes a multi-agent based on the state prediction-HASAC (SP-HASAC) jamming decision method. Based on the idea of advantage function decomposition and environmental dynamics model, the state prediction network is designed to extract more abundant spatial information of penetration battlefield and achieve accurate evaluation of the action value of multi-UAV. Combining with the negative domain activation theory, the ReLU function is improved to realize the stable training of multi-UAV. The simulation results show that in the electronic penetration scenario of three UAVs against a single radar, the training convergence time of the proposed improved algorithm is reduced by 22% compared with the original algorithm. Three UAVs penetration to twice the burn-through distance still has more than 70% penetration success rate.

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A Fast Design Method for Ultra Broadband Absorbers Using RC Equivalent Circuit Model

A Fast Design Method for Ultra Broadband Absorbers Using RC ...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Xianglin Kong Lei Zhao Fengjun Wang Shengjun Zhang Yixiang Fu Xiaoyu Pang Xiaochun Liu Xiaopeng Shen School of Information and Control Engineering China University of Mining and Technology Xu Zhou CA China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematical Beijing China Key Laboratory of Aeronautical Science and Technology for High Performance Electromagnetic Window Jinan China School of Materials and Physics China University of Mining and Technology Xuzhou China

An accuracy and efficient approach is proposed to fast design ultra-wideband microwave absorbers. The RC equivalent circuit model of absorbers is established according to impedance matching and transmission line theory. The model is suitable for low and high-frequency absorbers composed of multilayer square high impendence surface (HIS) and air layers of impendence matching. Absorbers with different parameters can be fast designed by utilizing the proposed model and genetic algorithm. The reflection coefficient of RC circuit and full-simulation are in good agreement, both of them are lower than -10 dB within 2-18 GHz or 4-50 GHz (fractional bandwidth of 160% or 170.37%), with the total thickness close to the Rozanov limit. An absorber is fabricated and measured to further verify the accuracy of the model. The measured results have a good agreement with the RC circuit model, which indicates the proposed method is an efficient way for fast designing ultra-broadband thin absorbers using double-layer (or multilayer) square HIS.

关键词： Microwave measurement Atmospheric modeling Transmission line measurements Nonhomogeneous media Microwave theory and techniques Microwave circuits Frequency measurement

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Design of a Printed Monopole Array Antenna with the Simple Feeding Structure

Design of a Printed Monopole Array Antenna with the Simple F...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Shi Xiaofei Liu Yizhuo Liu Jiaqi Fang Yizhong Gao Zhiwei Wang Lei Song Lizhong Shandong Institute of Space Electronic Technology Yantai China School of Electronics and Information Engineering Harbin Institute of Technology Harbin China School of Information Science and Engineering Harbin Institute of Technology at Weihai Weihai China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing Institute of Space Long March Vehicle Beijing China School of Information Science and Technology Shijiazhuang Tiedao University Shijiazhuang China Shandong Huayu Aerospace Technology Co. Ltd Yantai China

This paper introduces an array antenna by use of printed monopole antennas as element. The designed array antenna consists of two layers of dielectric substrate and a metal reflective ground. The array antenna element adopts trapezoidal printed monopole antenna, and the element is fed by coplanar waveguide (CPW). The array antenna radiator is located on the top of the upper dielectric substrate, and the feeding microstrip power divider network is located on the bottom of the lower dielectric substrate. The antenna element radiator is vertically connected to the microstrip feeding power divider network in a coaxial-like manner. The whole structure of the antenna is simple, and the feeding structure is convenient, which makes it suitable for fabrication and assembly. A printed 4x4 monopole array antenna was designed and the relevant simulated results are provided. The simulation results show that at the 10GHz, the designed array antenna has a gain of approximately 12.73 dB and a return loss of approximately -11.75 dB. The antenna scheme discussed in this paper can provide technical reference for the design of planar printed array antennas.

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Adaptive-Correlation Back-Projection Imaging Algorithm for Ground Penetrating Radar in Complex Scenes

Adaptive-Correlation Back-Projection Imaging Algorithm for G...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Qianqi Dai Gao Lu Tao Jiang Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information Technology Harbin Engineering University Harbin China National Key Laboratory of Science and Technology on Test Physics and umerical Mathematics Beijing Institute of Space Long March Vehicle Beijing China

The current correlation back-projection algorithm can only deal with the imaging of objects at the same buried depth. However, for objects with different depths and different relative permittivity, the electromagnetic wave echo composition is complicated, there is no strong correlation between the time delays of the reflected echoes, the echo signal in the center of the detection area is used as a reference signal to perform consistent correlation processing, which will cause serious suppression. In this paper, an improved adaptive correlation algorithm was proposed. Firstly, the algorithm of maximum variance between clusters (OSTU) is used to extract the horizontal position and number of buried objects, and then the relevant parameters are adaptively adjusted according to the reflected energy and horizontal position of different targets. Finally, back-projection algorithm imaging is performed. Simulation experiments showed that the algorithm proposed in this paper can effectively improve the imaging effect, improve the detection probability of buried objects, and adapt to the variability of detection scenes.

关键词： Adaptation models Correlation Ground penetrating radar Delay effects Computational modeling Electromagnetic scattering Clustering algorithms

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