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Wideband circular-polarized transmitarray for generating a high-purity vortex beam Correspondence

Liangjie QIU, Xiuping LI, Zihang QI, Wenyu ZHAO, Yuhan HUANG,xpli@bupt.edu.cn

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 6,   Pages 927-934 doi: 10.1631/FITEE.2200539

Abstract: In this correspondence, a wideband circular-polarized (CP) transmitarray (TA) in the Ka-band is presented for generating a high-purity vortex beam. The proposed element is composed of two identical combinations separated by an air layer. The subwavelength structure and double-resonance characteristics ensure the stable phase shift of the element within the 1-dB transmission bandwidth of 28.4%. A square aperture TA fed by a horn antenna is fabricated and measured. Owing to the honeycomb arrangement of elements, the mode purity of l​​=​​−1 is >0.93 in a wide band from 28.5 to 38 GHz. The measured peak gain is 22.3 dBic, and the 3-dB axial ratio bandwidth is 27.6%. The performance of the proposed antenna demonstrates its potential for high-capacity wireless communication and high-quality radar imaging.

Keywords： 轨道角动量；涡旋波束；透射阵；宽带；高纯度    

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Modeling and performance analysis of OAM-GSM millimeter-wave wireless communication systems

Qi Zhang, Xusheng Xiong, Qiang Li, Tao Han, Yi Zhong,qiqiz@hust.edu.cn,xiongxusheng@hust.edu.cn,qli_patrick@hust.edu.cn,hantao@hust.edu.cn,yzhong@hust.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 4,   Pages 527-547 doi: 10.1631/FITEE.2000444

Abstract: In recent years, the conventional degrees of freedom in frequency and time have been fully used. It is difficult to further improve the performance of communication systems with such degrees of freedom. , which provides a new degree of freedom for millimeter-wave (mmWave) wireless communication systems, has been recognized as a key enabling technique for future mobile communication networks. By combining OAM beams that have theoretically infinite and mutually orthogonal states with the strategy, a new OAM-GSM mmWave wireless communication system is designed in this paper. A model of the OAM-GSM system is established based on channel flip precoding. The , , and BER of the proposed OAM-GSM mmWave wireless communication system are simulated. Numerical results show that, compared with traditional GSM systems, the OAM-GSM system has more complex transmission and reception mechanisms but the and maximum achievable are increased by 80% and 54%, respectively, and the BER drops by 91.5%.

Keywords： 轨道角动量；广义空间调制；毫米波通信；信道容量；能量效率；误比特率    

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Independent Innovation in the Rejuvenation of Chinese Soybean Processing

Li Ronghe,Jiang Haokui

Strategic Study of CAE 2006, Volume 8, Issue 10,   Pages 80-84

Abstract:

To rejuvenate Chinese soybean production,this paper puts forward some independently innovative soybean processing technologies, including： 1 ) The method to extract albumen, short peptide, nucleic acid, isoflavone, saponins, and oligosaccharide from soybean meal at high and low temperature; 2) The method to extract compound soybean functional gene from defatted soybean meal at high and low temperature. These two methods target at “high-temperature soybean meal”.which is the byproduct of lipid industry. The extracted products include： 1) High-purity soybean oligopeptide (albumen content≥92% ; NSI value 100% ; solubility 100% ) ;2) High-purity soybean isoflavone (total isoflavone content ≥92% ：G:D≥8:1);3) Soybean composite factors.

Keywords： soybean processing     high-purity soybean oligopeptide     high-purity soybean isoflavone     soybean composite factors    

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Dot-shaped beamforming analysis of subarray-based sin-FDA Research Article

Bo Wang, Jun-wei Xie, Jing Zhang, Jia-ang Ge,wb_wangbo1991@163.com

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 10,   Pages 1429-1444 doi: 10.1631/FITEE.1800722

Abstract: Phased array (PA) radar is one of the most popular types of radar. In contrast to PA, the (FDA) is a potential solution to suppress range-related interference because of its time-range-angle-dependent beampattern. However, the range-angle coupling inherent in the FDA transmit beampattern may degrade the output signal-to-interference-plus-noise ratio (SINR). We propose a method based on the analyzed four subarray-based FDAs and subarray-based planar FDAs using a sinusoidally increasing frequency offset with elements transmitting at multiple frequencies. The numerical results show that the proposed approach outperforms the existing log-FDA with logarithmical frequency offset in transmit energy focus, sidelobe suppression, and array resolution. Comparative simulation results validate the effectiveness of the proposed method.

Keywords： 频率分集阵列；子阵频率分集阵列；解耦；点状波束形成    

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A review of optically induced rotation Review Article

Qi ZHU, Nan LI, Heming SU, Wenqiang LI, Huizhu HU,huhuizhu2000@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 2,   Pages 171-185 doi: 10.1631/FITEE.2000338

Abstract: The optical rotation technique arose in the 1990s. brought an ideal platform for research on the of laser beams. For decades, the optical rotation technique has been widely applied in laboratory optical manipulation and the fields of biology and optofluidics. Recently, it has attracted much attention for its potential in the classical and quantum regimes. In this work, we review the progress of experiments and applications of . First, we introduce the basic exploration of . Then, we cover the development and application of optical rotation induced by orbital , and the spin is presented. Finally, we elaborate on recent applications of the optical rotation technique in high vacuum. As precise optical manipulation in a liquid medium enters its maturity, s in high vacuum open a new path for the high-speed .

Keywords： Optical tweezer     Optically induced rotation     Angular momentum     Micro-rotor    

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Optimal design of a large dual-polarization microstrip reflectarray with China-coverage patterns for satellite communications Research Articles

Gang ZHAO, Yong-chang JIAO, Guan-tao CHEN

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1,   Pages 159-173 doi: 10.1631/FITEE.1900496

Abstract: A large dual-polarization microstrip reflectarray with China-coverage patterns in two operating bands is designed. To sufficiently compensate for the spatial phase delay differences in two operating bands separately, a three-layer rectangular patch element is addressed, which is suitable for the large dual-polarization reflectarray. Due to the complexly shaped areas and high gain requirements, there are more than 25 000 elements in the reflectarray, making it difficult to design, due to more than 150 000 optimization variables. First, the discrete fast Fourier transform (DFFT) and the inverse DFFT are used to establish a one-to-one relationship between the aperture distribution and the far field, which lays a foundation for optimizing the shaped-beam reflectarray. The intersection approach, based on the alternating projection, is used to obtain the desired reflection phases of all the elements at some sample frequencies, and a new method for producing a suitable initial solution is proposed to avoid undesired local minima. To validate the design method, a dual-polarization shaped-beam reflectarray with 7569 elements is fabricated and measured. The measurement results are in reasonable agreement with the simulation ones. Then, for the large broadband reflectarray with the minimum differential spatial phase delays in the operating band, an approach for determining the optimal position of the feed is discussed. To simultaneously find optimal dimensions of each element in two orthogonal directions, we establish a new optimization model, which is solved by the regular polyhedron method. Finally, a dual-band dual-polarization microstrip reflectarray with 25 305 elements is designed to cover the continent of China. Simulation results show that patterns of the reflectarray meet the China-coverage requirements in two operating bands, and that the proposed optimization method for designing large reflectarrays with complexly shaped patterns is reliable and efficient.

Keywords： Reflectarray     Dual-polarization     Shaped beam     Phase-only synthesis    

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Nanobubble Dynamics in Aqueous Surfactant Solutions Studied by Liquid-Phase Transmission Electron Microscopy Letter

Yuna Bae, Sungsu Kang a,b, Byung Hyo Kim, Kitaek Lim, Sungho Jeon, Sangdeok Shim, Won Chul Lee, Jungwon Park

Engineering 2021, Volume 7, Issue 5,   Pages 630-635 doi: 10.1016/j.eng.2021.02.006

Abstract:

Nanobubbles have attracted considerable attention in various industrial applications due to their exceptionally long lifetime and their potential as carriers at the nanoscale. The stability and physiochemical properties of nanobubbles are highly sensitive to the presence of surfactants that can lower their surface tension or improve their electrostatic stabilization. Herein, we report real-time observations of the dynamic behaviors of nanobubbles in the presence of soluble surfactants. Using liquid-phase transmission electron microscopy (TEM) with multi-chamber graphene liquid cells, bulk nanobubbles and surface nanobubbles were observed in the same imaging condition. Our direct observations of nanobubbles indicate that stable gas transport frequently occurs without interfaces merging, while a narrow distance is maintained between the interfaces of interacting surfactant-laden nanobubbles. Our results also elucidate that the interface curvature of nanobubbles is an important factor that determines their interfacial stability.

Keywords： Nanobubbles     In situ TEM     Liquid-phase TEM     Surfactant    

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Research on Planning & Evaluation for Track Traffic.Under China´s Sustainable Development Strategy

Wu Xiaoping,Chen Xiufang

Strategic Study of CAE 2003, Volume 5, Issue 10,   Pages 88-94

Abstract:

The paper advances some basic problems of planning & evaluating for track traffic in the process of putting sustainable development strategy in to practice and stresses the study of planning and evaluating method system for track traffic and environment strategy. Summaries and main creative points presented in the thesis are followed：①The changes of track traffic planning objects caused by the concept of sustainable development are analyzed;② The theory & method of track traffic planning optimal decision making is set up ;③ Environment impact assessment for track traffic planning is advanced; ④ Urban mass transit network planning is studied; ⑤Planning of the alignment optimization of dedicated passenger line and high speed railway line is studied;⑥ An overall evaluation index system for sustainable development of track traffic planning is established; ⑦The track traffic capacity building for sustainable development is studied. Further more, the paper verifies the effect of the method and models with empirical studies. The corresponding application software is realized to provide information service and decision-making support to track traffic planning for putting theory into practice.

Keywords： track traffic     urban mass transit     intercity rail system     sustainable development     planning     evaluation    

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Deformation monitoring and assessment technology for substructure of unballasted track on railway passenger dedicated line

Li Mingling

Strategic Study of CAE 2009, Volume 11, Issue 1,   Pages 48-59

Abstract:

The criterion for residual deformation of Substructure of unballasted track on railway passenger dedicated line is extremely strict in order to satisfy the safety and comfort requirements of the high-speed train. Based on new Wuhan(Guangzhou railway passenger dedicated line engineering practice,this paper introuduces the key technologies for the deformation monitoring, data management and analysis system, the prediction method and assessment criterion are put forward to determine the reasonable time of unballasted track laying to guarantee the quality of unballasted track. Some advice provide reference for the ongoing unballasted track on railway passenger dedicated line construction.

Keywords： unballasted track     deformation monitoring     analysis and assessment     condiction for unballasted track laying    

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Technology Development of Electric Traction Rail Traffic

Liu Youmei

Strategic Study of CAE 2000, Volume 2, Issue 10,   Pages 51-55

Abstract:

Traffic plays a pivotal role in the social economy operation. Rail traffic is alwys the principal part of traffic carrying trade in China. Electric traction has become the development orientation of rail traffic traction power. This paper, proceeding from the technology advantage of electric traction rail traffic, summarizes the development trend of electric traction rail traffic abroad and the development course of that at home, and puts forward the technology prospect of developing electric traction rail traffic in China.

Keywords： electric traction     rail traffic     development     prospect    

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Discussion on urban rail transit’s joint and development

Yan Ping

Strategic Study of CAE 2009, Volume 11, Issue 1,   Pages 92-96

Abstract:

Urban rail transit construction in our country is now stepping into a quickly developing period. Based upon urban rail transit planning of Beijing, this article analyzes questions existing in urban rail transit planning, construction and management. Using international metropolis's urban rail transit planning, construction and management experience for reference, the article brings forward optimized countermeasures on building synthesized harmonizing mechanism, perfecting urban rail transit planning and creating synthesized communication hinges, as well as giving concrete suggestions on urban rail transit's transfer and joint by utilizing state railway resources.

Keywords： urban rail transit     joint and development     adjustment suggestions    

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Correspondence: Monopulse transmitarray antenna fed by aperture-coupled microstrip structure Correspondence

Na KOU, Shixing YU, Zhao DING, Zhengping ZHANG,nkou@gzu.edu.cn,sxyu1@gzu.edu.cn,zding@gzu.edu.cn,zpzhang@gzu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 3,   Pages 502-510 doi: 10.1631/FITEE.2000547

Abstract: Monopulse technique, also known as the simultaneous beam comparison method, is used mainly to measure the direction of arrival (DOA) (Sherman and Barton, 2011). Before the advent of monopulse technology, the method most widely used in radar direction finding was the lobe-switching technique (sequential lobing) (Lo, 1999). Compared with the sequential lobing method, the monopulse antenna can obtain information such as the pitch angle, azimuth angle, and distance of the target in a single pulse period (Vazquez-Roy et al., 2019). Due to the need for higher accuracy of angle measurement, the monopulse technique has been widely applied in SOTM missile guidance (Roy et al., 2019). When a monopulse system is working, multiple independent channels are adopted to receive signals reflected by targets at the same time. Then signals enter the comparator and finally the distance and angle information of targets can be obtained. There are three main types of monopulse antennas: lenses, reflectors, and arrays. A dielectric lens is generally a convex lens (Raman et al., 1998), which is difficult to manufacture due to its curved shape, high volume, and large mass. For common reflectors such as dish antennas, the feed and supporting structure are in front of the aperture, so a shielding effect will result in energy loss, sidelobe increase, and angle measurement error (Kou and Cheng, 2019). A more effective reflector is the Cassegrain antenna, which is more compact with dual reflectors (Zheng et al., 2016, 2017). However, the Cassegrain antenna has the problem of shielding effect caused by a secondary reflector and support rods. With growing demand for low cost and lightweight monopulse antennas in modern radar and telecommunications systems, array antennas are increasingly applied in monopulse antennas due to their characteristics of high gain and easy control of the beam direction. A typical example is the waveguide slot array, which has the advantages of low loss, low sidelobe level, and no aperture shielding problem (Vosoogh et al., 2018). The microstrip has attracted much attention in monopulse antennas because of its advantages of low profile, simple structure, and low cost (Yu et al., 2009; Kumar and Kumar, 2018). However, monopulse microstrip array antennas usually have a complex feed network, which often makes them large and expensive. In addition, substrate integrated waveguides (SIWs) (Cao et al., 2017; Zhu et al., 2018; Liu et al., 2019; Yang et al., 2019) and leaky wave antennas (LWAs) (Poveda-García et al., 2019) have been applied in monopulse antennas, with good results. Recently, reflectarrays have been proposed for use in monopulse antennas, and have shown good performance (Zhao et al., 2017, 2018). As an alternative to reflectarrays, transmitarrays not only have the advantages of reflectarrays, but also have no shielding effect from the feeds. Di Palma et al. (2016) proposed a 400-element reconfigurable transmitarray antenna to synthesize monopulse radiation patterns. However, the sum and difference patterns generated by the reconfigurable transmitarray antenna, which is controlled electronically by switches instead of by a SUM-DIFF comparator, are in time division.

Keywords： 孔径耦合；单脉冲天线；微带；透射阵列    

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The general planning scenarios of electromagnetic rail launch system

Zhai Lipeng, Feng Junwen, Wang Huating, Bai Ju

Strategic Study of CAE 2008, Volume 10, Issue 8,   Pages 45-50

Abstract:

In the analysis of the electromagnetic rail launch system.,this paper discusses the general developmental strategy of electromagnetic rail launch system based on the scenario planning theory. Through analyzing the world current situation and the key technical variables of electromagnetic orbit launch system, the paper conceives the three developmental strategy models of future electromagnetic rail launch system and proposes the focus of development strategy.

Keywords： electromagnetic rail launch system     scenario planning     development strategy    

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Influence and Control Strategy for Local Settlement for High-Speed Railway Infrastructure

Gaoliang Kang

Engineering 2016, Volume 2, Issue 3,   Pages 374-379 doi: 10.1016/J.ENG.2016.03.014

Abstract:

This paper discusses the main impact factors of the local settlement and differential settlement of high-speed railway lines. The analysis results show that groundwater exploitation is the direct cause of differential settlement. Based on the study of ballastless track additional load and of vehicle, track, and bridge dynamic responses under different differential settlements, a control standard of differential settlement during operation is proposed preliminarily.

Keywords： Local settlement     Differential settlement     Additional load of ballastless track     Vehicle and track dynamics    

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Title Author Date Type Operation

Wideband circular-polarized transmitarray for generating a high-purity vortex beam

Liangjie QIU, Xiuping LI, Zihang QI, Wenyu ZHAO, Yuhan HUANG,xpli@bupt.edu.cn

Journal Article

Modeling and performance analysis of OAM-GSM millimeter-wave wireless communication systems

Qi Zhang, Xusheng Xiong, Qiang Li, Tao Han, Yi Zhong,qiqiz@hust.edu.cn,xiongxusheng@hust.edu.cn,qli_patrick@hust.edu.cn,hantao@hust.edu.cn,yzhong@hust.edu.cn

Journal Article

Independent Innovation in the Rejuvenation of Chinese Soybean Processing

Li Ronghe,Jiang Haokui

Journal Article

Tasimati Yusufu: Orbital Angular Momentum Controllable Mid Infrared Vortex Optical Parametric Oscillator (2019-10-13)

塔西买提•玉苏甫(高级职称)

20 Jan 2021

Conference Videos

Dot-shaped beamforming analysis of subarray-based sin-FDA

Bo Wang, Jun-wei Xie, Jing Zhang, Jia-ang Ge,wb_wangbo1991@163.com

Journal Article

A review of optically induced rotation

Qi ZHU, Nan LI, Heming SU, Wenqiang LI, Huizhu HU,huhuizhu2000@zju.edu.cn

Journal Article

Optimal design of a large dual-polarization microstrip reflectarray with China-coverage patterns for satellite communications

Gang ZHAO, Yong-chang JIAO, Guan-tao CHEN

Journal Article

Nanobubble Dynamics in Aqueous Surfactant Solutions Studied by Liquid-Phase Transmission Electron Microscopy

Yuna Bae, Sungsu Kang a,b, Byung Hyo Kim, Kitaek Lim, Sungho Jeon, Sangdeok Shim, Won Chul Lee, Jungwon Park

Journal Article

Research on Planning & Evaluation for Track Traffic.Under China´s Sustainable Development Strategy

Wu Xiaoping,Chen Xiufang

Journal Article

Deformation monitoring and assessment technology for substructure of unballasted track on railway passenger dedicated line

Li Mingling

Journal Article

Technology Development of Electric Traction Rail Traffic

Liu Youmei

Journal Article

Discussion on urban rail transit’s joint and development

Yan Ping

Journal Article

Correspondence: Monopulse transmitarray antenna fed by aperture-coupled microstrip structure

Na KOU, Shixing YU, Zhao DING, Zhengping ZHANG,nkou@gzu.edu.cn,sxyu1@gzu.edu.cn,zding@gzu.edu.cn,zpzhang@gzu.edu.cn

Journal Article

The general planning scenarios of electromagnetic rail launch system

Zhai Lipeng, Feng Junwen, Wang Huating, Bai Ju

Journal Article

Influence and Control Strategy for Local Settlement for High-Speed Railway Infrastructure

Gaoliang Kang

Journal Article