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Miniaturized Rotman lens with applications to wireless communication Research Articles

Bao-hua SUN, Qiu-yan LIANG, Gao-nan ZHOU

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1,   Pages 144-158 doi: 10.1631/FITEE.1900501

Abstract: Rotman lens is a type of beamforming network with many advantages, such as true-time delay characteristicRotman lens has been used in a wide range of applications in today’s wireless communication systems.However, the size of a conventional Rotman lens is considerably large.lens to reduce the size of the ports and hence the total area occupied by the Rotman lens.Using the proposed truncated ports with energy distribution slots, the size of the Rotman lens can be

Keywords： Rotman lens     Miniaturization     Multibeam     Beamformer     Wireless communication    

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Review of small aspheric glass lens molding technologies

Shaohui YIN,Hongpeng JIA,Guanhua ZHANG,Fengjun CHEN,Kejun ZHU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 1,   Pages 66-76 doi: 10.1007/s11465-017-0417-2

Abstract:

Aspheric lens can eliminate spherical aberrations, coma, astigmatism, field distortions, and otherThis type of lens can also reduce the loss of light energy and obtain high-quality images and opticaland high-efficiency manufacturing technology for machining small-diameter aspheric lens for industrialHowever, the residual stress and profile deviation of the glass lens are greatly affected by various, and lens molding.

Keywords： aspheric glass lens     mold-die manufacturing     lens molding     molding process simulation    

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Characterization of aerodynamic performance of wind-lens turbine using high-fidelity CFD simulations

Islam HASHEM, Aida A. HAFIZ, Mohamed H. MOHAMED

Frontiers in Energy 2022, Volume 16, Issue 4,   Pages 661-682 doi: 10.1007/s11708-020-0713-0

Abstract: Wind-lens turbines (WLTs) exhibit the prospect of a higher output power and more suitability for urbanThe wind-lens typically comprises a diffuser shroud coupled with a flange appended to the exit peripheryIn this paper, the aerodynamic performance of the wind-lens is computationally assessed using high-fidelitythat the proposed methodology could be able to precisely predict the aerodynamic behavior of the wind-lensThe results affirm that wind-lens with cycloidal profile yield an augmentation of about 58% increase

Keywords： shroud     diffuser-augmented wind turbine (DAWT)     Betz limit     aerodynamics     computational fluid dynamics (CFD)    

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Extended Hemispherical Lens and Its Applications in Millimeter Wave Focal Imaging Systems

Sun Zhongliang,Dou Wenbin

Strategic Study of CAE 2000, Volume 2, Issue 3,   Pages 42-47

Abstract: This paper analyzes extended hemispherical lens, which can be used in focal imaging.lens.of the lens is analyzed by using Stratton-Chu formula and ray tracing method.It will provide much information about the imaging performance of the lens.Furthermore, the lens can be used to couple with a quasi-optical system.

Keywords： millimeter waves     antennas     imaging     extended hemispherical lens    

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High-Speed Parallel Plasmonic Direct-Writing Nanolithography Using Metasurface-Based Plasmonic Lens Article

Yueqiang Hu, Ling Li, Rong Wang, Jian Song, Hongdong Wang, Huigao Duan, Jiaxin Ji, Yonggang Meng

Engineering 2021, Volume 7, Issue 11,   Pages 1623-1630 doi: 10.1016/j.eng.2020.08.019

Abstract: However, a smaller and steadier plasmonic nanogap, new scheme of plasmonic lens, and parallel processingA multi-stage metasurface-based polarization insensitive plasmonic lens is proposed to couple more power

Keywords： Nanofabrication     Surface plasmon polariton     Lithography     Plasmonic flying head     Plasmonic lens    

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A Numerical Convex Lens for the State-Discretized Modeling and Simulation of Megawatt Power Electronics Article

Bochen Shi, Zhengming Zhao, Yicheng Zhu, Zhujun Yu, Jiahe Ju

Engineering 2021, Volume 7, Issue 12,   Pages 1766-1777 doi: 10.1016/j.eng.2021.07.011

Abstract: To address this challenge, this paper proposes the numerical convex lens approach to achieve state-discretizedThe numerical convex lens approach leads to the highly efficient simulation of intricate GHSs across

Keywords： Generalized hybrid systems     Megawatt power electronics     Modeling and simulation     Numerical convex lens    

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Precision glass molding: Toward an optimal fabrication of optical lenses

Liangchi ZHANG,Weidong LIU

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 1,   Pages 3-17 doi: 10.1007/s11465-017-0408-3

Abstract: Such complexity often leads to residual stresses and shape distortion in a lens molded, causing unexpected

Keywords： precision glass molding     optical lens     constitutive modeling     optimization     manufacturing chain     Industry    

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millimeter-wave air-filled substrate-integrated waveguide crossover employing homogeneous cylindrical lens

耿淳,连继伟,丁大志

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 9,   Pages 1366-1374 doi: 10.1631/FITEE.2200454

Abstract: 提出一种利用嵌入式均匀柱面透镜设计交叉电桥的新方法。与传统交叉电桥设计相比，该方法在空气填充的基片集成波导交叉腔内引入一个均匀柱面透镜，将入射波导向指定方向。根据射线追踪法，引入的均匀柱面透镜可以在不提高加工复杂度和面积的前提下，有效束缚从输入端传输到输出端的电磁波。详细阐述了该方法的工作机理，并通过电场分布进一步予以验证。利用空气填充基片集成波导技术，研制了工作在毫米波频段的二、三、四通道交叉电桥，验证了所提方法的可行性。同时引入过渡结构，便于实验测量。研究发现二、三、四通道空气填充基片集成波导交叉电桥仿真带宽分别为33%、14%和10%，其核心尺寸分别为0.74,λ,×0.74,λ,、1.43,λ,×1.43,λ,和1.90,λ,×1.90,λ,。最后，为进一步阐述本文方法的优势，将其与公开文献中的类似方法进行了比较。
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Segmentation and focus-point location based on boundary analysis in forest canopy hemispherical photography Article

Jia-yin SONG,Wen-long SONG,Jian-ping HUANG,Liang-kuan ZHU

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 8,   Pages 741-749 doi: 10.1631/FITEE.1601169

Abstract: Analysis of forest canopy hemisphere images is one of the most important methods for measuring forest canopy structure parameters. In this study, our main focus was on using circular image region segmentation, which is the basis of forest canopy hemispherical photography. The boundary of a forest canopy hemisphere image was analyzed via histogram, rectangle, and Fourier descriptors. The image boundary characteristics were defined and obtained based on the following: (1) an edge model that contains three parts, i.e., step, ramp, and roof; (2) boundary points of discontinuity; (3) an edge that has a linear distribution of scattering points. On this basis, we proposed a segmentation method for the circular region in a forest canopy hemisphere image, fitting the circular boundary and computing the center and radius by the least squares method. The method was unrelated to the parameters of the image acquisition device. Hence, this study lays a foundation for automatically adjusting the parameters of high-performance image acquisition devices used in forest canopy hemispherical photography.

Keywords： Fisheye lens     Least squares method     Image segmentation     Ecology in image processing     Hemispherical photography    

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Wide-Angle Scanning Antennas for Millimeter-Wave 5G Applications Article

Raj Mittra, Abdelkhalek Nasri, Ravi Kumar Arya

Engineering 2022, Volume 11, Issue 4,   Pages 60-73 doi: 10.1016/j.eng.2021.10.017

Abstract: The first of these is a Luneburg lens, which is excited either by a 2D waveguide array or by a microstripThe first of these is a Luneburg lens, together with a feed array, designed to realize a wide-angle scan

Keywords： Luneburg lens     Scanning arrays     Millimeter-wave antennas     Switchable phase shifters     Reconfigurable metasurfaces    

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Performance enhancement for antipodal Vivaldi antenna modulated by a high-permittivity metasurface lens Research Article

Shaopeng Pan, Mingtuan Lin, Lin Qi, Pan Chen, Yang Feng, Gaosheng Li,Gaosheng7070@vip.163.com

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 12,   Pages 1551-1684 doi: 10.1631/FITEE.2100139

Abstract: The modulation effect of the lens on the electromagnetic wave is analyzed from the perspective of electric

Keywords： 对跖Vivaldi天线；超宽带；高介电常数；双极化；超表面透镜    

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Title Author Date Type Operation

Miniaturized Rotman lens with applications to wireless communication

Bao-hua SUN, Qiu-yan LIANG, Gao-nan ZHOU

Journal Article

Review of small aspheric glass lens molding technologies

Shaohui YIN,Hongpeng JIA,Guanhua ZHANG,Fengjun CHEN,Kejun ZHU

Journal Article

Characterization of aerodynamic performance of wind-lens turbine using high-fidelity CFD simulations

Islam HASHEM, Aida A. HAFIZ, Mohamed H. MOHAMED

Journal Article

Extended Hemispherical Lens and Its Applications in Millimeter Wave Focal Imaging Systems

Sun Zhongliang,Dou Wenbin

Journal Article

High-Speed Parallel Plasmonic Direct-Writing Nanolithography Using Metasurface-Based Plasmonic Lens

Yueqiang Hu, Ling Li, Rong Wang, Jian Song, Hongdong Wang, Huigao Duan, Jiaxin Ji, Yonggang Meng

Journal Article

A Numerical Convex Lens for the State-Discretized Modeling and Simulation of Megawatt Power Electronics

Bochen Shi, Zhengming Zhao, Yicheng Zhu, Zhujun Yu, Jiahe Ju

Journal Article

Precision glass molding: Toward an optimal fabrication of optical lenses

Liangchi ZHANG,Weidong LIU

Journal Article

millimeter-wave air-filled substrate-integrated waveguide crossover employing homogeneous cylindrical lens

耿淳,连继伟,丁大志

Journal Article

Segmentation and focus-point location based on boundary analysis in forest canopy hemispherical photography

Jia-yin SONG,Wen-long SONG,Jian-ping HUANG,Liang-kuan ZHU

Journal Article

Wide-Angle Scanning Antennas for Millimeter-Wave 5G Applications

Raj Mittra, Abdelkhalek Nasri, Ravi Kumar Arya

Journal Article

Performance enhancement for antipodal Vivaldi antenna modulated by a high-permittivity metasurface lens

Shaopeng Pan, Mingtuan Lin, Lin Qi, Pan Chen, Yang Feng, Gaosheng Li,Gaosheng7070@vip.163.com

Journal Article