Lei Wang

Southeast University

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i-10 index

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Co-Authors

Christian Schuster

Universität Hamburg

George Goussetis

Heriot-Watt University

Qiang Cheng

Southeast University

Yu Jian Cheng

University of Electronic Science and Technology of China

Xiaoxing Yin

Southeast University

Michael Wulff

Universität Hamburg

Chaoyun Song

Shenzhen University

Jian Dang

Southeast University

Jianfeng Chen

Beijing University of Chemical Technology

Liang Wu

Southeast University

Cooperative Institutions

Southeast University

117

Chinese Academy of Sciences

University of Electronic Science and Technology of China

University of Chinese Academy of Sciences

State Key Laboratory of Millimeter Waves

Zhejiang University

Nanjing University

Tsinghua University

Xi'an Jiaotong University

Jilin University

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Optimization of Light Field for Generation of Vortex Knot

Chinese Physics Letters (2022)

Song Wang Lei Wang Furong Zhang Ling‐Jun Kong

The theory of knots and links focuses on the embedding mode of one or several closed curves in three-dimensional Euclidean space. In an electromagnetic field system, all-optical knots or links composed of phase or polarization singularities have been verified theoretically and experimentally. Recent studies have shown that robust topological all-optical coding can be achieved by using optical knots and links. However, in the current design of optical knots and links based on phase or polarization singularities, the amplitude of light between adjacent singularities is relatively weak. This brings great pressure to detection of optical knots and links and limits their applications. Here, we propose a new optimization method in theory. Compared with the existing design methods, our design method improves the relative intensity distribution of light between adjacent singularities. We verify the feasibility of our design results in experiments. Our study reduces the detection difficulty of optical knots and links, and has a positive significance for promotion of applications of optical knots and links.

Optical vortex

Light Field

10.1088/0256-307x/39/10/104101

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Citations (3)

Blind Interference Alignment Scheme for Dynamic TDD Systems

Yuanhao Chen Liang Wu Zaichen Zhang Jian Dang Bingcheng Zhu

This paper proposes a multi-cell blind interference alignment (BIA) scheme to eliminate the cross-link interference in the dynamic time division duplex (TDD) wireless communication system. The proposed BIA scheme focuses on the interference between base stations. In the proposed BIA scheme, the transmitter does not need to know channel state information (CSI), and the implementation process is divided into two parts. In the first part, the interfering base station and the users of the interfered cell transmit signal vectors at the same time. In the second part, only the interfering base station transmits signal vectors, which is received by the interfered base station and is employed to eliminate the interference caused in the first part. The proposed scheme can eliminate interference efficiently and achieve a high degree of freedom (DoF).

Channel state information

Duplex (building)

Co-channel interference

SIGNAL (programming language)

10.1109/ictc55111.2022.9778505

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Citations (1)

Millimeter-Wave Uniform Amplitude SIW Series Power Divider for 2D Leaky-Wave Antenna Arrays

2022 16th European Conference on Antennas and Propagation (EuCAP) (2024)

Weiguang Song George Goussetis Lei Wang

This paper proposes a millimeter-wave uniform amplitude substrate integrated waveguide (SIW) series power divider for 2D leaky-wave antenna arrays, which is built by connecting 10 elaborately designed unit cells in series. The unit cell consists of an SIW to slot and microstrip line coupling structure, which can be further extended to a low-cost phase shifter by introducing varactors or other active components. Theoretical analysis is made firstly to specify the necessary conditions for uniform amplitude power division. Then, a short via is added to the unit cell to meet the admittance condition. A full wave simulation is conducted to extract the normalized admittance and transmission characteristics of the unit cell, which provides useful references for the design of geometric parameters. After the design of unit cells, a 1-to-10 SIW series power divider is implemented by connecting unit cells with aimed transmission characteristics. At last, comparisons are made between the uniform amplitude power divider and the non-uniform amplitude power divider to demonstrate the feasibility of the design method. The proposed uniform amplitude SIW series power divider for 2D leaky-wave antennas works between 24 GHz and 29 GHz, which is competitive for millimeter-wave communication and wireless power transfer systems.

Wilkinson power divider

Current divider

10.23919/eucap60739.2024.10500974

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Effect of cylinder spacing on reflection and propagation of substrate‐integrated waveguide

Microwave and Optical Technology Letters (2008)

Lei Wang Wenquan Che 王超 Wang Chao Yumei Chang Zhanxian Wang

Abstract The effects of cylinder spacing on the reflection and propagation of substrate‐integrated waveguide (SIW) are investigated in this article. The reflection and propagation characteristics of SIW are simulated with HFSS in cases of different cylinder spacings. The simulation results show that, the cylinder spacing of SIW has much flexibility of selection, the return loss and insertion loss can be kept almost unchanged, provided that the cylinder spacings W <λ/10. The propagation constants in cases of different cylinder spacing are calculated, little change can be observed if W <λ/10. In addition, the leakage losses of the SIW in case of different cylinder spacing is calculated, same conclusion can be observed, i.e., the leakage loss is relatively small if the cylinder spacing W <λ/10. This observation is interesting and useful for practical engineering design of SIW‐based circuits. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 604–608, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23171

HFSS

Leakage (economics)

Waveguide

Reflection loss

Return loss

Reflection

10.1002/mop.23171

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Citations (1)

Millimeter-Wave LTSA Array Fed by High-Order Modes With a Low Cross-Polarization Level and Relaxed Fabrication Tolerance

IEEE Transactions on Antennas and Propagation (2021)

Jianfeng Chen Wei Yuan Wen Xuan Tang Lei Wang Qiang Cheng

In this article, a

$1\times 12$

millimeter-wave (mmW) linearly tapered slot antenna (LTSA) array, fed by high-order waveguide modes, is introduced. Due to the antiphase characteristic between adjacent channels of a power divider based on the TE

${}_{2n,0}$

mode waveguide, the cross-polarized E-field components can cancel each other out in an endfire direction, even in the case of a relatively thick substrate. Moreover, the electric separations between the adjacent channels employed in a traditional substrate integrated waveguide (SIW) power divider can be removed without affecting the field distributions. This facilitates in improving robustness to avoid fabrication errors. Additionally, a general condition of generating a single high-order mode with symmetrical protection is outlined. By combining two antiphase TE ₃₀ mode waveguides, an equivalent TE ₆₀ mode waveguide with six identical output channels is realized. To feed a 12-element array, two equivalent TE ₆₀ mode waveguides are employed as an equivalent TE _12,0 mode-feeding network. Instead of the complex 1-to-

$n$

-way power divider and relatively thin substrate featured in previous works, the high-order mode-fed LTSA array introduced in this study is able to operate over 26.5–30 GHz with substrate height of 2 mm (

$0.19\lambda _{0}$

), yielding a cross-polarization level of less than −15 dB.

Turnstile

Waveguide

Extremely high frequency

10.1109/tap.2021.3083802

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Ultraviolet Band High Resolution Detection Applications with Magnetic Dipole Quasi-Bic Resonant Dielectric Metasurfaces

SSRN Electronic Journal (2022)

chen zhang Zhengtong Liu Zhenmin Chen Xiaomin Nie Chunyang Ma

We designed a ring-shaped metasurface based on diamond material response in ultraviolet band, and the BIC mode is obtained by breaking the symmetry of structural units. When the radiation rate of the magnetic dipole resonance of the BIC mode is equal to the dissipation loss only brought by the surface covering material, the interaction between light and matter is maximally enhanced. Reflected in the macroscopic measurement signal, the absorptivity of the film material is enhanced by an order of magnitude in this work. The simulation results show that there is a linear relationship between the resonant positions of the structure and the scaling factor S for structure sizes change. When the metasurface is covered with a single DNA film, the reflectivity of the metasurface and DNA system changes differently due to the absorption of DNA at 240 nm-340 nm wavelengths. The reflection information of the system is further converted into ultraviolet absorption of DNA. Then the multiple absorption positions forms absorption spectrum of DNA molecules. Arrange the different scaling factor metasurface pixels on a same substrate can obtain a specific absorption image. The difference absorptivity of DNA with wavelengths leads to the difference brightness and darkness metasurface pixels. Processed the image to gray color to be used as a specific fingerprint information of DNA. So, we realized calibration and analysis of DNA without spectrum in the ultraviolet band now. The metasurface device can effectively detect the contamination of DNA by other biomolecules such as RNA. This work has greatly significance to promote the application of metasurfaces in the field of biological detection, and it is expected to be applied in nucleic acid detection.

Ultraviolet

10.2139/ssrn.4223230

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Compact microstrip feedings with an elevated ground plane for thick folded SIW

Lei Wang Qi Wu J. R. Mosig

Folded substrate integrated waveguide (FSIW) has been proposed for further size reduction, while keeping the advantages of traditional SIW. FSIW-based horn antennas are very promising in millimeter wave applications. To improve the bandwidth and efficiency of such antennas, a thick substrate is preferred but the microstrip feeding line becomes unacceptly wide to obtain a reasonable impedance. This paper introduces compact microstrip feeding lines with elevated ground plane for thick FSIW. Arbitrary characteristic impedance can be achieved without increasing the width of the feeding line, which will be very useful for the integration with other millimeter circuit components.

Ground plane

Extremely high frequency

High impedance

10.1109/ursi-emts.2016.7571503

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COMPACT DUAL-MODE DGS RESONATORS AND FILTERS

Progress In Electromagnetics Research Letters (2011)

Lei Wang Guan Bo-ran

A novel and compact dual-mode defected ground structure (DGS) resonator is presented. Distinct characteristics of the proposed resonator are investigated. Using this type of resonator, a bandpass filter with the center frequency of 2.38GHz and the fractional bandwidth of 6.7% is simulated and fabricated. The results show that this filter not only has an inherent transmission zero near the passband, but also has a very wide upper stopband with rejection better than 20 dB up to about 12 GHz.

Dual mode

Mode (computer interface)

10.2528/pierl11060106

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Citations (17)

Gain enhanced H-plane gap SIW horn antenna with phase correction

European Conference on Antennas and Propagation (2015)

Lei Wang Marc Esquius-Morote Xiaoxing Yin J. R. Mosig

The electromagnetic field phase distribution in horns' apertures is affected by the horn flaring and is usually not uniform, resulting in a lower antenna gain. This paper presents an H-plane SIW horn antenna with the aperture phase corrected by some gaps on the H-plane metallic walls, to enhance the antenna gain. To achieve a better radiation and impedance matching, some planar tapered-ladder transitions are printed just after the horn aperture. Simulations in HFSS software, including a probe excitation, have shown good phase correction and hence increased gain, while also providing good impedance matching. The designed compact Ka-band antenna achieves an enhanced gain of 10.1 dBi at 34 GHz, and an impedance bandwidth of 4.33 GHz.

Horn antenna

HFSS

Antenna gain

Aperture (computer memory)

Source

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Citations (12)

Machining fixture layout optimization using particle swarm optimization algorithm

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2010)

Jianping Dou Xingsong Wang Lei Wang

Optimization of fixture layout (locator and clamp locations) is critical to reduce geometric error of the workpiece during machining process. In this paper, the application of particle swarm optimization (PSO) algorithm is presented to minimize the workpiece deformation in the machining region. A PSO based approach is developed to optimize fixture layout through integrating ANSYS parametric design language (APDL) of finite element analysis to compute the objective function for a given fixture layout. Particle library approach is used to decrease the total computation time. The computational experiment of 2D case shows that the numbers of function evaluations are decreased about 96%. Case study illustrates the effectiveness and efficiency of the PSO based optimization approach.

Fixture

Parametric design

Page layout

10.1117/12.885289

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Citations (13)