Article
Engineering, Electrical & Electronic
Kunning Liu, Chunyu Zhao, Shi-Wei Qu, Yikai Chen, Jun Hu, Shiwen Yang
Summary: The letter introduces a 3-D printed multibeam spherical lens antenna with 2-D ultrawide-angle coverage, utilizing a two-layer spherical dielectric lens and a circularly polarized U-slot patch antenna. The 2-D beam scanning is achieved by switching multiple feed elements, leading to stable radiating beams with a coverage of 360 degrees in the azimuth plane and nearly 90 degrees in the elevation plane. Experimental results show an impedance bandwidth of 7.7 to 8.2 GHz and isolation of over 20 dB between adjacent feeds.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Computer Science, Information Systems
Nurhayati Nurhayati, Eko Setijadi, Alexandre Manicoba de Oliveira, Dayat Kurniawan, Mohd Najib Mohd Yasin
Summary: This paper presents a 1 x 2 MIMO of Palm Tree Coplanar Vivaldi Antenna with a frequency range of 0.5-4.5 GHz. Wideband antennas are required for some GPR applications, starting from a frequency below 1 GHz, to overcome high material loss and achieve deeper penetration. However, setting up MIMO antennas for increased gain is expensive due to their large size. When configuring MIMO antennas in the E-plane, there is uncertainty over which antenna model provides optimal performance in terms of various factors. Configuring E-plane MIMO antennas also leads to issues of mutual coupling and grating lobes.
Article
Multidisciplinary Sciences
Peiying Lin, Yuting Wu, Zhouyi Wu, Ruofan Zhuo, Jiangtao Huangfu
Summary: This study proposes an optically frequency-reconfigurable antenna with multiband characteristics using photodiodes. The antenna can be reconfigured at multiple low frequencies and remains stable at high frequencies. By illuminating different photodiodes, the antenna can switch between three narrowband modes. The antenna also has good working characteristics in specific frequency ranges, making it suitable for various applications.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Electrical & Electronic
Huanhuan Qi, Haiwen Liu, Le Chang
Summary: This paper proposes a dual-port wideband monopulse Vivaldi antenna that utilizes common mode and differential mode radiations. By introducing a metallic wedge in the center, the virtual magnetic wall effect is eliminated and the realistic electric wall fulfills the boundary condition for difference beam under common mode excitation. The desired sum and difference radiation patterns are achieved in a single Vivaldi antenna under differential mode and common mode excitations, respectively. Moreover, a notched band is introduced for interference suppression, and the notched frequency can be easily controlled. The measured results demonstrate good agreement with the simulated ones.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Huanhuan Qi, Haiwen Liu
Summary: This paper proposes a wideband high-gain Vivaldi antenna based on spoof surface plasmon polaritons (SSPP) metamaterial for radio astronomy application. The height of the SSPP structures fits the exponential function, resulting in the exponential spoof surface plasmon polaritons (ESSPP) metamaterial. With the exponential heights, the ESSPP metamaterial corrects the phase difference in a wide band, improving the gain in the frequency range from 3 GHz to 9 GHz. The proposed antenna exhibits stable radiation patterns with an average gain of 10.6 dBi.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Zhen Su, Kirill Klionovski, Hanguang Liao, Weiwei Li, Atif Shamim
Summary: Orientation-insensitive wireless devices are essential for stable and reliable communication in IoT applications. This research demonstrates that sloped dipoles on a 3-D structure can achieve maximum circular polarization coverage.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Computer Science, Information Systems
Henri Kahkonen, Juha Ala-Laurinaho, Ville Viikari
Summary: This study presents a modular dual-polarized Vivaldi antenna array design for the frequency range of 18-30 GHz. It consists of antenna and RF modules, allowing assembly of antenna arrays of various sizes and shapes. The experimental results confirm the feasibility and performance of the design.
Article
Telecommunications
Bazil Taha Ahmed, Alfonso Moreno Sanchez
Summary: This work designs and fabricates two types of Vivaldi MIMO antennas, a two ports band-reject Vivaldi MIMO antenna and a two ports band-reject Vivaldi MIMO antenna with a dielectric lens. Measurements show that both antennas have an experimental working band of 3-12 GHz with isolation between ports higher than 25 dB. The measured group delay shows low variation except in the filter band where it is higher. The MIMO antenna with a lens exhibits higher realized gain compared to the MIMO antenna without a lens.
WIRELESS PERSONAL COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Liwen Jing, Meng Li, Ross Murch
Summary: This article describes an improved method for designing compact and reconfigurable pixel antennas, which introduces diagonal connections between pixels to enhance their pattern steering capability. These connections increase the degrees of freedom available in the design process, resulting in improved performance and the ability for currents to cross each other in the antenna geometry. Simulation and measurement results demonstrate that these diagonal connections allow for beam steering over a wide range of angles and can increase antenna gains.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Materials Science, Multidisciplinary
Henridass Arun, Idayachandran Govindanarayanan
Summary: A semicircle-shaped circularly polarized bidirectional flexible antenna for X-band applications is proposed. The antenna utilizes a semicircle-shaped radiator and a flexible woollen felt substrate. A slant rectangular slot is introduced in the radiator for better performance in multipath fading environment. The prototype antenna has been fabricated and shows good performance for RFID and other wearable applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Computer Science, Information Systems
Raza Ullah, Sadiq Ullah, Farooq Faisal, Rizwan Ullah, Dong-you Choi, Ashfaq Ahmad, Babar Kamal
Summary: In this study, an antipodal Vivaldi antenna was designed for 5th generation (5G) mobile communication and Ku-band applications. The antenna has three layers and compact size. It covers multiple frequency bands, shows high efficiency, and is suitable for 5G communication and radar applications.
Article
Physics, Applied
Houyuan Cheng, Helin Yang, Jiong Wu, Yujun Li, Lina Hua, Yuejie Yang
Summary: In this paper, a novel orthogonal dual-beam Vivaldi antenna loaded with metamaterial lenses (MLs) is designed. Two water-based absorbers (WBAs) containers are used to selectively control the antenna radiation. This work has potential applications in 5G communication systems and point-to-point communication systems.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Narayana Rao Palepu, Jayendra Kumar
Summary: In this work, a novel series-feed 4-element antenna array is introduced, which provides wider bandwidth, improved co and cross-polarization isolation, and higher gain. Three different technologies were implemented to achieve the research objectives of miniaturization, bandwidth enhancement, and co-cross polarization isolation improvements. The proposed 4-element antenna array has a small size and provides a measured bandwidth of 9%, covering the 27.2 GHz to 30 GHz band, with improved gain and cross-polarization suppression.
Rating: 8/1
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Hadi Hijazi, Marc Le Roy, Raafat Lababidi, Denis Le Jeune, Andre Perennee
Summary: This study validates the operation of in-band full-duplex systems over ultra-wide bandwidths and designs an antenna array for this purpose. The prototype achieves self-interference cancellation and high gain in a specific frequency range, and proposes a method to reduce grating lobes in radiation patterns.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Xinrong Shi, Yunfei Cao, Yougen Hu, Xudong Luo, Hua Yang, Liang Hua Ye
Summary: The proposed ultrawideband antipodal Vivaldi antenna features various design elements such as an elliptical-shaped director, metamaterial inspired structure, and symmetrically embedded rectangular slits, achieving high gain and good impedance matching over an extremely wide frequency band.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Guoxiong Cai, Xuehan Liu, Tingting Shen, Jie Liu, Na Liu, Qing Huo Liu
Summary: Recently, metasurfaces have been widely used as 2-D metamaterials due to their advantages in low loss, ease of fabrication, and tunability in incident electromagnetic waves. However, their direct modeling and simulation face challenges due to the subwavelength-thickness nature of metasurfaces. In this study, a high-efficiency spectral element method with generalized sheet transition conditions (SEM-GSTCs) is proposed to overcome these challenges and achieve accurate numerical results for complex functions involving metasurfaces.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yuan Huang, Zhiqin Zhao, Zaiping Nie, Qing-Huo Liu
Summary: To solve the scattering problem of targets moving on the sea, a method called dynamic VESBR (DVESBR) is proposed. DVESBR utilizes a new ray-tracing strategy to ensure correct boundary conditions, and fills the entire space with ray tubes to consider the 3-D scattering problem of targets on a rough surface. Numerical simulations demonstrate the effectiveness of DVESBR.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Geosciences, Multidisciplinary
Jiaqi Xu, Hengshan Hu, Qiwei Zhan, Yang Zhong, Qing Huo Liu
Summary: This paper aims to extend the nearly PML method to time-domain spectral element method (SEM) for simulating wave propagation in the 3D unbounded heterogeneous porous media. By combining auxiliary ordinary differential equations, the proposed scheme preserves the original form of wave equations, leading to a simple and flexible incorporation into the existing algorithm. It avoids temporary convolution, resulting in high computational efficiency. Numerical examples demonstrate the accuracy and stability of the proposed method.
JOURNAL OF APPLIED GEOPHYSICS
(2023)
Article
Optics
Jiankai Xiong, Jiaqing Shen, Yuan Gao, Yingshi Chen, Jun-Yu Ou, Qing Huo Liu, Jinfeng Zhu
Summary: This article presents a divide-and-conquer deep learning model for the design of plasmonic stack metamaterials (PSMs). The model demonstrates significant reduction in prediction error and training parameters in the forward network, supporting powerful inverse design from spectra to PSM structures. Additionally, a flexible tool based on free customer definition is developed for real-time design of metamaterials with various circuit-analog functions.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Pengcheng Ren, Lei Kuang, Jianjun Gao, Qing Huo Liu
Summary: This paper proposes a solution to the modeling of relativistic electromagnetic scattering characteristics from high-speed motion of plasma coated objects. It combines the auxiliary differential equation (ADE) method with the Lorentz finite-difference time-domain (FDTD) method to obtain bistatic polarized radar cross sections (RCSs) from a 3-D object with plasma coated layer in motion.
INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yinong Xie, Yongjie Ma, Xueying Liu, Sayed Ali Khan, Wei Chen, Liguo Zhu, Jinfeng Zhu, Qing Huo Liu
Summary: This study proposes a broadband dielectric metasurface sensor based on guided mode resonances (GMRs) with a dual-degree-of-freedom configuration, which enhances the generation of multiplexed quasi-bound states in the continuum (quasi-BICs), showing excellent molecular fingerprint identification performance in the wide THz band. Compared to conventional sensing methods, the metasensor demonstrates signal enhancement factors of over 19 dB in the entire frequency range from 0.9 THz to 1.6 THz and can accurately analyze the sample composition ratios of mixed isomers. The study explores the multiplexing mechanism of quasi-BICs based on the reconfigurable GMR metasurface and promotes its application in high-sensitivity broadband THz molecular fingerprint retrieval, which is promising for nondestructive detection of trace-amount analytes.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Chunhui Zhu, Zhangqi Yang, Lijun Liu, Longfang Ye, Qing Huo Liu
Summary: This work focuses on the numerical computation of the pulse Green's function (PGF) that arises from electromagnetic radiation and scattering of bodies of revolutions (BoR). The aim is to improve computational efficiency for large-scale BoR problems. The study achieves spectral accuracy for PGF computation using high order Taylor expansions and overcomes the limitations of traditional methods, leading to significant savings in computational expenses as shown by numerical simulations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yi Liao, Guanghui Zeng, Zhibang Luo, Qing Huo Liu
Summary: Frequency-diverse arrays (FDAs) have been widely studied due to their range-angle-dependent characteristics. However, the time-variance of the FDA beampattern hinders its practical applications. Traditional FDA and time-modulated weighted FDA (TMW-FDA) schemes have been analyzed, but the newly designed joint transmit-receive FDA beampattern is not explained by current theories. It is concluded that the time-invariant range-dependent FDA beampattern cannot be achieved, regardless of the transmit scheme used. Numerical simulations validate these conclusions.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Han Lin, Jianliang Zhuo, Lihao Hu, Qing Huo Liu
Summary: This paper presents a 3-D method of moments (MoM) for solving surface integral equations (SIEs) for the electromagnetic scattering of 3-D uniaxial objects in a uniaxial background. The PMCHWT formulation is used to find the induced electric and magnetic current densities on the uniaxially anisotropic objects. The singularity problem in uniaxial EM media is addressed and a new MoM solver is developed allowing for arbitrary optical axes.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Engineering, Electrical & Electronic
Jianwen Wang, Jie Liu, Mingwei Zhuang, Qing Huo Liu
Summary: This paper presents a hybrid method called SESI for simulating the electromagnetic scattering from doubly periodic anisotropic objects embedded in multiple regions of layered media with fully anisotropic materials. The method divides the computational domain into several SEM and SIM subdomains, both of which can be anisotropic. By extending the Green's function, plane wave, and transmission condition in isotropic materials, the method achieves simulation and computation in fully anisotropic materials. Four numerical experiments validate the efficiency and accuracy of the developed method compared with finite element method or analytical solver.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Geochemistry & Geophysics
Yang Zhong, Hanming Wang, Wei-Feng Huang, Yiqian Mao, Mengqing Yuan, Liangze Cui, Qing Huo Liu
Summary: Efficient simulations of moving a triaxial induction well-logging tool in an invaded layered medium are essential for design and calibration. The proposed domain decomposition method separates stationary subdomains and variable subdomains, saving computational efforts. The combination of finite-element method and layered medium surface integral equation method minimizes unknowns and improves numerical accuracy.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Geochemistry & Geophysics
Lianmu Chen, Li-Ye Xiao, Haojie Hu, Mingwei Zhuang, Qing Huo Liu
Summary: In this paper, a multimodule deep learning scheme (MMDLS) with physical constraints is proposed for multiparameter elastic wave inversion of high-contrast objects in inhomogeneous media. The scheme includes a preliminary imaging module (PIM), an image-enhancement module (IEM), and a physical constraint module (PCM). Numerical examples show that this scheme accurately achieves multiparameter elastic wave inversion and has good generalizability.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Computer Science, Information Systems
Na Liu, Chenyang Wang, Xi Chen, Qiuyue Wu, Qiqiang Liu, Mingwei Zhuang, Linlin Shi, Qing Huo Liu
Summary: With the advent of advanced packaging technologies like copper interconnection and 3-D packaging, efficient investigation of thermal analysis for high-performance and complicated electronic devices is crucial for designing effective heat dissipation structures. However, current numerical methods face challenges in conducting multiscale transient thermal analysis for complex electronic devices. To address this issue, this study proposes a 3-D domain decomposition method (DDM) with adaptive time step for transient thermal analysis of integrated circuits (ICs). This new method significantly enhances computational efficiency through flexible multiscale mesh generation and automatic time step adjustments based on posteriori errors. Numerical examples confirm the accuracy and efficiency of the proposed method in considering 3-D transient heat transfer with thermal conduction, natural convection, and radiation boundaries.
Article
Chemistry, Multidisciplinary
Huaxing Fei, Wen Li, Nan Lu, Qinghuo Liu, Youyu Zhang
Summary: Musk xylene (MX), a personal care product, has emerged as a new environmental contaminant. Long-term exposure to MX is associated with various cancers, but the underlying mechanisms are unclear. This study used molecular dynamics (MD) simulation to investigate the interaction between MX and the epidermal growth factor receptor (EGFR). Results showed that MX bound to the extracellular domain of EGFR through van der Waals and nonpolar interactions. The binding affinity of MX to EGFR was highest in one specific binding site, which coincidentally overlapped with the binding area of EGFR's natural ligand, EGF. It was hypothesized that MX activates the MAPK signaling pathway similar to EGF, leading to tumorigenesis.
Article
Computer Science, Information Systems
Pengcheng Ren, Lei Kuang, Jianjun Gao, Qing Huo Liu
Summary: This paper investigates the far-zone polarized scatterings from a moving 3D dielectric coated object by combining the finite-difference time-domain method with Lorentz transformation. The frequency, propagation direction, magnitude of the incident plane wave and the size of the moving object in the laboratory frame are transformed to those in the rest frame that moves with the object. The scattered field near the object is solved by the FDTD method with full permittivity and conductivity tensors, and then the far-zone polarized scattered field is obtained. The research validates the efficiency and accuracy of the proposed method through numerical experiments.
