Article
Engineering, Electrical & Electronic
B. Hammache, A. Messai, I Messaoudene, T. A. Denidni
Summary: This paper proposes a compact stepped slot antenna for ultra-wideband applications, achieving a very small size and wide operating bandwidth. By integrating a stepped slot on the back side and exciting it using a 50 omega-feed line on the top side, the antenna demonstrates a large impedance bandwidth. Additional elementary slots are utilized to further increase the operating bandwidth, resulting in an omnidirectional radiation pattern in the H-plane and bidirectional pattern in the E-plane.
INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES
(2022)
Article
Computer Science, Information Systems
Wahab Mohyuddin, Gwan Hui Lee, Dong Sik Woo, Hyun Chul Choi, Kang Wook Kim
Summary: The planar ultra-wideband phase inverter is designed to generate wideband 180 degrees phase differential signals at high microwave frequencies up to millimeter-waves. The design is based on impedance matching and smooth field transformation between transitional stages, resulting in a compact-sized transition with ultra-wide frequency bandwidth.
Article
Computer Science, Information Systems
Zhengrui He, Jie Jin
Summary: This paper proposes a compact and highly isolated four-port ultra-wideband MIMO antenna, which achieves broadband characteristics through etching a metamaterial structure and designing coplanar waveguide feeds. The designed MIMO antenna exhibits good radiation properties and gain, while improving isolation through polarization diversity technology.
Article
Engineering, Electrical & Electronic
Rui Xu, Zhongxiang Shen, Steven Shichang Gao
Summary: This article proposes a novel ultra-wideband circularly polarized antenna array with sequential phase feed. The array achieves UWB circularly polarized radiation using a multiresonance monopole element. By analyzing the characteristic modes at different frequencies, the study demonstrates that the element can achieve good CP radiation at three adjustable frequencies. A compact 2x2 array is designed and optimized to achieve higher realized gain and stable radiation pattern. The fabricated prototype of the array shows an overlapping bandwidth of 120.9% from 1.8 to 73 GHz.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Telecommunications
Wei He, Yejun He, Long Zhang, Jun Hong, Haixia Cui, Amir Boag
Summary: In this paper, a new compact ultra-wideband (UWB) circularly polarized (CP) antenna array for vehicular communications is proposed. The antenna array utilizes a T-shaped cross dipole loaded with parasitic rectangular elements to expand the bandwidth and improve the radiation pattern. The proposed antenna also achieves improved gain without increasing its size compared to the traditional cross dipole.
CHINA COMMUNICATIONS
(2023)
Article
Computer Science, Information Systems
Nonchanutt Chudpooti, Patchadaporn Sangpet, Tanaporn Pechrkool, Nattapong Duangrit, Wanwisa Thaiwirot, Prayoot Akkaraekthalin, Nutapong Somjit
Summary: This paper presents a 3D-printed hemispherical lens integrated with a planar ultra-wideband (UWB) antenna. The lens is designed and fabricated from ABS, and it enhances the UWB antenna's high-gain radiation by reducing wave reflection. The proposed additive 3D-printed dielectric lens antenna offers advantages such as ease of design and assembly, low-cost fabrication, and size reduction for high-gain antennas.
Article
Computer Science, Information Systems
Guangyao Yang, Shengbo Ye, Feng Zhang, Yicai Ji, Xiaojuan Zhang, Guangyou Fang
Summary: The study presents a dual-polarized, double-slot tapered slot antenna with a double-layer, dual-loop structure and novel slot edges, which allows for miniaturization, ultra-wideband and high gain in antenna design. By utilizing a magnetic dual-loop structure, the antenna's low cutoff frequency is reduced, while achieving high gain and low sidelobe level.
Article
Chemistry, Analytical
Mohamed Marzouk, Youssef Rhazi, Ibrahime Hassan Nejdi, Fatima-Ezzahra Zerrad, Mohamed Saih, Sarosh Ahmad, Adnan Ghaffar, Mousa Hussein
Summary: A compact dual-wideband fractal antenna is designed for multiple applications, including Bluetooth, WiMAX, WLAN, C, and X band. The antenna achieves high gain and bandwidth with a small volume using a circular resonator with square slots and a gap line on the ground plane. The measured results confirm its efficiency and dual-band frequencies ranging from 2.30 to 4.10 GHz and from 6.10 GHz to 10.0 GHz.
Article
Engineering, Electrical & Electronic
Mubarak S. Ellis, Javad Nourinia, Changiz Ghobadi, Bahman Mohammadi
Summary: This paper proposes a two-port planar ultra-wideband pattern diversity antenna, which uses a modified partial common ground plane to improve antenna performance and has a smaller footprint, larger bandwidth, and more straightforward design compared to existing designs.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
Hong Yuan, Fu-Shun Zhang, Jun-Jie Zhang, Yun-Xia Feng, Yuan-Fei Liu
Summary: This paper presents a compact ultra-wideband multiple-input-multiple-output slot antenna with dual band-notched performance. The novel transmission structure improves the impedance matching and achieves wideband characteristics. The in-phase superposition radiation of four-way open slots is realized by utilizing the odd mode operation of the transmission structure. The isolation and notched band characteristics are achieved through the T-slot structure and split-ring resonators.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Computer Science, Information Systems
Seungyong Park, Kyung-Young Jung
Summary: This paper presents a novel compact UWB planar monopole antenna designed for precise indoor positioning system. The antenna operates in the frequency range of 3.1 GHz to 10.8 GHz and exhibits wide bandwidth and omnidirectional radiation patterns. The proposed design meets the requirements for integration with printed circuit boards and offers good performance in complex multipath environments.
Review
Engineering, Multidisciplinary
Sahar Saleh, Mohd Haizal Jamaluddin, Faroq Razzaz, Saud M. Saeed, Nick Timmons, Jim Morrison
Summary: Higher performance, lower cost, and compact size antennas are crucial in today's wireless communication system. This review explores the development of ultrawide band (UWB) TSA designs over the past twenty years, focusing on their compactness and performance enhancement strategies. Extensive comparison tables are used to highlight the pros, cons, and practical applications of different TSA designs. The aim is to provide guidance for researchers and RF designers in creating high resilient Vivaldi antenna designs.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Multidisciplinary
Sahar Saleh, Widad Ismail, Intan Sorfina Zainal Abidin, Moh'd Haizal Jamaluddin, Mohammed H. Bataineh, Asem S. Alzoubi
Summary: By changing the transition shape from Microstrip to Slot line, a compact UWB Vivaldi Tapered Slot Antenna design was achieved. Among the four models analyzed, Model D exhibited significant size reduction and improved performance, with hardware measurements confirming the validity of the proposed antennas.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Wei Hao Chen, Jian Wei Pan, Duo-Long Wu
Summary: This paper presents an ultra-wideband dual circularly polarized slot antenna with high isolation. The design incorporates L-shaped probes and a ladder strip to achieve four impedance resonance modes, while a bent strip moderates the impedance to achieve an ultrawide impedance bandwidth. Additionally, L-shaped strips combined with the ladder strip create circularly polarized modes at different frequency bands, and the bent strip creates a third circularly polarized resonance mode. The antenna demonstrates excellent performance with a wide impedance bandwidth, high isolation, and high gain.
INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS
(2023)
Article
Chemistry, Analytical
Jiwan Ghimire, Dong-You Choi
Summary: This paper proposes double slot podal and antipodal ultra-wideband microstrip antennas for a fluid property measurement system. The performance verification and comparison of the antennas are discussed, along with their impedance bandwidth and gain.
Article
Computer Science, Information Systems
Ke Chen, Junhui Chen, Xuanying Hou, Mingwei Zhuang, Qing Huo Liu
Summary: In this paper, the symmetric Lanczos algorithm is combined with the mixed finite element method to improve the efficiency and accuracy of S-parameter simulation in a broad frequency band. The mixed finite element method based on tree-cotree splitting is adopted to overcome the low-frequency (high-density) breakdown problem and ensure accuracy. The modified symmetric Lanczos algorithm is used for fast frequency sweep and the high frequency results are improved by increasing the number of Lanczos vectors. Numerical simulations are conducted to verify the hybrid method.
Article
Geochemistry & Geophysics
Qi Qiang Liu, Mingwei Zhuang, Weichen Zhan, Linlin Shi, Qing Huo Liu
Summary: A hybrid implicit-explicit discontinuous Galerkin spectral element time domain algorithm is proposed for simulating 3D elastic wave propagation in inhomogeneous media. The method utilizes well designed subdomains with independent mesh generation, allowing flexible spatial discretization of complex geometry. Spectral elements with different interpolation orders and a Riemann transmission condition are employed for efficient multiscale problems and parallel computing. The accuracy, robustness, and efficiency of the algorithm are validated through quantitative waveform comparisons with COMSOL.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Hongyan Deng, Mingwei Zhuang, Yongfu Fang, Jianyang Zhou, Qing Huo Liu
Summary: In this article, a fast multiphysics computational technique combining the spectral element time-domain (SETD) method with the matrix pencil method (MPM) is developed to analyze RF acoustic wave resonators and filters. The results demonstrate that the MPM can significantly reduce the simulation time of the SETD method while ensuring accuracy and can extrapolate time-domain data of double-mode SAW filter oscillations. Additionally, the truncated time record is efficiently extended into the future using MPM to obtain accurate parameters without further SETD computations. The theory behind this processing is presented, and three examples are analyzed to illustrate the method's efficiency.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Jiawen Li, Hao-Jie Hu, Jianwen Wang, Mingwei Zhuang, Li-Ye Xiao, Qing Huo Liu
Summary: This paper proposes a novel end-to-end artificial neural network (ANN)-based 2-D electromagnetic full-wave inversion (FWI) scheme that allows different transceiver configurations in training and testing. By using an equivalent current on the boundary, the scattered field data recorded by different transceivers can be connected. The proposed transformation enables the ANN training and testing for FWI to be implemented for different transceiver configurations. Numerical examples are provided to validate its feasibility.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yiqian Mao, Yang Zhong, Qiwei Zhan, Dezhi Wang, Qing Huo Liu
Summary: This work presents an alternative approach to apply the Calderon preconditioner to a finite-element boundary-integral system, and proposes a twofold iterative solver where the finite-element subsystem and boundary-integral subsystem are preconditioned separately. Numerical experiments are conducted to compare the accuracy and convergence of the proposed method with the approach based on the Poincare-Steklov (PS) operator.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Xue Liang Wu, Junwen Dai, Jie Liu, Jin-Hui Chen, Qing Huo Liu
Summary: Recently, there has been a lot of interest in reshaping the transverse light field profile in nonlinear multimode fibers (MMFs). However, the traditional computational electromagnetic (EM) methods are not suitable for accurately calculating the EM fields in these nonlinear media due to the nonlinearity of Kerr optical materials in graded-index (GRIN) MMFs. To address this issue, an iterative division method based on the 2.5-D spectral numerical mode matching (SNMM) method is developed. The SNMM method is a semianalytical approach that can significantly reduce computational costs while providing highly accurate solutions.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yiqian Mao, Qiwei Zhan, Qingtao Sun, Dezhi Wang, Qing Huo Liu
Summary: Numerical modeling of thin structures can result in computationally expensive dense volumetric discretization and poor mesh quality. Equivalent boundary conditions (BCs) have been proposed to replace thin structures with zero-thickness surfaces, but their accuracy decreases as the thickness increases. This work presents a mesh-splitting technique for the impedance transition BC (ITBC) to effectively eliminate this error without increasing the number of unknowns. The proposed technique shows improved accuracy compared to other equivalent BCs and is incorporated into the SESI method for modeling doubly periodic problems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yuheng Li, Guang Yang, Weiwen Li, Qing Huo Liu
Summary: This paper proposes a compact antenna design that utilizes the ground plane as the OAM wave radiator. By utilizing characteristic mode analysis and introducing two bent metal strips with grounded ends around the rectangular ground plane, degenerate modes of the ground plane can be excited and a first-order OAM mode is generated. The antenna also exhibits dual-band characteristics and simple feeding, making it suitable for mobile terminal applications.
JOURNAL OF ELECTROMAGNETIC ENGINEERING AND SCIENCE
(2023)
Article
Optics
Bin Wei, Han Zhu, Qiuyue Wu, Guoxiong Cai, Qinghuo Liu
Summary: Radiative cooling, a promising technology that requires no external energy to lower temperature, has gained significant attention recently. However, designing a metamaterial cooler remains a challenge due to the complexity of nanostructures and low average absorptivity. This study proposes a capped metal-insulator-metal metamaterial that achieves ultra-broadband perfect absorption, with an average absorptivity of 94% in the 8-13 μm wavelength range. It demonstrates excellent selective thermal emissivity in the infrared atmospheric transparent window, along with polarization insensitivity and wide-angle independency.
Article
Computer Science, Information Systems
Yiwen Yao, Mingwei Zhuang, Junhui Chen, Ke Chen, Qing Huo Liu
Summary: In this work, SAW resonators with LiNbO3/SiO2/Si multi-layer structure were designed using the spectral element method. An equivalent small-aperture 3D structure was modeled to avoid simulating the full structure of the resonator. The one-port SAW resonators were then connected in ladder networks to form band-pass SAW filters.
Article
Computer Science, Information Systems
Baoquan Duan, Shijiu Zheng, Miao Zhang, Jiro Hirokawa, Qing Huo Liu
Summary: A new single-layer corporate-fed substrate integrated waveguide slot array antenna is proposed and verified, which has the characteristics of low profile, easy fabrication, low cost, low sidelobes, wideband operation, and high efficiency. A V-band 16 x 16-element array is designed and fabricated using a conventional PCB process. The measured results show that the antenna achieves a 16.2% bandwidth covering the 57-67 GHz frequency range and a gain higher than 30 dBi and efficiency higher than 45% over the 58-65 GHz frequency range.
Article
Engineering, Electrical & Electronic
Xue Liang Wu, Jie Liu, Jin-Hui Chen, Qing Huo Liu
Summary: In this study, an improved spectral numerical mode matching (SNMM) method is used for the first time to simulate fiber Bragg gratings (FBGs). By using the relative permittivity perturbation as the source, the new SNMM method directly correlates the total electromagnetic field with the excitation coefficients based on the eigenmodes.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Geochemistry & Geophysics
Dezhi Wang, Yunyun Hu, Yuan Fang, Yiqian Mao, Qing Huo Liu
Summary: In this study, a modified volume integral equation method is proposed, combining the domain decomposition method with the adaptive cross approximation method, to solve the 3D electromagnetic scattering problems in complex heterogeneous media. The new method does not strictly require conformal and uniform meshes, providing higher flexibility, and achieves linear complexity in both storage and computation, resulting in improved performance in memory and CPU time cost.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Engineering, Electrical & Electronic
Yinong Xie, Xueying Liu, Jun Zhou, Huifang Zhang, Jing-Yu Lin, Wei Chen, Li-Guo Zhu, Kun Meng, Qing Huo Liu, Jinfeng Zhu
Summary: Dielectric metasurfaces with lower optical losses than metallic metasurfaces have attracted attention for boosting trace sensing of THz molecular fingerprints. In this study, we fabricate a THz dielectric metasurface of lossy silicon with a gold mirror and demonstrate its angle-multiplexed fingerprint metasensing scheme. The use of a gold mirror plays a critical role in boosting broadband THz fingerprint detection.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Engineering, Electrical & Electronic
Ruichen Luo, Lixiao Wang, Zheng He, Fen Xiao, Li-Ye Xiao, Qing Huo Liu
Summary: This paper proposes a wideband system for retrieving the complex permittivity values of materials. The system consists of a well-designed testing holder and a customized machine learning-based algorithm. The system reduces complexity and systematic errors through a simple testing procedure and a quasi-coaxial structure. Numerical simulations and measured data demonstrate the effectiveness of the proposed method.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
