Article
Engineering, Electrical & Electronic
Yuping Shang, Lixin Dang, Ju Feng, Cheng Liao
Summary: In this study, a transmission-type linear-to-circular polarization conversion electromagnetic metasurface lens with a hemispherical shell profile is presented for enhancing the radiation of a conventional antenna system. The design is compatible with the existing dome geometry and can enhance the link performance of a compact system through a circularly-polarized high gain antenna. By analyzing the transmission phase distribution on the hemispherical surface and designing polarization-dependent unit cell geometry, the hemispherical metasurface is obtained and validated through simulation and measurement.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Optics
Haochen Zhang, Zuojun Zhang, Xiaoliang Ma, Mingbo Pu, Xiong Li, Yinghui Guo, Xiangang Luo
Summary: We propose a dual-band achromatic focusing metasurface based on polarization multiplexing and dispersion engineering. The metasurface utilizes anisotropic resonant phase meta-atoms for independent nonlinear phase manipulation along orthogonal directions. The study demonstrates the construction of the metasurface and broadband reflectarray antenna using a computer-assisted particle swarm optimization algorithm. Experimental results show that the metasurface achieves achromatic focusing and significant broadband reflection gains.
Article
Engineering, Electrical & Electronic
Jinxiu Wang, Jingcheng Zhao, Yongzhi Cheng, Hui Luo, Fu Chen
Summary: This paper presents a dual-band high-gain microstrip antenna with a reflective metasurface. By using the reflective metasurface, the antenna can achieve different polarization radiation at two frequencies and enhance the radiation performance. The experimental results verify the feasibility of the proposed scheme and demonstrate its potential application in modern wireless communication systems.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Kam Eucharist Kedze, Heesu Wang, Ikmo Park
Summary: This study presents a metasurface-based circularly polarized microstrip patch antenna with high performance in terms of global bandwidth and gain. Through the interaction between the metasurface and the microstrip patch with crossed slot, the antenna achieves wide global bandwidth and stable broadside gain.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Zi Long Ma, Xin Feng Xiao
Summary: This communication introduces two additively manufactured bidirectional circularly polarized (CP) antennas that can radiate the same-sense CP waves in opposite directions and switch between right-hand CP (RHCP) and left-hand CP (LHCP) states. Different polarizers, a single-slab dielectric polarizer (Ant 1) and a linearly tapered slot polarizer (Ant 2), are proposed and applied. Experimental results show that both antennas have wide axial ratio bandwidth (ARBW) and high gain, making them superior to conventional designs in terms of performance and ease of fabrication.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Multidisciplinary Sciences
Zhuo Yue Li, Si Jia Li, Bo Wen Han, Guo Shuai Huang, Ze Xu Guo, Xiang Yu Cao
Summary: The study introduces a quad-band dual-circular transmissive metasurface (QCT-MS) capable of converting linear polarization waves to dual-circular polarization waves, suitable for multiband communication and multifunctional dual-circularly polarized antenna systems.
ADVANCED THEORY AND SIMULATIONS
(2021)
Article
Optics
Ping Xu, Yufei Xiao, Haixuan Huang, Tuo Yang, Xulin Zhang, Xia Yuan, Xiong Chao Li, Haidong Xu, Mengyu Wang
Summary: A simple dielectric metasurface hologram is proposed and designed in this work by combining electromagnetic vector analysis and immune algorithm. It can holographically display dual wavelength orthogonal-linear polarization light in the visible light band, solve the problem of low efficiency in traditional metasurface hologram design, and effectively improve the diffraction efficiency. The titanium dioxide metasurface nanorod based on a rectangular structure is optimized and designed, and the metasurface is fabricated using the Atomic Layer Deposition method. The experimental results confirm the feasibility of wavelength and polarization multiplexing holographic display, and indicate potential applications in holographic display, optical encryption, anti-counterfeiting, data storage, and other fields.
Article
Chemistry, Multidisciplinary
Abdul Majeed, Jinling Zhang, Zeeshan Akbar Awan, Saifullah Memon, Muhammad Ishfaq, Chenchen Wang
Summary: This article introduces a novel dual-wideband linear-to-circular polarization converter, which can efficiently convert polarization in two non-adjacent frequency bands. A detailed mathematical investigation is conducted to determine the impact of the phase difference on the conversion effect.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Yueyang Wu, Shengxiang Huang, Lianwen Deng, Chao Tang, Xiaohui Gao, Shuguang Fang, Lei -Lei Qiu
Summary: This paper proposes a dual-band linear polarization converter based on multi-mode metasurface. The converter can tune the two bands relatively independently by changing the physical parameters of the resonator. Experimental results demonstrate that the proposed linear polarization converter works in the two frequency ranges and achieves a high polarization conversion rate.
RESULTS IN PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Teng Li, Jingwen Sun, Hongfu Meng, Yizhu Shen, Sanming Hu, Wenbin Dou, Zhi Ning Chen, Thomas Zwick
Summary: This article introduces a dual-polarized double-layer metasurface lens using split dipole unit cells. It achieves a wide phase range and high transmission coefficient amplitude, performing well in experimental verification at 30 GHz.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Computer Science, Interdisciplinary Applications
Puneeth Kumar Tharehalli Rajanna, Karthik Rudramuni, Krishnamoorthy Kandasamy
Summary: This article presents a slot coupled dual-band metasurface antenna that achieves high gain and circular polarization characteristics. The antenna consists of two different unit cells, resulting in two operating bands. The circular polarization is achieved by diagonally oriented rectangular patch-based unit cells on top of the square substrate. The proposed antenna is fabricated and experimentally validated, achieving a wide impedance bandwidth and a measured 3 dB axial ratio bandwidth with peak gains at specific resonant frequencies.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Qi Zheng, Chenjiang Guo, Jun Ding, Guy A. E. Vandenbosch
Summary: A novel metasurface-based method is proposed for broadband radar cross section reduction of circularly polarized patch antennas, achieving a much broader band than the antenna's operating band. By combining two different destructive interference principles, the broadband RCS reduction is achieved through phase cancellation generated by the metasurfaces and grounded substrate, as well as the polarization conversion property of the metasurfaces.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Multidisciplinary Sciences
Xiaofei Xiao, Jinyou Lu, Fatima Alzaabi, Mahra Almheiri, Vincenzo Giannini, Tadzio Levato
Summary: This work proposes a simple and computationally inexpensive method for designing broadband polarization conversion metasurfaces. By decomposing the system and selecting proper parameters, a metasurface with a relative bandwidth of 97% for converting linearly polarized waves to cross-polarized waves is designed. The method significantly reduces computational expense and can be easily extended to complex structures.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Ran Zhang, Zhichao Zhang, Yuanyi Fan, Hao Zhang, Jinkui Chu
Summary: In this paper, a single-layer transmissive chiral plasma metasurface (SCPMs) suitable for visible wavelength is proposed to overcome the limitations of single-layer chiral metamaterials. The SCPMs is composed of double orthogonal rectangular slots and a spatial pi/4 inclined arrangement, which enables it to achieve a high circular polarization extinction ratio and strong circular polarization transmittance difference. With a wavelength of 532 nm, the SCPMs demonstrates circular polarization extinction ratio and circular polarization transmittance difference of over 1000 and 0.28, respectively. Additionally, the fabrication of SCPMs is realized through the thermally evaporated deposition technique and focused ion beam system, making it a compact structure with a simple process and excellent properties.
Article
Engineering, Electrical & Electronic
Lin-Xiao Wu, Ke Chen, Tian Jiang, Junming Zhao, Yijun Feng
Summary: This article proposes a cascaded metasurface (MS) with circular-polarization-selective properties that can achieve high reflection for left-handed circular polarization (LCP) and high transmission for right-handed circular polarization (RCP). By cascading two kinds of MS sheets, the MS conducts decoupled geometric phase modulations for the LCP reflection channel and RCP transmission channel. The practical applications of the proposed MS are demonstrated by designing a reconfigurable circularly polarized (CP) transmit-reflect-array antenna and a CP bidirectional antenna, both of which exhibit high-gain and high-purity LCP radiations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Zimu Zhang, Yongzhi Cheng, Hui Luo, Fu Chen
Summary: This paper proposes a wideband circular polarization metasurface antenna, consisting of a centrosymmetric structure with a mode suppressor and an asymmetric aperture-coupled feed structure separated by dielectric substrates. Two orthogonal modes with a 90 degrees phase difference are excited by an L-shaped slot and a microstrip line in the aperture-coupled feed structure to achieve CP radiation. Two methods are proposed to expand the CP bandwidth: directly suppressing the characteristic mode and indirectly suppressing it using a mode suppressor. The fabricated antenna shows a low profile of ?(0) x ?(0) x 0.075 ?(0) at 5 GHz, with a 3 dB axial ratio bandwidth of 45.2% (4.1-6.5 GHz), an impedance bandwidth of 41.8% (4.1-6.31 GHz), and a peak gain of 7.94 dBic at 5.9 GHz.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Chemistry, Physical
Beibei Ma, Fu Chen, Yongzhi Cheng, Xian Wang, Shuoqing Yan, Rongzhou Gong, Hui Luo
Summary: In this study, Ti3C2Tx MXene@NiFe-layered double hydroxide (NiFe-LDH) derived multi-interfacial FeNi3/TiN@nitrogen-doped carbon (NC)@magnetic multiwalled carbon nanotube composites were prepared using a hydrothermal process and subsequent carbothermal reduction. The phase compositions, morphology, defects, and electromagnetic parameters of the composites can be adjusted by the thermal treatment temperature. The composites exhibit high reflection loss and effective absorption bandwidth, making them promising microwave absorption materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Optics
Jingcheng Zhao, Nan Li, Yongzhi Cheng
Summary: In this paper, an all-dielectric InSb metasurface is proposed for thermal tunable reflective linear-polarization conversion in the terahertz regime. The unit-cell consists of a single anisotropic InSb micro-cuboid structure adhered to a continuous InSb film, with its electric property actively tunable by changing temperature. The InSb metasurface achieves a high cross-polarization reflection coefficient over 90% and an average polarization conversion ratio over 95% from 1.21 THz to 1.92 THz with a relative bandwidth of 45.4%. The designed metasurface can convert the LP wave into its orthogonal component after reflection over a wide range of frequencies at a given external temperature. The simple geometry and superior performance make it suitable for applications in sensors, reflector antennas, and radiometers in the THz regime.
OPTICS COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Dongru Yang, Yongzhi Cheng, Hui Luo, Fu Chen, Ling Wu
Summary: This paper presents a simple design of an ultrathin and ultra-broadband single-layer metamaterial surface (MS) based on a double-arrow-shaped resonator (DASR) structure for both transmission and reflection modes in the terahertz (THz) region. The single-layer MS consists of a periodic array of metal DASRs and complementary circular patches (CCPs) on a thin dielectric substrate. Numerical results show that the MS structure can convert circularly polarized (CP) waves to their orthogonal components after reflection and transmission simultaneously, with an average amplitude of approximately 0.45 from 0.45 to 1.75 THz and a relative bandwidth of 118.2%. The CP conversion efficiency is close to the theoretical limit of 25% for single-layer structures. Additionally, by adjusting the orientation angle (alpha) of the DASR structure along the wave propagation direction, 0-2 pi phase shifts for the reflected and transmitted orthogonal CP waves can be achieved simultaneously. Numerical simulations demonstrate wave beam deflection, vortex beam generation, and focusing effects for both reflection and transmission modes. This design offers new possibilities and potential for developing multifunctional full-space devices.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Engineering, Electrical & Electronic
Yongzhi Cheng, Yingjie Qian, Haruki Homma, Ashif Aminulloh Fathnan, Hiroki Wakatsuchi
Summary: In this study, two types of waveform-selective microwave metasurface absorbers (MMAs) were numerically and experimentally demonstrated. By designing specific circuit and geometrical parameters, these absorbers can selectively absorb signals of specific waveforms at the same frequencies, including higher-order modes. These waveform-selective MMAs have a wide range of applications in electromagnetic shielding, detection, sensing, and wireless communications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Chemistry, Physical
Fu Chen, Yongzhi Cheng, Xiangcheng Li, Hui Luo
Summary: This study successfully prepared 2D Ti3CNTx-based magnetic composites by modifying Ti3CNTx nanomaterials and combining them with magnetic materials, achieving broadband microwave absorption. The microwave absorption properties of the composites were investigated by varying the volume ratio of the nanomaterials and the filling ratio of the absorber. With a thickness of 1.32 mm, the absorber achieved a bandwidth of 4.75 GHz. Integrated with a macroscale multilayer periodic gradient design, the metastructure based on FCM (Fe@NC/Ti3CNTx) composites achieved broadband microwave absorption with an EAB of 12.5 GHz ranging from 5.5 GHz to 18 GHz at a total thickness of 4.5 mm. The microwave attenuation mechanisms were studied through dielectric loss, magnetic loss, and impedance matching. The multi-scale development of MXene-based magnetic composites enables their potential application in broadband microwave absorption.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Sihai Lv, Yongzhi Cheng, Fu Chen, Xiangcheng Li, Hui Luo
Summary: This study proposes the incorporation of manganese oxide into carbon matrix magnetic composites to enhance the electromagnetic wave (EMW) absorption properties. Multiple interfacial ternary-component Fe3C/MnO/Nitrogen-doped carbon (NC) absorbers were synthesized through facile hydrothermal, oxidative polymerization, and carbothermal reduction processes. The designed composites exhibit excellent EMW absorption properties, with an effective absorption bandwidth of 4.88 GHz (13.12-18 GHz) at a mere thickness of 1.5 mm. The outstanding performance of EMW absorption can be attributed to effective modulation of electromagnetic parameters through a large number of heterogeneous interfaces, defects, and magnetic loss. Meanwhile, adjusting the filling ratios of the composites in the absorber can significantly adjust the electromagnetic parameters of the samples. This work presents an effective approach for the preparation of high-performance EMW absorbers with ternary components, as well as a strategy for developing novel broadband absorbers that are lightweight and have thin thickness.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Automation & Control Systems
Mingkang Long, Qing An, Housheng Su, Hui Luo, Jin Zhao
Summary: In this work, the consensus issues of discrete-time multi-agent systems with completely unknown dynamic are investigated using reinforcement learning technique. A value iteration based model-free algorithm is proposed for consensus of these systems with optimal performance. To implement the algorithm without information of dynamics, actor-critic networks are constructed to estimate the value functions and optimal control inputs in real time. Simulation results verify the validity of the proposed algorithm.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2023)
Article
Optics
Nan Li, Jingcheng Zhao, Peiyi Tang, Yongzhi Cheng
Summary: In this paper, a broadband and high-efficient reflective linear-circular polarization convertor (LCPC) based on three-dimensional (3D) all-metal anisotropic metamaterial (AMM) in terahertz (THz) region is proposed. The LCPC unit-cell consists of a stand-up inverted U-shaped resonator (USR) deposited on a ground plane. The designed LCPC can convert both incident x-and y -polarized (y-pol) waves from linear to circular polarization after reflection in a broadband frequency range of 1.98-4.12THz with high efficiency.
OPTICS COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jintao Zheng, Tianyu Qian, Jiajia Li, Zhiqiang Xiong, Hui Luo, Shilong Jin, Zhiguo Wang
Summary: This paper derives a transfer function model of the spin precession phase and analyzes the noise mechanism of the comagnetometer. It reveals the main sources of noise and emphasizes the significance of spin oscillator symmetry. The paper also discusses control parameter optimization and closed-loop control to enhance the comagnetometer's performance. Furthermore, it explores the trade-off between bandwidth and sensitivity in the comagnetometer system of nuclear magnetic resonance gyroscopes.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Linhui Dong, Yongzhi Cheng, Hui Luo, Fu Chen, Xiangcheng Li
Summary: This paper proposes an all-metal metasurface that enables circular polarization conversion and wavefront manipulation of terahertz waves. Numerical simulations demonstrate high transmission and reflection conversion coefficients over a wide frequency range, as well as the ability to achieve 2 pi-phase full coverage. The study also showcases the multifunctional wavefront manipulation capabilities of the proposed metasurface.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Jiaao Yu, Hui Luo, Zhihui Wang, Sihai Lv, Yongzhi Cheng, Fu Chen, Shuoqing Yan, Xiangcheng Li
Summary: By adjusting the thermal treatment temperatures, magnetic N-doped carbon foams with diverse surface morphologies were synthesized, and their microstructure, electromagnetic parameters, and microwave absorption properties could be tailored. The results showed that the composites exhibited exceptional microwave absorption properties and reduction of the far-field radar cross section (RCS).
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Physics, Applied
Hiroki Takeshita, Daisuke Nita, Yongzhi Cheng, Ashif Aminulloh Fathnan, Hiroki Wakatsuchi
Summary: In this study, a design method for waveform-selective metasurface absorbers operating in multiple frequency bands is presented and validated through numerical and experimental verification. The method allows the absorbers to preferentially absorb target electromagnetic waves of the same frequency based on the incident waveform, specifically the pulse width. By adjusting the spatial ratio of unit cells assigned to different frequencies, the performance of the dual-band approach is enhanced. This study opens up possibilities for the utilization of waveform-selective metasurfaces in diverse frequency bands, providing a valuable and versatile solution for various applications.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Wenzhang Zhang, Jinyao Zhang, Chaoyun Song, Rui Pei, Xuanming Zhang, Haiwen Liu, Congzheng Han, Yi Huang, Jiafeng Zhou
Summary: Due to the low available ambient power level, it is desirable to have a high gain and wide beamwidth antenna. However, it is difficult to achieve both simultaneously. In this study, a multi-port antenna using a nonuniform metasurface is proposed to overcome this limitation. By exciting three modes with complementary radiation patterns, and connecting each feed to a rectifier, the antenna achieves a wide beam and high gain effectively. The proposed rectenna has a beamwidth of 114 degrees with a gain ranging from 8 to 9.8 dBi, and an RF-to-DC conversion efficiency of 3%-67% at 2.45 GHz.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Shangjing Xi, Kai-Da Xu, Shuai Yang, Xue Ren, Wen Wu
Summary: This paper proposes a bandpass frequency selective surface (FSS) with low loss and angular stability based on three metal layers. The FSS structure is built by coupling the top and bottom resonant layers through a metal ring layer. The performance of the FSS is insensitive to the polarization and angle of the incident wave, and the prototype measurements agree with the simulations.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Ibrahim Abuishmais, Hani H. Ahmad, Fadi. R. Shahroury
Summary: This paper presents a WLED driver solution for multi-display screen systems, featuring a single-inductor power stage with independent outputs and multiple WELD strings with independent digital brightness/dimming control for each display. The inclusion of high-side switches enables independent output voltage control and minimized power consumption.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Rawaa Maher, Ahmed Allam, Haruichi Kanaya, Adel B. Abdelrahman
Summary: This paper presents two high-gain, dualband antennas designed to harvest energy from GSM-1800 and the 2.45 GHz ISM frequency bands. The antennas demonstrate good gain and circular polarization characteristics. Additionally, a dualband rectifier is designed to achieve high peak conversion efficiency.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Trapti Sharma, Addagatla Prashanth, Srinivas Bachu, Deepa Sharma, Anil Kumar Sahu
Summary: This article presents two architectures for ternary Schmitt trigger designs based on carbon nanotube technology. The proposed designs demonstrate superior performance in terms of power consumption and power delay product compared to similar designs, and show stability under process variations. These designs have the potential to achieve higher information density and lower power consumption in digital computation.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Tolga Yucehan
Summary: This manuscript introduces an ICFOA-based lossless floating immittance simulator (FIS). The FIS realizes floating capacitance multiplier, simulated floating inductor, and floating frequency-dependent negative resistor through selection of passive elements. Simulation results confirm the ideal performance of the proposed circuit within certain frequency ranges.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Kumar Saurabh, Sukwinder Singh
Summary: This article introduces a method to improve the performance of a power amplifier. By calculating the optimal load and source impedances through source and load-pull analysis, and designing the optimal matching architecture of input and output network using neural network algorithm, the power amplifier achieves high efficiency and gain in the frequency range of 13.75 GHz-14.5 GHz.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Zhengjia Wang, Yongqing Leng, Xin Qiu, Ming Hui, Youbo Jing, Demin Cao
Summary: This paper proposes a novel reconfigurable filter that can flexibly tune both the center frequency and bandwidth simultaneously. The filter consists of a filter network with Chebyshev properties and a parallel resonator. Through simulation and experiments, it has been proven that this reconfigurable filter has a tunable frequency coverage range of 0.4-2 GHz, with a large tunable range.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Audrey Cayron, Christophe Viallon, Ayad Ghannam, Alessandro Magnani, Thierry Parra
Summary: A 4x4 Butler matrix for millimeter-wave communications is presented in this paper, which utilizes a new 3-D Integrated Passive Devices (IPD) process to achieve a higher performance/compactness trade-off. The design incorporates 3-D transformers and solenoids to optimize couplers and phase shifters and results in a wide bandwidth and low insertion loss.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Abdelali Agouzoul, Emmanuel Simeu, Mohamed Tabaa
Summary: This study aims to improve energy efficiency in buildings, specifically in heating control. By utilizing a model predictive control system based on artificial neural network models and advanced technologies such as FPGAs, the study successfully achieved a significant reduction in heating energy consumption in buildings.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Amjad Iqbal, Muath Al-Hasan, Ismail Ben Mabrouk, Pererik Andreasson, Emil Nilsson, Amor Smida, Tayeb A. Denidni
Summary: This study proposes a compact and frequency-adjustable/reconfigurable substrate integrated waveguide antenna for duplex wireless communications. The antenna achieves frequency reconfigurability and high isolation through the use of resonators and dielectric materials. It has stable radiation properties and a wide frequency range, making it suitable for compact reconfigurable devices.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Peyman PourMohammadi, Hassan Naseri, Noureddine Melouki, Fahad Ahmed, Qi Zheng, Amjad Iqbal, Guy A. E. Vandenbosch, Tayeb A. Denidni
Summary: This article presents a novel low-profile self-duplexing antenna with high isolation for out-band operation applications. The antenna features two patches, one rectangular and one triangular, both utilizing the quarter-mode substrate integrated waveguide (QMSIW) cavity for enhanced performance. Miniaturization is achieved through capacitive slots. The antenna operates at both 5.8 and 9.8 GHz frequencies, with impressive alignment between measured and simulated results. It has compact dimensions and 40 dB isolation between its ports, as well as consistent radiation patterns at both frequencies. The gains at 5.8 and 9.8 GHz are 4.1 and 4.6 dBi, respectively. The antenna's frequency bands can be independently tuned by adjusting the size of the capacitive slots. The article also provides valuable insights into the antenna's functionality and versatility, making it a valuable asset for dual-band wireless communication applications.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Duy-Thai Nguyen, Thanh-Hai Le, Van-Sang Doan, Van-Phuc Hoang
Summary: This paper proposes a method that combines UNet and rootMUSIC algorithm to improve the accuracy of DOA estimation. By converting the covariance matrix of received signals into an ideal antenna array's covariance matrix, and then using rootMUSIC algorithm for DOA estimation, the experimental simulation results show that this method can significantly reduce the error of DOA estimation compared with traditional methods.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Shafaq Kausar, A. U. Kausar, Muhammad Usman Hadi, Hani Mehrpouyan
Summary: This paper presents the design of a high gain multi-beam transmitarray antenna, which is capable of independently steering multiple beams in the azimuth and elevation plane. By using a passive meta-surface, the antenna achieves continuous beam steering by adjusting the phase of the unit cell transmission coefficient. The designed antenna is low cost, robust, and suitable for satellite communication and mm-Wave 5G systems.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Jeong-Hun Park, Kyeong-Jun Lee, Seung-Jun Park, Moon-Que Lee
Summary: A new self-oscillating mixer (SOM) has been proposed in this paper, which includes a dielectric resonator (DR) antenna fed by a half-mode substrate integrated waveguide (HMSIW) on an FR4 epoxy substrate using hybrid integrated circuit technique. The high quality factor of the HMSIW resonator and the higher order HEM13 delta mode excitation of the DR radiator contribute to the excellent phase noise performance of the oscillator and the high directivity of the antenna, respectively. The phase noise, estimated LO power, and conversion gain are -102.5 dBc/Hz at 1 MHz offset, 8.74 dBm at an oscillation frequency of 24.15 GHz, and 8.5 dB, respectively. The figure-of-merit for the oscillator is -172.8 dBc/Hz.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
