Article
Physics, Applied
Son Trinh-Van, Thai Van Trinh, Youngoo Yang, Kang-Yoon Lee, Keum Cheol Hwang
Summary: The proposed antenna is a millimeter-wave broadband circularly polarized magneto-electric dipole array antenna with wide overlapped AR/impedance bandwidth. A 2x2 CP array antenna incorporating an improved power divider network was developed based on the proposed CP antenna element. The demonstrated antenna showed excellent performance with a broad overlapped AR/impedance bandwidth, making it a good candidate for 5G mm-wave applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Geng-Bo Wu, Ka Fai Chan, Kam Man Shum, Chi Hou Chan
Summary: The incoming 5G and beyond 5G wireless communications offer unprecedented ultra-high-speed data transmission rates. This article presents novel discrete lens antenna designs to address the challenges of orbital angular momentum (OAM) applications in mmWave and THz bands, opening up possibilities for future high-speed wireless communications.
IEEE COMMUNICATIONS MAGAZINE
(2022)
Article
Engineering, Electrical & Electronic
Yingrui Yu, Zhi Hao Jiang, Jin-Dong Zhang, Wen Wu
Summary: This paper proposes a broadband endfire circularly polarized (CP) antenna with a low-profile feeding structure for millimeter-wave (mmW) applications. By adjusting the amplitude and phase relationships between two orthogonal radiated electric-field components, CP radiated wave can be achieved. The axial ratio (AR) bandwidth of the CP element is significantly expanded by introducing a parasitic director. Compared with other antennas, the proposed antenna has a lower profile of feeding substrate, making it easier to integrate with planar front-end circuits.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Automation & Control Systems
Tian Zhengjuan, Chen Rui, Long Wenxuan, Zhou Hong, Marco Moretti
Summary: Orbital angular momentum (OAM) at radio frequency (RF) is gaining more attention for multiplexing orthogonal OAM modes on the same frequency channel. However, maintaining orthogonality among OAM modes requires perfect alignment of transmit and receive uniform circular arrays (UCAs), which is challenging in practical wireless communication scenarios. Analysis shows that the spectral efficiency of misaligned multi-mode OAM broadband systems is low, but it can be significantly improved by analog or digital beam steering. In practice, baseband digital transceivers with digital beam steering demonstrate higher spectral efficiencies, particularly with large bandwidths and array element numbers.
JOURNAL OF SYSTEMS ENGINEERING AND ELECTRONICS
(2021)
Article
Computer Science, Information Systems
Ahmad Alamayreh, Nidal Qasem, Jamal S. Rahhal
Summary: This study investigates the use of multimodal Orbital Angular Momentum (OAM) in communication systems to achieve high spectral efficiency between a central unit and distributed receiving units. By utilizing antenna arrays and appropriate pre-coding, the central unit can transmit multiple channels with different OAM modes to each receiver simultaneously, resulting in a significant increase in transmission capacity while maintaining a low bit-error rate.
Article
Engineering, Electrical & Electronic
Muhammad Ibrahim Wasiq Khan, Jongchan Woo, Xiang Yi, Mohamed I. Ibrahim, Rabia Tugce Yazicigil, Anantha P. Chandrakasan, Ruonan Han
Summary: This article reports the first chip-based demonstration of a transceiver front end that transmits and receives electromagnetic waves with a helical distribution of wavefront phase. The chip consists of eight 031-THz modulator/detector units and an integrated patch antenna. It can transmit and receive various OAM modes, and has the capability to identify different OAM modes with high rejection of mismatched modes. The chip also demonstrates dynamic mode switching and a full-silicon OAM link.
IEEE JOURNAL OF SOLID-STATE CIRCUITS
(2022)
Article
Computer Science, Information Systems
Rawad W. Asfour, Salam K. Khamas, Edward A. Ball
Summary: This paper proposes a cost-effective mmWave phased array antenna with circular polarization capabilities for beam scanning applications. The design achieves precise control of the main beam steering through a corporate feed network and four-phase shifters. Experimental results confirm the reliable performance of the proposed design, highlighting its potential for practical applications in satellite and wireless communications systems.
Article
Computer Science, Interdisciplinary Applications
Ruiting Lei, Sirong Li, Yang Yang, Baiyang Liu, Li Zhang
Summary: This study proposes a circular antenna array with filtering characteristic for generating vortex waves carrying OAM modes, which demonstrates stable gain within the range of 5.1 to 5.5 GHz. The proposed antenna array shows high potential in enhancing channel capacity and avoiding abnormal frequency interference in wireless communication.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Tarek S. Abdou, Rola Saad, Salam K. Khamas
Summary: This paper introduces a novel 28 GHz circularly polarized rectangular dielectric-resonator antenna (DRA) array for off-body millimeter-wave (mmWave) applications. The rectangular DRA design utilizes a feed network with cross slots to achieve circular polarization. The dimensions of the DRA were (0.48 lambda(o) x 0.48 lambda(o) x 0.27 lambda(o)) at 28 GHz, based on the free-space wavelength. Dielectric layers with human body equivalent parameters were incorporated in the antenna array simulation for off-body communications at 28 GHz.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Electrical & Electronic
Qiannan Ren, Ashraf Uz Zaman, Jian Yang
Summary: This article presents a dual-circularly polarized array antenna based on gap waveguide technology operating at E-band. The antenna utilizes double-grooved circular waveguide polarizers and compact feeding networks and has been verified to perform well within the operating frequency range.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Computer Science, Hardware & Architecture
Peilan Wang, Jun Fang, Weizheng Zhang, Zhi Chen, Hongbin Li, Wei Zhang
Summary: Reconfigurable intelligent surface (RIS) is a promising paradigm for future cellular networks, addressing blockage issues in mmWave or terahertz communications. However, the deployment of RIS complicates system architecture and poses challenges for beam training (BT)/beam alignment (BA).
IEEE WIRELESS COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Wen-Xuan Long, Rui Chen, Marco Moretti, Jiandong Li
Summary: In this paper, a method for estimating angle of arrival (AoA) in OAM communications is proposed based on the ESPRIT algorithm, which reduces misalignment errors in real OAM channels and approaches the performance of ideally aligned channels.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Shehab Khan Noor, Arif Mawardi Ismail, Mohd Najib Mohd Yasin, Mohamed Nasrun Osman, Nurulazlina Ramli, Ali H. Rambe, J. Iqbal
Summary: This article presents the generation of Orbital Angular Momentum (OAM) vortex waves with mode 1 using Uniform Circular Array (UCA) antenna. Two different designs of antenna arrays were fabricated to generate OAM mode 1 at 3.5 GHz. The measurement results agree well with the simulation results, and a higher number of elements in the array leads to higher purity of the generated OAM wave. The proposed antenna design is simple and suitable for 5G mid-band applications.
CMC-COMPUTERS MATERIALS & CONTINUA
(2023)
Article
Materials Science, Multidisciplinary
Zhuoyue LI, Sijia LI, Guoshuai Huang, Xiaobin Liu, Xiangyu Cao
Summary: A coding transmissive metasurface is proposed for generating a specific mode of quad-OAM-beam in a specific frequency range. By introducing phase compensation in the design, the metasurface is able to convert spherical waves into plane waves and enhance the directionality of incidence. Experimental results show that the performance of the metasurface aligns with theoretical analysis. This method has potential applications in multi-channel wireless communication systems.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Engineering, Electrical & Electronic
Lipeng Zhu, Jun Zhang, Zhenyu Xiao, Xiang-Gen Xia, Rui Zhang
Summary: This paper proposes the use of multiple unmanned aerial vehicle (UAV) base stations to serve ground users in the millimeter-wave frequency bands. It formulates a problem to optimize UAV positioning, user clustering, and hybrid analog-digital beamforming for maximizing user achievable sum rate. A suboptimal solution is developed using alternating optimization, successive convex optimization, and combinatorial optimization. The proposed algorithm outperforms benchmark schemes and closely approaches the performance bound of fully-digital beamforming.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Spyridon-Nektarios Daskalakis, Stylianos D. Assimonis, Eleftherios Kampianakis, Aggelos Bletsas
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2016)
Article
Engineering, Electrical & Electronic
Stylianos D. Assimonis, Theodoros Samaras, Vincent Fusco
IET MICROWAVES ANTENNAS & PROPAGATION
(2018)
Article
Engineering, Electrical & Electronic
Spyridon Nektarios Daskalakis, George Goussetis, Stylianos D. Assimonis, Manos M. Tentzeris, Apostolos Georgiadis
IEEE SENSORS JOURNAL
(2018)
Article
Multidisciplinary Sciences
Stylianos D. Assimonis, Vincent Fusco, Apostolos Georgiadis, Theodoros Samaras
SCIENTIFIC REPORTS
(2018)
Article
Multidisciplinary Sciences
Stylianos D. Assimon, Vincent Fusco
SCIENTIFIC REPORTS
(2019)
Article
Chemistry, Analytical
Stylianos D. Assimonis, Sandhya Chandravanshi, Okan Yurduseven, Dmitry Zelenchuk, Oleksandr Malyuskin, Muhammad Ali Babar Abbasi, Vincent Fusco, Simon L. Cotton
Summary: This paper introduces the application of resonant electric-based metamaterial element and its two-dimensional metasurface implementation in various emerging wireless applications, showcasing its potential for applications such as absorption, transmission, and reflection manipulation. The study demonstrates that the resonant electric-synthesized metasurface concept has significant potential for high fidelity absorption, transmission, and reflection characteristics in the microwave frequency spectrum.
Article
Multidisciplinary Sciences
Stylianos D. Assimonis, Gabriel G. Machado, Vincent Fusco
Summary: This study introduces a novel coherent absorber printed using conventional inkjet-printing technology, featuring low cost, frequency independence, polarization insensitivity, wide-angle absorption, and the ability for recongifurable absorbance. Experimental results show near perfect absorption can be achieved with a printed sheet of thickness lambda/215.
SCIENTIFIC REPORTS
(2022)
Article
Computer Science, Information Systems
Dimitrios Tyrovolas, Songbing Liang, George K. K. Karagiannidis, Stylianos D. D. Assimonis
Summary: In this paper, a new two-parametric pulse is proposed, which surpasses existing pulses in terms of bit error rate (BER). The pulse is based on the inverse-hyperbolic functions acsch and asech, and it is the first time they are used for an ISI-free pulse. The design of the pulse only depends on the roll-off factor and timing jitter parameter, making it a two-parametric design. Experimental results demonstrate that this pulse outperforms most well-known pulses in terms of error probability, maximum distortion, and eye-diagram width.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2023)
Proceedings Paper
Computer Science, Information Systems
Konstantinos Dovelos, Stylianos D. Assimonis, Hien Quoc Ngo, Michail Matthaiou
Summary: This paper investigates a new array model for dense integration of multiple antennas, which allows for efficient end-fire operation, super-gain, and high radiation efficiency.
2022 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM 2022)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Stylianos D. Assimonis, Vincent Fusco, Manos M. Tentzeris
Summary: A new metamaterial-based circular polarized electromagnetic energy harvester is proposed in this study, which demonstrates high efficiency and angle insensitivity.
2022 INTERNATIONAL WORKSHOP ON ANTENNA TECHNOLOGY (IWAT)
(2022)
Proceedings Paper
Computer Science, Information Systems
Konstantinos Dovelos, Stylianos D. Assimonis, Hien Quoc Ngo, Boris Bellalta, Michail Matthaiou
Summary: This study investigates the power gain and energy efficiency of using intelligent reflecting surfaces (IRS) for multiple-input multiple-output (MIMO) communications at terahertz (THz) bands. The research shows that beamforming is suboptimal compared to beamfocusing, and an IRS can greatly enhance the energy efficiency of MIMO when operating in the radiating near-field and performing beamfocusing. Numerical results support the analysis and offer insights into the design and performance of IRS-assisted THz communication.
2021 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS WORKSHOPS (ICC WORKSHOPS)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Stylianos D. Assimonis, M. Ali Babar Abbasi, Vincent F. Fusco
Summary: This paper summarizes an investigation on millimeter-wave multimode circular antenna array based beamformer capable of specially encoded data transmission in a wide coverage area. The circular antenna array provides 360 degrees azimuth sector coverage and orbital angular momentum (OAM) mode transmission, making it a good candidate for spatially encoded beamforming for mmWave 5G.
2021 15TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2021)
Review
Engineering, Electrical & Electronic
Benoit Couraud, Remy Vauche, Spyridon Nektarios Daskalakis, David Flynn, Thibaut Deleruyelle, Edith Kussener, Stylianos Assimonis
Summary: The rapid growth of IoT applications poses a significant challenge in power and data transfer optimization, especially in the design of RF systems for overall power efficiency. Effective RF system design should consider impedance matching between antennas and chips to improve overall power efficiency.
JOURNAL OF LOW POWER ELECTRONICS AND APPLICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Okan Yurduseven, Stylianos D. Assimonis, Michail Matthaiou
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
(2020)
