Article
Engineering, Electrical & Electronic
Reza Aminzadeh, Arno Thielens, Maxim Zhadobov, Luc Martens, Wout Joseph
Summary: This article explores the experimental characterization of on-body propagation channels in different frequency bands, extracting channel parameters such as path gain and delay spread. The study demonstrates higher path gains for vertical and horizontal polarizations in the 900 MHz and 60 GHz bands, respectively. Additionally, the maximum mean excess delay and root-mean-square delay spread were found to decrease significantly in the 60 GHz band compared to the 900 MHz band.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Computer Science, Information Systems
Insang Yoo, David R. Smith
Summary: We propose an uplink massive MIMO system using holographic metasurfaces as a sector antenna operating at 3.5 GHz. The antenna consists of rectangular waveguide-fed metasurfaces combined into a planar aperture, each with subwavelength-sized metamaterial elements as radiators. The metasurfaces support multiple beams and achieve high spatial resolution in the azimuth directions, forming uncorrelated MIMO channels between the base station and users. The proposed metasurface antenna is structurally simple, low-cost, and efficient, suitable for addressing RF hardware issues in massive MIMO systems.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Zhan Wang, Yuandan Dong
Summary: This study presents a miniaturized, vertically polarized antenna based on a metamaterial radiator, with pattern switchable and beam-steering capabilities. By introducing a T-shaped SRR and innovative switchable mushroom reflector, complex beam-steering technology is achieved. This design has significant application prospects in the fields of 5G and smart antennas.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Krishna Tyagi, Ajay Kumar Dwivedi, Suyash Kumar Singh, Pinku Ranjan, Anand Sharma
Summary: In this paper, a four-port MIMO Dielectric Resonator Antenna (DRA) integrated cognitive radio (CR) concept is designed and analyzed for the first time. The proposed antenna utilizes a multipurpose reconfigurable filter design within the feeding structure, making it suitable for both interweave and underlay operations of CR. It operates over a wide frequency range of 2.5-5.8 GHz and can be efficiently used for a Sub-6.0 GHz 5G Communication system.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Computer Science, Information Systems
Darko Cvetkovski, Tim Haelsig, Berthold Lankl, Eckhard Grass
Summary: This study presents experimental results for a four-stream spatial multiplexing setup in a line-of-sight (LoS) wireless backhaul scenario at 60 GHz, demonstrating a highly orthogonal wireless channel with optimal antenna arrangement. Two different equalizers are introduced and evaluated in terms of error vector magnitude (EVM) performance and bandwidth efficiency, achieving error-free transmission with a throughput of 14.08 Gbit/s and validating the practical suitability of LoS MIMO for wireless backhaul applications.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Jiu-Kun Che, Chi-Chih Chen, John F. Locke
Summary: The article presents a compact vehicle antenna design that supports four-channel MIMO operations for 5G Sub-6, LTE, WLAN, and V2X communications, with a total volume of 152 mm in diameter and 20 mm in height. The proposed antenna system produces vertically polarized diversity patterns and relatively uniform azimuthal coverage in the selection combining mode, with good agreement between measurement and simulation results.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Yi Zheng, Cheng-Xiang Wang, Runruo Yang, Long Yu, Fan Lai, Jie Huang, Rui Feng, Chao Wang, Chao Li, Zhimeng Zhong
Summary: This paper explores the unique channel characteristics brought by ultra-massive multiple-input multiple-output (MIMO) technology through channel measurements and modeling. The non-stationarity, spherical wavefront, channel hardening, and sparse properties are validated. A general three-dimensional (3D) sixth generation (6G) non-stationary geometry-based stochastic model (GBSM) for ultra-massive MIMO communication systems is proposed. The statistical properties of channel measurements, channel model, and channel capacities are studied.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Computer Science, Hardware & Architecture
Payam Heydari, Huan Wang, Hossein Mohammadnezhad, Peyman Nazari
Summary: With the rise of 5G technology, portable computing devices capable of handling multi-Gb/s data rates are expected to enter the wireless market. The recent allocation of above-100-GHz band by the Federal Communications Commission presents a great opportunity for the development of high-speed wireless networks. Novel transceiver architectures are needed to address the increasing demand for higher data rates.
IEEE WIRELESS COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Qiuyan Liang, Hanieh Aliakbari, Buon Kiong Lau
Summary: This letter proposes a co-designed millimeter-wave (mm-wave) and sub-6 GHz antenna system, which consists of a reconfigurable 28 GHz mm-wave array and sub-6 GHz antennas. The measured results show good performance of each component in the system.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Wei Sun, Shuxuan Liu, Xu Zhu, Xilin Zhang, Pei-Ling Chi, Tao Yang
Summary: This article proposes a novel 1.05-1.25 GHz filtering antenna feeding network with reconfigurable frequency and polarization. It consists of a reconfigurable in-/out-of-phase filtering power divider and a 90 degrees hybrid coupler. By controlling the varactors in the filtering power divider, the network offers continuous reconfigurable filtering responses and four switchable output patterns. The results show that the proposed technique has good performance, with a frequency range of 1.05-1.25 GHz and errors of phase difference and amplitude imbalance less than 5 and 0.5 dB, respectively.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Computer Science, Information Systems
Jesus R. Perez, Luis Valle, Oscar Fernandez, Rafael P. Torres, Lorenzo Rubio, Vicent M. Rodrigo Penarrocha, Juan Reig
Summary: This paper presents a comparative analysis of concentrated and distributed massive MIMO channels in an indoor environment using ray-tracing. The results show that the distributed MIMO channel outperforms the concentrated MIMO channel in terms of broadband behavior and achievable capacity.
Article
Engineering, Electrical & Electronic
K. Vasu Babu, Sudipta Das, Gorre Naga Jyothi Sree, Shobhit K. Patel, M. Pardha Saradhi, M. R. N. Tagore
Summary: The proposed work aims to develop a parasitic elements-based MIMO antenna for low mutual coupling in sub 6 GHz 5G applications using Machine Learning. The developed MIMO antenna solves the complexity of determining the optimal position of parasitic elements and ground plane dimensions through ML algorithm. The experimental results demonstrate the good performance of the proposed antenna.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2022)
Article
Computer Science, Information Systems
Chenxing Li, Yiping Duan, Bing Du, Xiaoming Tao
Summary: In order to meet the flexible positioning requirements of IoT devices, we have designed an adjustable-distance resonant antenna suitable for 5G communication. Through controlling the distance between three parasitic elements and changing their capacitors, radiation variation in multiple directions can be achieved. Simulation results show that this antenna works successfully in the 15-GHz frequency band.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Boyapati BharathiDevi, Jayendra Kumar
Summary: In this paper, a novel triple-band MIMO antenna inspired by an equilateral triangle is introduced for L and S-band applications. The antenna elements are closely placed with good isolation, covering a wide range of communication bands. The antenna achieves triple-band operation by extending the electrical length of the triangular radiator. It has high gain, good isolation, and quasi-omnidirectional radiation pattern. The proposed design is validated through prototyping and measurements.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2022)
Article
Computer Science, Information Systems
Naveen Jaglan, Samir Dev Gupta, Binod Kumar Kanaujia, Mohammad S. Sharawi
Summary: A 10-element MIMO/Diversity antenna system designed for LTE bands shows good return loss values, antenna efficiency and ergodic channel capacity across different frequency ranges. Factors such as hand grip, battery and LCD screen have been investigated for their effects on the system. Simulation results are validated through fabrication and measurement.
Article
Engineering, Electrical & Electronic
Xiang Li, Mohamed Helaoui, Fadhel M. Ghannouchi, Yulong Zhao, Chang Liu, Wenhua Chen, Mohammad S. Sharawi
Summary: This article extends the theory of Class-X power amplifiers by considering the number of harmonics and demonstrates the impact of the number of harmonics on maximally flat waveforms and efficiency.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Engineering, Electrical & Electronic
Samaneh Sadeghi-Marasht, Mohammad Reza Rahimi, Mohammad S. Sharawi, Anding Zhu
Summary: This paper proposes a novel single-layer planar lens antenna that can maintain circular polarization (CP) of the incoming CP wave and enhance the antenna gain. The symmetric design of the lens unit cell ensures a 90-degree phase difference and high amplitude between two modes of the incoming CP wave. The phase variations created by the designed unit cells result in antenna gain enhancement. The proposed lens is tested with two different feeding antennas and achieves high gains and an impedance bandwidth below 3 dB.
IET MICROWAVES ANTENNAS & PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Kanishka Katoch, Naveen Jaglan, Samir D. Gupta, Mousa Abdollahvand, Mohammad S. Sharawi
Summary: This paper presents an ultraminiaturized bandstop closed-loop 2.5D frequency-selective surface (FSS) for sub-6 GHz 5G wireless communication. The proposed structure forms a modified closed-loop design by interconnecting metallic elements with four metallic vertical vias. It achieves a resonant notch at 3.62 GHz and effectively blocks the entire sub-6 GHz 5G band. The prototype shows good agreement between simulated and measured results and exhibits polarization insensitivity.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Rakhesh Singh Kshetrimayum, Mohit Mishra, Sonia Aissa, Shiban K. Koul, Mohammad S. Sharawi
Summary: This letter calculates the diversity order (DO) and diversity measure (DM) of multiple-input multiple-output (MIMO) antennas in various practical scenarios of single-user, multiuser, and massive MIMO wireless communications. These metrics are computed using the antenna correlation coefficient (ACC) matrix. The DO is obtained from the rank of the ACC matrix, while the DM is derived from the trace and Frobenius norm of the ACC matrix. Numerical results are presented, highlighting that the DM captures the impact of antenna correlation on diversity gain more effectively than the DO.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Computer Science, Information Systems
Hussein Attia, Ahmad Abdalrazik, Mohammad S. Sharawi, Ahmed A. Kishk
Summary: This paper proposes a novel millimeter-wave wideband circularly polarized antenna array for Internet of Things applications. The design uses elliptically shaped dielectric resonator antennas to improve radiation characteristics and achieve circular polarization. Two different sequential-phase corporate feed networks are studied to obtain wider impedance, gain, and axial ratio bandwidths. The proposed antenna exhibits an impedance bandwidth of 35%, a gain bandwidth of 19.3%, and an axial ratio bandwidth of 22.6%. The results show that this wideband circularly polarized antenna has potential in preventing polarization mismatch losses between IoT devices and satellites.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Mohit Mishra, Sumantra Chaudhuri, Rakhesh Singh Kshetrimayum, Mohammad S. Sharawi, Ahmed A. Kishk
Summary: This paper presents a sector-shaped compact p /8 partial substrate integrated waveguide cavity antenna from the TM220 diagonal mode of the SIW cavity. A 61% size miniaturization is achieved compared to the SIW rectangular cavity in its complete mode configuration. The compact cavity radiator is used as an element of a compact 8-port multiple-input-multiple-output (MIMO) antenna.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Chao Li, Mohammad S. Sharawi, Raj Mittra
Summary: An adaptive frequency sampling (AFS) strategy is proposed to reduce the solution time for wideband scattering from objects buried in layered media. The AFS algorithm selects frequency samples (FSs) based on error-estimators, minimizing the number of required samples while guaranteeing solution convergence. Numerical results show significant reduction in sample requirements without compromising accuracy.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Mohammad Moradi, Mohammad S. Sharawi, Ke Wu
Summary: This article presents and derives an analytical model for accurately analyzing lossy dielectric waveguides in the THz regime. By considering the dielectric loss of waveguides and applying the impedance boundary condition (IBC), the proposed method can accurately simulate the waveguiding behavior. The efficiency of the proposed method in terms of simulation runtime is significantly improved compared with some commercial EM software packages, while maintaining a minimum accuracy of 95%.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Computer Science, Information Systems
Saeed Haydhah, Ryan Gold, Zhiyong Dong, Fabien Ferrero, Leonardo Lizzi, Mohammad S. Sharawi, Ahmed A. Kishk
Summary: A new compact multifunctional pattern reconfigurable 2x2 antenna array at 3.65 GHz with high gain and 16 MIMO modes is proposed. The array consists of single-element antennas with U-slots etched on the ground plane and fed using a reconfigurable feeding network. The antenna array achieves high efficiency, peak gain, and impedance-bandwidth, making it suitable for small cell base-station applications.
Article
Engineering, Electrical & Electronic
Reza Shamsaee Malfajani, Hamed Niknam, Sampada Bodkhe, Daniel Therriault, Jean-Jacques Laurin, Mohammad S. S. Sharawi
Summary: This paper presents the design and implementation of a dual wide-band mushroom-shaped antenna. The antenna consists of a cylindrical dielectric resonator (cDRA), a cylindrical dielectric rod as a waveguide (cDR), and a dielectric lens (DL). The antenna operates at sub-6GHz and mm-wave frequencies, achieving high gains. The dual wide-band antenna is designed and fabricated with different dielectric constants, and 3D printing is used to control the dielectric constant of printed components. Measurement results show significant gains and bandwidths in both frequency bands.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Reza Shamsaee Malfajani, Hamed Niknam, Sampada Bodkhe, Daniel Therriault, Jean-Jacques Laurin, Mohammad S. S. Sharawi
Summary: This paper presents the concept of encapsulated dielectric resonator antennas (E-DRAs) where smaller-sized DRAs with a specific permittivity are embedded inside a larger DRA with a lower permittivity, enabling efficient radiation at two widely separated and widely covered frequency bands. The proposed E-DRAs cover the sub-6-GHz band and mm-wave band for 5G and beyond applications, and are fabricated using fused filament fabrication (FFF) 3D printing process. The measurements show high gain and efficiency at both bands, with the achieved bandwidths being the highest among previous works on dual-band antennas.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Reza Shamsaee Malfajani, Jean-Jacques Laurin, Mohammad S. S. Sharawi
Summary: This paper presents the design and implementation of a wideband single-mode dielectric resonator antenna (DRA) with a substrate integrated cavity-backed structure. The DRA is excited by two short-circuited striplines inside the substrate integrated cavity (SIC) to provide stable radiation characteristics and low cross polarization levels. The coupling between the cavity and the cylindrical DRA is achieved through an annular slot, resulting in the excitation of the fundamental HEM11 delta mode over a wide frequency band. The measured performance shows a high gain of 8.2 dBi at 5.45 GHz and a 1-dB bandwidth of 23%.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Usman Qureshi, Muhammad Umar Khan, Mohammad S. Sharawi, Shah Nawaz Burokur, Raj Mittra
Summary: This paper presents a broadband graded index all-dielectric (GID) lens that enables field decorrelation and decoupling of closely spaced wideband multiple-input-multiple-output (MIMO) antenna elements. The proposed technique achieves a reduction in correlation coefficient rho by tilting the individual antenna element radiation patterns and suppressing surface wave propagation inside the antenna substrate using the concept of transformation electromagnetics (TE). Simulated and measured results validate the effectiveness of the proposed technique, which provides reduced rho for both isotropic and non-isotropic propagation environments and enhanced port isolation without reducing the fractional bandwidth (FBW).
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Rifaqat Hussain, Mohamed Abou-Khousa, Muhammad Umar Khan, Mohammad S. Sharawi
Summary: This paper presents a highly miniaturized folded slot-based antenna for internet of things (IoT) applications. The antenna utilizes a unique combination of meandered slot with folded structure and reactive loading with a varactor diode to achieve miniaturization. It operates in dual-bands and covers frequency bands from 730 to 965 MHz and 1250 to 1940 MHz. A single varactor diode allows for continuous frequency sweep over both bands. The proposed antenna design is best suited for next generation 5G IoT applications.
2022 16TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2022)