Mourad Nedil

Université du Québec en Abitibi-Témiscamingue

This paper presents a detailed measurement and performance analysis of near-ground propagation channels in an underground mine for both Line-of-Sight (LOS) and Non-Line-of-Sight (NLOS) scenarios. The analysis is derived from channel measurements conducted at a frequency of 2.4 GHz with a bandwidth of 200 MHz, utilizing four different combinations o...

This study presents an ultra-miniaturized implantable in-band full-duplex (IBFD) antenna, designed for wireless capsule endoscopy (WCE) applications. Through the integration of semi-circular slots and shorting pins, the antenna achieves a small volume of 7.17 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999...

In forthcoming 6 G wireless networks, spatial modulation (SM) has established itself as a technique in massive MIMO setups. In this letter, a novel SM architecture embedding linear frequency modulation (LFM) principle is proposed. In the resulting SM-LFM scheme, the data block is split into the signal and the antenna index parts, and prior to its t...

The world is eager to find a solution to reduce the phenomenon of climate change and transition to sustainable and renewable resources in all facets of our lives as we live in this period. Climate change and the emission of greenhouse gases are closely related issues. In that study, we focused on finding ways to reduce municipal management of plast...

New multiband antenna array structure with high gain is proposed for 5G communicationhandheld systems (700MHz/3.5 GHz and 28/38 GHz). The designed structure is proposed using acombination of sub-6GHz and mm-Wave antenna arrays. The antenna is based on S-shaped strip etched onthe top side to operate at 700 MHz. On the other hand, the 3.5GHz band is...

We describe the development and characterization of a stretchy and resilient micro-strip antenna made from a nanocomposite of polydimethylsiloxane (PDMS) and bentonite clay loaded with silver, copper, and graphene nanoparticles. The physical, mechanical, and thermal characteristics of the nanocomposite were extensively evaluated in relation to the...

In this paper, a high-gain circularly polarized (CP) hexagonal antenna array is proposed for RF energy-harvesting applications. The hexagonal antenna array is intended to operate at the frequency of 5.8 GHz. It is composed of 6 multilayer substrate CP antennas excited by an X-shaped aperture-coupling feed structure. A frequency selective surface (F...

In this paper, a performance analysis of millimeter wave (mmWave) massive multiuser multiple input and multiple output (MU-MIMO) channel within an underground mine is performed. The analysis is based on channel measurements conducted at 28 GHz using a base station of 64 virtual antenna elements serving multiple users. Channel characteristics such a...

In this paper, a simple and compact wide-slot circularly polarized antenna backed by a 2×2 artificial magnetic conductor (AMC) array is presented for 5.8 GHz wireless body area network (WBAN) applications. An inverted T-shaped parasitic strip at the open end of a microstrip line extension and slot modification was applied to attain wideband CP. The...

In this study, an efficient model of the channel matrix is developed for a $2\times $ 2 wireless body area network multiple input output (WBAN-MIMO) system based on deep learning algorithms. The model is composed of three deep-learning algorithms. Moreover, the model simultaneously predicts channel matrix $H$ in an underground mine and identifi...

Background & Objective In that work, we get to enhance the unique conductive of imidazole from (>1 × 10−5 S cm−1 to 1.2 × 10−4 S•cm−1 using Graphene and grafting silver and copper Nano metals, which it worked as active sites and charge transfer based on Graphene barrier. Methods Studying the electrochemical behaviors and reaction mechanism using c...

Transceiver hardware imperfections impose enormous challenges on the future network deployment, owing to the degraded performance of channel estimation. In this paper, we investigate the impact of the residual transceiver hardware impairments on the millimiter-Wave (mm-Wave) Multiple-Input Multiple-Output (MIMO) underground channel estimation, in w...

This paper presents 60 GHz radio measurements and channel characterization for wireless rack area network (WRAN) application within a networking enclosure, commonly known as a server rack. The propagation characterization is conducted with wideband and narrowband measurements to characterize the propagation phenomena and investigate the feasibility...

This letter describes a dual-band antenna for energy harvesting applications at 3.5 GHz and 5.8 GHz utilizing a multi-objective Genetic Algorithm (GA). An optimized Defected Ground Structure (DGS) has been etched in the patch antenna’s ground to achieve a dual-band response. Moreover, the GA allows obtaining a maximum gain in both frequency bands....

In this contribution, a new compact CPW-fed antenna with low SAR is designed for wireless body area network (WBAN) devices. It covers the Industrial, Science and Medical (ISM) band of 5.8 GHz. This proposed antenna is backed with an AMC reflector to enhance the gain and isolate the human body from unwanted electromagnetic radiations. To evaluate th...

In this paper, a compact dual-band antenna system is designed for wireless body area network (WBAN) devices. The design is based on a CPW-fed slot antenna operating at 2.4 GHz and 5.8 GHz. To reduce the backward scattering wave towards the human body, a compact double square based on a $4\times 3$ artificial magnetic conductor (AMC) array is propos...

In this paper, the characteristics of two different antenna types; metasurface antennas (MSA) and microstrip patch antenna (MPA) array are analyzed. To compare their sensitivity to bending, multiple numerical studies have been performed on both designs at different curvatures. The footprint of each design is $120 \times 90\ \mathbf{mm}^{2}$ . The d...

A new flexible circularly polarized (CP) wearable antenna is proposed for Wireless Body-Area Network systems (WBAN) operating at 5.8 GHz. The circular polarization is enabled by combining a microstrip-line monopole feed and an inverted L-shaped conformal metal strip extended from a coplanar waveguide. The proposed antenna shows satisfactory perform...

In this paper, a compact triple-band-notched UWB trapezoidal antenna is proposed for off-body wireless body area network (WBAN). To eliminate undesirable signals of conventional narrow-band communication, a three triangular complementary split-ring resonator (TCSRR) are used by etching the radiating element to attain large UWB bandwidth coverage fr...

Machine learning has been used in this work for the development of a Ku band Ridge Gap Waveguide (RGW) slot antenna loaded with an FSS superstrate for satellite internet applications. The structure operates from 13.25 to 14.75 GHz with a gain beyond 10 dB using FSS superstrate loading. The developed machine learning model aims to predict the optima...

In order to get desirable flexible conductive and stretchable materials used as future conductive Devices It should find a pathway or create a new composite that is thermally stable, non-toxic, environmentally inexpensive, easier carrier, and highly efficient. The composite chip is composed of metals nanoparticles (MN, Ag), assembled on a thin laye...

This letter proposes a novel wearable metasurface antenna (MSA) based on electric ring resonators (ERR) for 5.8 GHz wireless body area network (WBAN) applications. All substrates of the proposed design are made from the semi-flexible Rogers RT5880 material. To achieve size miniaturization, 6 × 8 ERR elements are placed on a flat surface connected t...

In this letter, a low-profile and wideband substrate integrated waveguide (SIW) antenna is proposed and validated for full-duplex systems. The proposed antenna operates at 4.9 GHz and 5.8 GHz Wireless Local Area Network (WLAN) bands. Each resonator of the antenna consists of a modified half-mode SIW (HMSIW) cavity, and excited by a 50 $\Omega$ coa...

A quad-element multiple-input–multiple-output (MIMO) antenna is designed at 433 MHz industrial, scientific, and medical (ISM) band, to increase the transmission data-rate and minimize the multipath fading. The proposed MIMO antenna consists of semicircular meandered radiators with a shared ground. It is designed and optimized inside an implantable...

In this study, efficient channel characterisation and modelling based on deep learning algorithms are developed and presented in a line‐of‐sight (LOS) scenario. The learning and the validation processes are performed using measurements from only one environment, enabling robust model learning and prediction results. Then, the model efficiency is an...

This article presents a low-profile multiple-input–multiple-output (MIMO) implantable antenna system, including a capsule endoscopy and a scalp implantation at medical implant communication service (MICS) band (402–405 MHz), and industrial, scientific, and medical (ISM) band (433.1–438.8 MHz). It consists of two elements with an edge-to-edge gap of...

In this paper, A miniaturized dual-band implantable antenna using meandered line resonator is proposed for bio-telemetry applications. The proposed antenna has dual-band (0.91 GHz and 2.45 GHz) operation, covering the important Industrial, Scientific and Medical (ISM) bands. Miniaturization is achieved using meandered resonator and a square slot et...

A highly compact substrate integrated waveguide (SIW) self-diplexing antenna, operating at wireless local area network bands (3.6 and 5.4 GHz), is proposed in this letter. The proposed antenna consists of two closely placed (0.022 $\lambda _{g}$ , where $\lambda _{g}$ is the guided wavelength at 3.6 GHz) quarter-mode SIW resonators, exited by tw...

This article proposes an efficient and complete wireless power transfer (WPT) system (WPTS) for multipurpose biomedical implants. The WPTS is composed of a self-diplexing implantable antenna, efficient rectifier, and WPT transmitter (WPT Tx). The proposed system is capable of simultaneously transmitting recorded data and recharging the batteries of...

In this study, an ultra–miniaturized implantable antenna based system with ultra-wideband characteristics in the industrial, scientific, and medical band (i.e., 2.4–2.48 GHz) is proposed for biomedical applications. A biocompatible and flexible liquid crystalline polymer material, Rogers ULTRALAM (tanδ = 0.0025 and εr = 2.9), is employed as both th...

Highly conductive materials, with minimal thickness and capable to afford electromagnetic interference (EMI) shielding, are highly advantageous, particularly if they are able to be easily processed into thin films. Here, we demonstrate the potential of a sandwich-like structure of a two-dimensional Ti3C2Tx MXene/Graphene nanoplatelets (GNPs) compos...

In this paper, a nested square-shape dielectric resonator (NSDR) has been designed and investigated for antenna applications in the microwave band. A solid square dielectric resonator (SSDR) was modified systematically by introducing air-gap in the azimuth (ϕ-direction). By retaining the square shape of the dielectric resonator (DR), the well-known...

In this letter, a new design of reconfigurable stop-band in UWB band-pass filter based on resonator-loaded slot-line is presented and implemented. The obtained stop-band response is performed by embedding a single PIN diode in the resonator. When the PIN diode state is OFF, a UWB response is achieved. Nevertheless, when the diode is in ON, a notch...

This paper presents a set of statistical channel models based on 60 GHz radio measurements in a server room. The channel models are developed for possible use-cases, corresponding to potential deployment scenarios in wireless data centers (WDCs). A simple parametric channel model is used to model both the deterministic and stochastic channel parame...

This letter proposes a low profile substrate integrated waveguide (SIW) cavity backed self-quadruplexing antenna for wearable devices. The full-mode circular SIW cavity is split to four unequal quarter-mode SIW (QMSIW) cavities by using two diagonal slots on upper layer of the cavity. The proposed antenna uses C-shaped slot in combination with arc-...

This study presents a multi-band conformal antenna based endoscopic system for robust biotelemetry communications, which covers five important bands, including the MedRadio (401–406 MHz), Industrial, Scientific, and Medical (ISM) (433.1–434.8 MHz, 868–868.6 MHz, 902–928 MHz), and midfield (1200 MHz) bands. These bands are intended for functions suc...

This letter presents a set of 60 GHz MIMO channel measurements to investigates the diversity gain in an underground mine. A 2 2 MIMO propagation measurements were performed in line-of-sight (LOS) within an underground gold mine to investigate the frequency selectivity in the 57-64 GHz band. The measured coherence bandwidth and the excess delay were...

Genetic algorithm (GA) optimization is applied to design an Ultra-wideband UWB-CPW-fed Trapezoidal with a dual-band frequency notch. A two-dimensional (2–D) matrix chromosome is used in the GA to represent a wide-range on planar trapezoidal element. It is shown that the GA generates antenna designs exhibit equal wideband performance defined by VSWR...

In this paper, a novel design of dual-band antenna using a genetic algorithm (GA) for wireless body area network (WBAN) device is proposed. It covers the Industrial, Scientific and Medical (ISM) bands of 2.45 GHz and 5.8 GHz. An AMC reflector is utilized to isolate the human body from undesired electromagnetic radiation and improve the antenna radi...

A dual-band circularly polarized (CP) printed monopole antenna backed with a 3×3 artificial magnetic conductor (AMC) array is presented for wireless body area network (WBAN) applications. The antenna is composed of a rectangular monopole and an asymmetric ground plane. By introducing the C-shaped ring, CP radiation could be achieved. To reduce the...

Interleave division multiple access (IDMA) has become a promising solution for performance enhancement of future access networks. In this paper, we investigate the performance of IDMA scheme within millimeter (mm-Wave) underground communications, by exploiting the space- time-block coding (STBC) diversity, and adopting the group random permutation...

A novel high-efficiency 8-beams dual-polarized array antenna using an 8×8 beamforming network is studied and developed at 60-GHz. Two 4×4 Butler matrices are employed as base beamformers, and two 4×8 pattern control networks are utilized for increasing the number of the radiating elements and suppressing sidelobes in the proposed dual left/right-ha...

In this paper, the use of circularly polarized multiple-input-multiple-output (MIMO) antenna systems is proposed as a new solution for future body-to-body (B2B) applications. Four B2B channels have been characterized inside a mine. The statistical parameters of the B2B channels using co-positioned (CP) and 90 degrees rotated (90R) antennas have bee...

Here, an ultra‐compact Multi‐Input‐Multi‐Output (MIMO) antenna system is presented for Wireless Local Area Network (WLAN) applications. The proposed antenna compactness approach is based on using Cylindrical‐Dielectric‐Resonator‐Antenna (CDRA) symmetry with the help of image theory to achieve the best size reduction of the resonators and maintain t...

A deterministic approach is presented for modeling a wireless propagation channel in a stairwell environment. The Ray-Tracing (RT) method is used to find the reflected and diffracted rays with highest contribution to the total received power at a given location. Most significant reflected rays occur at the surfaces of specific steps of the stairwel...

In this paper, a novel design of dielectric resonator antenna (DRA) with a reconfigurable radiation pattern capability is presented. Reconfigurability in the azimuth plane is achieved by symmetrically placing six electromagnetic bandgap (EBG) sectors around the DRA. Each sector is composed of twenty-six circular shaped mushroom-like EBG unit cell....