Larbi Talbi

Université du Québec en Outaouais · Département d'informatique et d'ingénierie

This letter proposes a bilayer transmissive Huygens metasurface with an independent phase response for two orthogonal polarizations to generate two distinct modes of Orbital Angular Momentum (OAM) beams. The performance of the proposed unit cell is comprehensively investigated, and its efficiency in the near field is verified through an analytical...

This paper proposes an antenna based on the Substrate-Integrated Waveguide (SIW) to cover both middle- and long-range with dual-circular polarization for automotive polarimetric radar at 78 GHz. The proposed antenna comprises six columns of SIW linear inclined slot arrays fed by two same feeding networks from both sides to realize Right-Hand and Le...

In today’s world, artificial satellites serve a variety of vital applications, ranging from communication and navigation to weather monitoring and scientific research. In the meantime, increasing space debris could threaten artificial satellites’ functionality and safety. Currently, a large amount of space debris orbits the earth at high speeds, su...

In dual-band RF front-end systems, to transmit different frequency signals in different paths, each path requires the power to be divided along two transmission channels. In such systems, a circuit is created in which the input ports of power dividers with different frequency bands are connected to the output ports of a diplexing circuit in a casca...

In this paper, a multifunctional beam forming architecture is studied in detail for intelligent transportation systems and advanced vehicular technologies. The proposed structure can radiate or receive multiple beams simultaneously. This system can significantly improve the scanning coverage and channel capacity based on a switched beam methodology...

Millions of passengers use High-speed trains (HSTs) daily, in the world. The roofs of HSTs can be equipped with a variety of transmitting and receiving antennas to accommodate high-data-rate Internet services with reliable radio access for passengers. The design of commercial antenna systems is a compromise between cost, size, manufacturability, an...

The serious problems with rail radio systems across the world mainly originated from poor train antenna design and deployment. Hence designing antennas for reliable radio access is so essential in public advanced railway systems. On the other hand, the mm-wave frequency spectrums are recognized sources of valuable frequencies to supply the high-rat...

In this work, a novel electrically reconfigurable phase shifter based on a half-mode sub-strate integrated waveguide (HM-SIW) is proposed. SIW is a guided transmission line topology, and by using half-mode excitation, a smaller size can be achieved. Phase shifters are electronic devices that change the phase of transmission for a wide range of appl...

This paper proposes a robust approach for developing a new class of electrically reconfigurable phase shifter. This design employs via posts on SIW technology in conjunction with surface mount PIN diodes. To ensure optimal performance over the intended frequency band in a space-efficient manner, the transmission line is based on a substrate integra...

In this letter, we discuss a methodology of converting a modular antenna array, which was originally designed for the 23 GHz unlicensed band, to the emerging 60 GHz 5G band for a short-range millimeter-wave (mm-wave) detection application. The feeding structure is made up of substrate-integrated waveguide (SIW) and coupling brick-slots, allowing re...

In this paper, first, a single element of a novel helix antenna based on printed circuit board (PCB) technology with high efficiency, broadband, and low front-to-back ratio for WLAN applications, is presented. The simulated results indicate that the impedance bandwidth of the proposed helical antenna for S11 < −10 dB is about 24.8% from 5.3 to 6.8...

In this paper, first, a novel compact configuration of a multi-layer diplexer is introduced for Ku-band applications. The proposed structures are based on substrate integrated waveguide (SIW) technology. The main novelty of the proposed structure is to utilize an extended SMA instead of complex filters in a diplexer topology. The location of this S...

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...

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...

A stacked multi-layer substrate integrated waveguide (SIW) microstrip patch antenna with broadband operating bandwidth and low cross-polarization radiation is provided. A complete study on the propagating element bandwidth and cross polarization level is presented to demonstrate the importance of the design. The proposed antenna includes three stac...

This article presents a new Butler matrix made on a stacked Printed Circuit Boards (PCBs). The matrix is based on Substrate Integrated Waveguides (SIW) and microstrip lines. Transitions using through metallic vias are designed and optimized for the crossover sections of the matrix. The other components of the circuit are the followings: 3-dB SIW di...

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...

A simple synthesis method for ultra-thin double-sided cross-dipoles-based Frequency Selective Surfaces (FSS) is presented in this paper. The presented technique is used to design a flexible band-stop FSS for Electromagnetic Interference (EMI) shielding applications operating at 10 GHz. An Equivalent Circuit (EC) combined with a closed-form expressi...

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...

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...

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...

This paper presents broadband simulations and measurements of Millimeter-Waves (mm-wave) propagation in a rugged underground mine environment. Mathematical formulation was carried out in the framework of Uniform Theory of Diffraction (UTD) to develop a deterministic Ray-Tracing (RT) model under Line-Of-Sight (LOS) condition. The developed theoretic...

Aims This paper presents an investigation of image transmission using SC-FDMA system over wireless fading channels. Background A comparison is performed between the performance of the wireless transmitted image over 3GPP LTE channel (vehicular and pederstain) and mmWaves measured channel at 29.5 GHz. Objective One of the important benefits of thi...

In radiofrequency (RF) applications, reducing the structure size of the phase shifter (PS) other remains a key challenge. In this article, a new compact‐wilds‐phase shifter for reducing the size area of the conventional design has been introduced. Unlike, conventional shifter, the proposed one leverages metamaterial for size reduction by using comp...

This paper presents a design method of wideband Fabry-Perot resonator antennas (FPRAs) with two layers of electrically thin dielectric superstrates. The bandwidth enhancement mainly benefits from the superstrate structure with reflection phase increasing with frequency, which is used as a partially reflective surface (PRS). The proposed method is v...

In this study, a new design of a planar ultra-wideband (UWB) monopole antenna with a rose-curve contour shape is proposed. The rose-curve circumference of the monopole is expressed in polar coordinates as: r=r0+acos(nθ). This function enables a flexible and easy to control layout, which directly affects the antenna's response. The arguments of the...

This paper presents a modified selective mapping (MSLM) based on the peak-to-average power ratio (PAPR) reduction technique for the single carrier frequency division multiple access with multiple input multiple output uplink system (SC-FDMA MIMO). The main idea of the proposed scheme is to use the same phase vectors for all antennas unlike the conv...

Several new compact microstrip dual-band bandpass filters using admittance inverters and open-ended resonating stubs are introduced. Operating at the center-band frequencies of 1.8 and 2.4 GHz, with moderate bandwidth passbands, the proposed devices are suitable for LTE mobile cellular networks and Wi-Fi technologies. The design procedure includes...

This paper proposes a robust option for developing a new class of efficient and cheap antenna array based on patch array fed by substrate-integrated waveguide (SIW) through slot apertures for wireless backhauling applications. It consists in performing the feed network in SIW and the radiating structure in microstrip technology. The microstrip line...

A novel two-step algorithm to accurately analyze the transmission properties of the transmission lines loaded with electrically small resonators is introduced. The algorithm comprises a set of equations to predict and modify the geometrical parameters of the transmission line when loaded with the electrically small resonators. To verify the algorit...

In this work, a parametric study of the complementary rose-curve inclusion in size reduction applications is presented. Through numerical analysis and experimental data, we show the feasibility of controlling the electrical length and thus the physical length of the loaded transmission line by controlling the distributed capacitance of the rose-cur...

A performance evaluation of selective mapping localised single carrier frequency division multiple access technique (SLM LSC-FDMA) is presented over channel measured at 30 GHz. These measurements were taken between three buildings under non-line-of-sight (NLOS) for a propagation path length of 183 m. Simulation results present a peak-to-average pow...

A novel compact bandpass filter based on linked hexagonal-omega resonators (LHORs) is presented. The proposed filter is realized by loading the LHORs to the microstrip line on the top of the substrate. The LHORs provides the possibility of designing bandpass filters with small size and simple structure. Two prototypes of filters were designed based...

This study reveals the interests towards the use of directional (D)-multiple-input and multiple-output (MIMO) setup as a potential solution to overcome the severe propagation loss of inherent line of sight (LOS) mm-waves communications in underground mine. To show the advantages of the proposed D-MIMO, two separate measurement campaigns are assesse...

Performance of a dual-band wearable button antenna is presented. The designed radiation structure has a metallic G-shaped layer connected with a cylindrical base through metallic cylindrical tube. The modeled design has the structure and the dimensions of a standard metallic cuff button. The proposed wearable antenna is designed to cover the dual I...

In this contribution, the On-body propagation measurements at 40m underground mine gallery and their statistical analysis are presented. Monopole antennas were installed on the body in order to form three on-body channels, namely belt-chest, belt-wrist and belt-head. The channel parameters of a 2 × 2 Multiple-Input Multiple-Output (MIMO) On-body sy...

A deterministic model based on ray tracing and dealing with periodic roughness is developed, for an indoor radio propagation channel and experimentally validated at a frequency of 10 GHz. Two different scenarios are studied, namely a smooth corridor and a corridor having artificial periodic roughness. The periodic roughness consists of a set of con...

The advantages of integrating beamforming Butler matrix in 4×4 Multiple-Input Multiple- Output (MIMO) systems for underground mine wireless communications in the 2.4GHz band are investigated. To satisfy both line-of-sight (LOS) and non-line-of-sight (NLOS) conditions, two separate measurement campaigns are performed in a real L-shaped underground m...

Adaptive modulation is an effective technique to make full use of wireless channel capacity and average spectral efficiency in multiple-input-multiple-output (MIMO) systems. Measured channel parameters performed in an underground mine environment at 2.4 GHz have been used in simulation tools based on Agilent SystemVue software. Two types of 2×2 MIM...

This study presents a new low-cost multiple-input multiple-output (MIMO) beam-pace technique to increase the overall link capacity of wireless MIMO communications systems in scatter-rich underground mines. This technique is based on generating multiple orthogonal beams for data spatial multiplexing using conformal cylindrical-shape patch arrays. He...

This article presents the design of a dual-band microstrip patch antenna. The proposed patch antenna is based on a novel metamaterial structure named the corrugated slotted-complementary split-ring resonators. By loading this new inclusion on the ground plane of a conventional patch antenna, a second resonance frequency can be created. The corrugat...

In underground environments, the safety of the miners depends on the quality of the used communication systems. Currently, wireless underground communications suffer from small-scale and large-scale fading, compromising the propagation quality and limiting the achieved bit rate. In this paper, the performance of a patch antenna set in off-body chan...

In this paper, a new model that combines the ray-tracing method and the uniform theory of diffraction (UTD) for accurate electromagnetic waves propagation characterization in stairwells at 10 GHz is proposed. The ray-tracing method was used to find all the possible reflected and diffracted waves from the stairs' surfaces and edges, respectively. Th...

In this paper, the off-body performance of a single-input single-output (SISO) system was evaluated in Non-Line-of-Sight (NLOS) situations and compared with measurements done with a clear Line of Sight (LOS) link. The obstructed link study takes into account the human shadowing effect, usually caused by close by miners interrupting the transmitter-...

This paper presents the performance of a patch antenna in an off-body channel within a mine gallery. A measurement campaign was performed in a gold mine in order to characterize the off-body channel by determining the channel parameters. Measurements were performed in the frequency domain using the Vector Network Analyzer (VNA). Hence, the channel...

In this paper, the on-body performance of three quasi-static channels was evaluated, when the human body undergoes certain typical movements. The main contribution of this work is the analysis of the impact of body movements on the performance of the on-body system in a mine environment. The quasi-static channels parameters were determined and comp...