Halim Boutayeb

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

In this work, two semianalytical methods are compared for computing the radiation characteristics of a Fabry–Perot cavity excited by an internal current line source. One method uses the ray launching and the other method uses the ray tracing. A full-wave method is used as a reference. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:13–...

FDTD course given at Ecole Polytechnique de Montreal since 2006. https://www.youtube.com/watch?v=f_Yl-2qqLMY&list=PLBtasiZs67jPm4PbYMaw7CtJPg2t2Q5_r&index=2

We propose a new type of mm wave beam steering antennas that permits larger steering angular range and almost no gain dispersion versus steering angle. Indeed, the limited angular range and the gain decrease when the steering angle increases are the main drawbacks of conventional planar phased arrays. The proposed design method starts with a substr...

This paper proposes a full-wave analysis of the Sagnac effect by using a direct Finite Difference Time Domain (FDTD) approach, where source, observer, and dielectric medium are moving. The Sagnac effect is employed in Global Positioning System (GPS) in order to obtain the correct location of a receiver. This effect occurs on the downlink time, join...

The finite-difference time-domain (FDTD) technique is applied for studying electromagnetic waves in the presence of different structures in motion: plane wave source (with low or high impedance), observation point, reflective plane surface, line source, and conducting wire illuminated by a plane wave. The movements are performed by changing the pos...

By using the finite‐difference time‐domain (FDTD) method and a two‐port network model, this letter investigates the response of a uniformly moving resistive sheet to illuminating electromagnetic plane waves, at normal incidence. The numerical Doppler frequency shifts and scattering matrix are matched with curve‐fitting expressions. The effects of m...

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...

A numerical investigation of moving dielectric interface and dielectric slab illuminated by plane electromagnetic waves, using the finite-difference time-domain (FDTD) technique, is presented. Within the FDTD time loop, motions are obtained by shifting the locations of structures at particular times. The transmitted and reflected waves are studied,...

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...

Electromagnetic problems with moving structures are considered. For objects moving at a uniform velocity, the most popular technique used in the literature consists of a change of the reference frame and the utilization of Lorentz transformation of Maxwell's electric and magnetic fields and Voigt-Lorentz transformations of space and time variables....

The study of electromagnetic scattering from aircraft has an important application for the development of stealth technology. The implementation of motion in such problems can allow the analysis of the Doppler effect along with the radar cross-section of a target simultaneously. This paper proposes a method based on the finite-difference time-domai...

Abstract—This paper presents the design of a Yagi antenna array fed by a Substrate-Integrated Waveguide (SIW) in TE50 mode, specifically tailored for a frequency of 5.8 GHz. This study contributes to the advancement of Yagi antenna technology by introducing an innovative approach based on the utilization of SIW waveguide in TE50 mode. This innovati...

This letter introduces a spatially distributed wireless interferometric receiver that leverages wave correlations for baseband symbol extraction. Various PSK and QAM modulation schemes operating at 5 GHz are implemented and tested alongside fast logarithmic power detectors. Experimental results demonstrate the receiver’s potential, achieving a data...

This paper proposes an original and thorough analysis of the behavior of electromagnetic waves in the presence of moving bodies by using the finite difference time domain (FDTD) method. Movements are implemented by changing positions of the objects at each time step, through the classical FDTD time loop. This technique is suitable for non-relativis...

video: https://www.youtube.com/watch?v=qNOAnSQvhe4&t=3992s The analysis of electromagnetic problems with moving objects has many applications: RF Doppler radars, astrophysics, GPS, electromagnetic gyroscopes… This seminar proposes an original and thorough analysis of the behavior of electromagnetic waves in the presence of moving bodies by using t...

Youtube video: https://youtu.be/BnGZV5gi7cU?si=dOfnUQ0eWoHEO2Qk Lorentz, Minkowski, Searle, Larmor, Heaviside, Mach, Tesla, Rutherford, Essen, Dirac, Wesley, Engelhardt

Youtube video: https://youtu.be/Sx-nzzofVlA?si=91TYaI02KVBDuhpb The concept of "relative motion" is enough to understand many physical phenomena in mechanics and electromagnetism. Galileo's work was about inertia not "relativity". "Relativity" does not have a clear meaning. It is mainly used as a justification for the utilization of "Lorentz transf...

This paper presents an electromagnetic analysis of a moving infinitely long line source illuminating an infinitely long metallic wire at rest. The study uses the full‐wave numerical finite difference time domain (FDTD) method, which is based on the spatial and temporal discretization of Maxwell's equations. Movement is computed within the FDTD tech...

Wolfgang Engelhardt sent to me this file in 2019. I was working on new formulas of the Doppler effects for moving bodies in order to explain the results of Michelson-Morley experiment. Engelhardt explained to me that Voigt was pursuing the same approach and that this approach was wrong. He told me that he re-analyzed Voigt paper entitled “Theory of...

In this work, the finite‐difference time‐domain (FDTD) method is employed to study electromagnetic problems with moving bodies in a moving system. The proposed approach consists in modeling objects with time‐varying positions and using the direct discretization of Maxwell's equations in space and time domains. Doppler effects are investigated for p...

Parabolic reflector (PR) antennas are commercially applied to the two Wi-Fi frequencies of 2.4 and 5 GHz in this conference paper. For the generation of vortex waves, a high gain and directive antenna structure is proposed here with PR. It is a unique feature of electromagnetic (EM) waves to have vortex or orbital angular momentum (OAM). OAM techni...

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...

This paper proposes a transmit electromagnetic surface based on piano board configuration, which can realize two different multi-beam radiation patterns with orthogonal polarizations independently. A Dual Linearly Polarized (DLP) microstrip antenna is designed to excite the metasurface with a 27 GHz to 29 GHz operating frequency band. The structure...

This work proposes an original analysis of the illumination by electromagnetic plane waves of moving metallic cylinders and moving dielectric cylinders. Full-wave numerical investigations are carried out by using the Finite Difference Time Domain (FDTD) method. The implementation of motions is done by changing the positions of bodies at each cycle...

By using the Finite Difference Time Domain method, this work proposes an original analysis concerning electromagnetism with moving bodies. An ideal plane wave source is modeled with a plane of current sources, whereas a matched plane wave source is modeled with current sources and resistors matched to free space. Numerical full-wave simulations sho...

The response of a uniformly moving metallic slab to an electromagnetic plane wave, at normal incidence, is studied. The analysis is based on the application of boundary conditions to Maxwell's equations as a function of time. The Doppler effect and amplitude of the obtained reflected wave agree with the literature. Moreover, a transferred wave whic...

By using the Finite Difference Time Domain (FDTD) method, this paper presents an original analysis of electromagnetic problems with moving bodies. In our FDTD program, movements are implemented by changing positions of the objects at different time instants, through the classical FDTD time loop. With this direct approach, time is implicitly absolut...

https://events.vtools.ieee.org/m/362157 The analysis of electromagnetic problems with moving objects has many applications: RF Doppler radars, astrophysics, GPS, electromagnetic gyroscopes… This seminar proposes an original and thorough analysis of the behavior of electromagnetic waves in the presence of moving bodies by using the Finite Differenc...

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...

Link to the presentation (YouTube): https://youtu.be/snMH2kdGHXg This seminar proposes an original and thorough analysis of the behavior of electromagnetic waves in the presence of moving bodies by using the Finite Difference Time Domain (FDTD) method. Movements are implemented by changing positions of the objects at each time step, through the c...

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...

A thorough analysis of the behavior of electromagnetic waves in the presence of moving bodies is proposed using the numerical Finite Difference Time Domain (FDTD) method. In this work, the effect of movement of the observation point, plane wave source, and scatterer bodies on the frequency and amplitude of the reflected waves are studied for the ca...

We propose an original and detailed investigation of a moving dielectric half-space with oblique plane wave incidence, by using the Finite Difference Time Domain (FDTD) method. In our FDTD program, movements are implemented by changing positions of the interfaces at different time instants, through the classical FDTD time loop. With this "brute-for...

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, a new class of circularly polarized (CP) antennas is presented. It is based on the utilization of stacked printed circuit boards (PCBs) in order to realize a quasi-helix. An end-cap disk is used to optimize the axial ratio. Good impedance matching and low axial-ratio (AR) in a wide frequency band make the proposed antenna an excellen...

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...

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...

The disclosed structures and methods are directed to antenna systems configured to transmit and receive a wireless signal in and from different directions. A switchable lens antenna has excitation ports radiating radio-frequency (RF) wave into a parallel-plate waveguide structure, and a frequency selective structure (FSS). The antenna presented her...

A switchable artificial magnetic conductor (S-AMC) element that includes a conductive layer, a conductive patch located on one side of the conductive layer and electrically isolated from the conductive layer, and an open stub located on an opposite side of the conductive layer and electrically isolated from the conductive layer. A switch element is...

The disclosed structures and methods are directed to transmission and reception of a radio-frequency (RF) wave. An antenna comprises a stack-up structure having a first control layer, a second control layer, a first and a second parallel-plate waveguides, and a plurality of through vias. The antenna further comprises a first central port and a seco...

The disclosed structures and methods are directed to antenna systems configured to transmit and receive a wireless signal in and from different directions. An antenna structure comprises a pair of horizontal-polarization (HP) antenna units forming a first parallel-plate waveguide. One of the HP antenna units and a base unit form a second parallel-p...

A technique is proposed for designing multi-band and/or wide band printed quadrifilar helical antennas. This technique uses a microstrip line tuning section in the vicinity of the feeding ports. This section contains an elongated body and a tail member extending away from the body. A geometry of the tail member is selected for modifying an impedanc...

Future Access Points (APs) for Wireless Local Area Network (WLAN) systems require more streams to enhance channel capacity by using Multiple Inputs Multiple Outputs (MIMO) techniques. Furthermore, antennas with reconfigurable patterns can increase significantly the communication throughput. It is a great challenge to integrate more reconfigurable a...

We present a new cost-effective technique for designing mm wave dual linearly polarized end-fire antennas and antenna arrays using multi-layer printed circuit boards. For vertical polarization (VP) we propose a modified inverted F antenna with plated through holes. Horizontal polarization (HP) is obtained with quasi Yagi-Uda printed dipole. VP and...

A switchable artificial magnetic conductor (S-AMC) element that includes a conductive layer, a conductive patch located on one side of the conductive layer and electrically isolated from the conductive layer, and an open stub located on an opposite side of the conductive layer and electrically isolated from the conductive layer. A switch element is...

An antenna that includes a radial waveguide defining a waveguide region between opposed first and second surfaces. A radio frequency (RF) probe is disposed in the waveguide region for generating RF signals, and a plurality of radiating slot antenna elements are disposed on the first surface for emitting the RF signals from the waveguide region. A p...

A multi-band single feed dielectric resonator antenna (DRA) and DRA array are provided. The DRA is made of a dielectric material having a first and second antenna regions wherein the second antenna region has a different dielectric constant than the first antenna region. The dielectric material is supported by a feeding substrate. The feeding subst...

A radio frequency ( RF ) antenna array that includes a first antenna unit that operates at a first frequency band and includes three antenna elements that are collocated on a reflector element , each of the three antenna elements having a different polarization direction than the other two antenna elements of the first antenna unit . A first switch...

We show that the null result in Michelson-Morley experiment can be predicted without using a postulate of constancy of the speed of light. Like any the velocity, the speed of light is relative. We derive a general form of Doppler's principle by using wave vectors (a method similar to Klinaku's approach) for phase shift and by using the wave equatio...

In our analysis based on Klinaku-Doppler effect, it is important that we distinguish between frequency shift and phase shift. Depending on the context, either the frequency is shifted or the phase is shifted. Usually we say that there is a Doppler effect only if there is a change of frequency. In general Doppler's principle we should include both:...

Hippolyte Fizeau carried out in 1851 an experiment to measure the relative speeds of light in moving water. As shown by Hendrick Lorentz, Ether stays immobile in the experiment. In order to obtain the phase velocity of the wave due to the motion of water, Lorentz used his concept of "local time". In the wave theory, it is natural to work with the f...

In order to take into account the motion of matter in electrodynamics, Hendrik Lorentz chose to develop Maxwell’s equations with an additional space-time transformation, called Lorentz Transformation (LT). Inspired by a paper from Woldemar Voigt, Lorentz developed this transformation after analyzing and predicting the results of several experiments...

We derive Klinaku-Doppler effect formula by using the convective wave equation.

We analyze the convective form of Maxwell's equations that we obtained previously and we show that our result is in agreement with a usual formula used in physics of particle accelerators.

We try to see if we can predict the result of the Mossbauer rotor experiment by using our convective form of Maxwell's equations.

We consider the frequency domain form of Maxwell's equations, Cartesian coordinates, and we use the general Doppler Effect formula to derive the convective form of Maxwell's equations in frequency domain. The solutions in time domain are obtained by using inverse Fourier transform.

We will complete this analysis further later but we can note already several interesting points: if we suppose that the source radiates at all wavelengths with the same amplitude, the motion of the system relatively to the medium of propagation for light spreads the power non uniformly in the spectrum. We can conclude from this analysis that the bl...

https://meetings.vtools.ieee.org/m/188593 This IEEE seminar presents two examples of research subjects pursued at the Antenna Department of Huawei Technologies in Ottawa. The first part of the presentation concerns sub 6 GHz bands for Wireless Local Area Network (WLAN) access points; and the second part deals with 5G (Fifth-Generation) millimeter-...

We are analyzing some applications of the general Doppler effect formula

Voigt was right about Michelson-Morley experiment. Shukri Klinaku resolved a century-old problem thanks to Al-Kashi’s theorem. Wolfgang Engelhardt was right when he proposed to develop a new convective form of Maxwell’s equations to replace the incorrect relativistic form. We consider in this letter that only if there is a relative motion between t...

A combination antenna element is provided. A first antenna element, for example a waveguide antenna, may be coupled to a waveguide feed such as a Substrate Integrated Waveguide (SIW). The waveguide antenna may be formed as an aperture at a terminus of the SIW and disposed within a Printed Circuit Board (PCB) internal layer. A second