Skip to main content

Ali GHARSALLAH

Followers

24

Following

20

Co-author

1

Public Views

Mursyidul Sabran

Universiti Teknologi Malaysia - UTM

Muhammad Faqieh Ali

Prince Kumar Yadav

Interests

Uploads

Papers by Ali GHARSALLAH

Efficient 2.45 GHz Rectenna Design with High Harmonic Rejection for Wireless Power Transmission

The purpose of this work is to propose an efficient microstrip rectenna operating on ISM band wit... more The purpose of this work is to propose an efficient microstrip rectenna operating on ISM band with high harmonic rejection. The receiving antenna with proximity coupled feeding line implemented in a multilayer substrate. The rectenna with integrated circular sector antenna can eliminate the need for an low pass filter (LPF) placed between the antenna and the diode as well as produce higher output power, with maximum conversion efficiency of 74% using a 1300 Ω load resistor at a power density of 0.3 mW/cm².

Design and Implementation of a Tri-Band Miniaturized Planar Inverted-F Antenna with Double Resonator for GPS Application

Engineering, Technology & Applied Science Research, Dec 1, 2019

In this paper, a new planar inverted-F antenna is presented for GNSS applications and the DCS ban... more In this paper, a new planar inverted-F antenna is presented for GNSS applications and the DCS band. The proposed antenna structure is based on capacitive slots that achieve multiband behavior. The antenna has two resonators of dimensions (31mm×17mm×0.35mm) and (20.5mm×17.5mm× 0.35mm), a ground plane (60mm×17.5mm×0.35mm) and 6.5mm height. A prototype was implemented and good agreement was noticed between the simulation and test results, indicating three resonant frequencies, namely 1.176GHz, 1.8GHz and 2.8GHz. Radiation characteristics and diversity performance of the proposed structure is presented with detail.

Direction of Arrival Estimation Method Using a 2-L Shape Arrays Antenna

Electromagnetic waves, 2007

The paper presents a new algorithm for a 2-dimensionnal direction of arrival estimation. Based on... more The paper presents a new algorithm for a 2-dimensionnal direction of arrival estimation. Based on the extended Kalman filter (EKF), we analyse a recursive procedure for 2-dimensional directions of arrival (DOA) estimation and we will employ the two-L-shape arrays. A new space-variable model which we call a spatial state equation is presented using array element locations and incident angles. In this paper we briefly recapitulate the most important features of the extended Kalman filter (EKF). The performance of the proposed approach is examined by a simulation study with three signals model. The simulation results show a good estimate performance.

Frequency Extended-MUSIC Method for DOA Estimation in Indoor IR-UWB Environment

American Journal of Applied Sciences, 2016

In recent years, many researchers have been developed in order to ensure an accurate localization... more In recent years, many researchers have been developed in order to ensure an accurate localization. So many techniques have been used the direction of arrival to estimate and track of IR-UWB signals. In this study, we propose a new direction of arrival estimation method for impulse radio UWB signals. This technique based on Extended-MUSIC algorithm. The proposed method has high performances in the multipath channels. Simulation results show that it has more accuracy then others high resolution algorithms, moreover, It is compared the performance corresponding to the Cramer-Rae bound (CRB).

Cost-effective and Green Manufacturing Substrate Integrated Waveguide (SIW) BPF for Wireless Sensor Network Applications

International Journal of Advanced Computer Science and Applications, 2016

This paper presents a comparison between innovative technique for implementation of substrate int... more This paper presents a comparison between innovative technique for implementation of substrate integrated waveguide band pass filter centered at 4 GHz and conventional PCB results. Two poles filter is designed, simulated and fabricated. The novel fabrication process technique is based on green manufacturing where physical etching of metal layer of aluminum is glued on paper substrate. The pass band filter is composed of two resonant adjacent and symmetric cavities separated by a coupling iris. The same topology is adopted with conventional substrate and PCB technology to validate the new technique results. The bandwidth achieved is almost four times wider than found with PCB technology developed for UWB applications. The proposed technique keeps the advantages of conventional SIW technology including low profile, compact size, complete shielding, easy fabrication, low cost for mass production as well as convenient integration with planar waveguide components including transitions. Moreover, the flexible quality of paper offer the possibility to fabricate conformal shapes of SIW components which is not possible with conventional rigid substrates made with PCB technology. In addition to the advantages of eco friendly, renewable, light weight , and ultra low cost materials.

Comparison of Uniform and Non-Uniform SIW CRLH LW antennas

2019 Antennas Design and Measurement International Conference (ADMInC), 2019

This paper presents the results and investigation of substrate integrated waveguide (SIW) leaky-w... more This paper presents the results and investigation of substrate integrated waveguide (SIW) leaky-wave antenna (LWA) based on the composite right/left-handed (CRLH) structure designed for X band applications. The interest is given to two antenna types: uniform CRLH antenna, non-uniform CRLH antenna where three balanced CRLH unit cells are used in the design. Results of both structures show that a wide scanning range over the frequency bandwidth from 9 to 13.4 GHz is obtained. The side lobe level is remarkably decreased in the non-uniform structure especially around the broadside area which is suitable for many scanning applications.

Study of the Electromagnetic scattering by a metall ic object of arbitrary shape

In this paper, the Wave Concept Iterative Procedur e WCIP is presented [1-2]. The formulation is ... more In this paper, the Wave Concept Iterative Procedur e WCIP is presented [1-2]. The formulation is developed to analyse scattering metallic objects of arbitrary shape. We test it in the case of scattering by an infinite metalli c cylinder with a square section. We observe a good agreement between the results derived from WCIP and Multi Resolution Time Domain MRTD [3].

Comparative Study on Different Dual-BandHIS Structures

International Journal of Advanced Research in Electrical, Electronics and Instrumentation Energy, 2015

In this paper, we present a comparative study of two different dual-band high impedance surfaces ... more In this paper, we present a comparative study of two different dual-band high impedance surfaces (HIS) to be used as ground planes. These structures are designed to behave as a magnetic conductor surface for global positioning system (GPS) standard frequencies L1 (1575 MHz) and L2 (1227 MHz). Each of the two surfaces is characterized by performing parametric studies of its unit cell. The studies were carried out using CST Microwave Studio Simulation software. The results show that the two-layer cell gives the best bandwidth for high and low frequency bands.

Designs of Frequency Reconfigurable Planar Bow-tie Antenna Integrated with PIN, varactor diodes and Parasitic Elements

Advances in Science, Technology and Engineering Systems Journal, 2021

This paper presents the designs and the simulations of proposed structures of electronically freq... more This paper presents the designs and the simulations of proposed structures of electronically frequency reconfigurable planar bow-tie antenna. In the first part, a modified wide band self-complementary bow-tie antenna is designed and implemented. In the second part, varactor and PIN diodes are integrated in top side to adjust electronically the modified structure of bow-tie antenna over multi-band frequency. By adjusting PIN diode between the two states and by tuning the varactor diode inside these two states; the proposed antenna demonstrates two different operational frequencies. In ON state, the antenna covers a narrow frequency bands and in OFF state the antenna demonstrates a wide-band operational frequency. Furthermore, a new structure of reconfigurable antenna implemented with PIN diode and two hexagonal parasitic elements is developed to realize a multi-band operational frequency band and to cover GPS and GMS bands. Simulated results show a return loss less than-10dB with a gain varied between 0.5 and 3.5dB.

A Calibrating Six-Port Compact Circuit using a New Technique Program

International Journal of Advanced Computer Science and Applications, 2019

In this paper, a calibration of six-port reflectometer using a new technique program is presented... more In this paper, a calibration of six-port reflectometer using a new technique program is presented. It has been shown that a calibration procedure is based on explicit method, the method that capturing the output wave forms of sixport junction and determines the complex relationship between the two waves present at the input from the value of four outputs. The number of calibrating standards and the computation effort required are the most important parameters in selecting a calibration technique. Comparison between the results obtained from the new calibration method program with measurement results show the validity of the method proposed. This calibration technique can be used in general six-port direct digital receiver.

Detection of Parkinson's Disease through Acoustic Parameters

International Journal of Advanced Computer Science and Applications, 2018

Parkinson's disease is a neurological disorder. It is the second most common disease after Alzhei... more Parkinson's disease is a neurological disorder. It is the second most common disease after Alzheimer's. Incidence rates for this disease are increasing rapidly with increasing life expectancy. The search for measures to diagnose the disease and monitor symptoms is an important step, despite the fact that it presents a number of challenges. Among the symptoms related to this disease is the disturbances of the voice which particularly occur in a remarkable way called hypokinetic dysarthria which is presented by the poverty of the gesture in all the characteristics of the speech (phonatory, prosodic, articulatory and rhythm). Our goal is to do a study based on voice analysis at the level of the glottis to examine some early parameters measured using the LF model and clinical manifestations to help diagnosis of the disease.

An Electrical Model to U-Slot Patch Antenna with Circular Polarization

International Journal of Advanced Computer Science and Applications, 2017

The microstrip antenna is one of the best antenna structures, due to its low cost and compact des... more The microstrip antenna is one of the best antenna structures, due to its low cost and compact design. In this paper, a coaxial feed circularly polarized square patch antenna is designed using the U-slot. The proposed antenna is suited for the RFID readers in the SHF band. This structure of antenna of FR-4 substrate (dielectric constant = 3.5), is capable to cover the range of frequency of 2.4 to 2.5GHz. The size of patch is 25*25 mm 2. An equivalent electrical model of this antenna was proposed and simulated by the ADS software. The simulated gain is 4.189 dBi and S 11 bandwidth is about 100 MHz. Analysis and modeling of the proposed antenna was carried out using the CST and HFSS simulator based on the finite element method. The simulation results obtained are presented and discussed.

Novel Conception of a Tunable RF MEMS Resonator

International Journal of Advanced Computer Science and Applications, 2017

This paper presents a new monolithic microwave integrated circuit (MMIC) based on coplanar wavegu... more This paper presents a new monolithic microwave integrated circuit (MMIC) based on coplanar waveguide (CPW) design for a tunable resonator based on RF MEMS. This RF structure, which can be used for system on chip (SOC), is constituted with MEMS Bridge placed between two meander inductors and the tenability is controlled by a variable applied DC voltage. Moreover, this device presents a compactness characteristic and the possibility to operate at high frequencies. The resonant frequency and the bandwidth can be changed easily by changing the bridge gap of the RF MEMS. The numerical simulations of this novel structure of a tunable RF MEMS resonator were performed with the electromagnetic solvers CST MWS (Computer simulation Technology Microwave Studio) and validated by the more accurate electromagnetic solver HFSS (High Frequency Structural Simulator). The simulation results, for three different spacing of the bridge gap, show that the tunable frequency band are between 10 and 40 GHz with the two electromagnetic solvers and exhibiting three resonant frequencies (21, 23.1 and 24.6 GHz).The simulation results of the return loss using CST achieves 29 dB with an insertion loss less than 1 dB; However, the HFSS simulation shows similar performance in the resonant frequencies and in the bandwidth giving better results in terms of the return loss (about 35dB instead of 29 dB) and showing a good adaptation.

Modelling the Interaction between the Antenna and the Human Head by the Technique of Artificial Neural Network

American Journal of Engineering and Applied Sciences, 2015

The purpose of this study is the study and modeling of phenomenon 'interaction between the antenn... more The purpose of this study is the study and modeling of phenomenon 'interaction between the antenna and the human body' by the Artificial Neural Network (ANN). This technique is based on mathematical formulations and a base of learning who took simulations by noted trade CST MS. An example of the interaction between a body, which the dielectric properties are given and a dipole antenna, has been studied. The results validate the new approach. The good agreement between the results of the given simulation published justifies the modeling process and validates the current approach of the analysis.

Characterization of UWB antipodal Tapered Slot Antenna using Wave Concept Iterative Procedure

2015 1st URSI Atlantic Radio Science Conference (URSI AT-RASC), 2015

Analysis and design of electromagnetic band gap structures with stratified and inhomogeneous media

Optics Communications, 2010

ABSTRACT In this study, a generalized and easy to use method based on Hill&#39;s equation and... more ABSTRACT In this study, a generalized and easy to use method based on Hill&#39;s equation and chain matrix concept is used to analyze the electromagnetic wave propagation in stratified dielectric and inhomogeneous media with arbitrary profiles.Numerical simulations are performed to compute the reflection and transmission of several Electromagnetic Bandgap (EBG) structures for various permittivity profiles and given polarization as well as incidence angles of driving fields.Multilayer structures are analyzed and optimized to enhance their selectivity performances. Obtained results agree excellently well with other published data.

Online tracking of coherent signals over multiple-input multiple-output code division multiple access communication channel using JADE–Capon method in conjunction with iterative space–time lifting preprocessing scheme

IET Wireless Sensor Systems, 2012

The main motivation for this work is how to handle the circumvent problem encountered in decorrel... more The main motivation for this work is how to handle the circumvent problem encountered in decorrelating perfect coherent multipath signals over MIMO-CDMA channel with small number of sensors and few data snapshots. The authors propose a new iterative space-time lifting preprocessing (ISTLP) decorrelating scheme that guarantees a perfect decorrelating of a great number of impinging signals even when they are fully correlated and overlaying in space and time domains. It is based on exploiting iteratively the spatial and temporal redundancies arising from multiple antennas and multiple slots. The temporal lifting scheme is introduced first, for efficient tracking and cancelling of ISI, MAI and noise effects within the bank of the N-tapped-delay-lines associated with the user of interest. Secondly, this iterative multi-resolution approach will be coupled to a preprocessing scheme to allow easy transformation of resulting temporal-lifted covariance matrix from time domain to an equivalent Vandermonde structure in frequency domain to be exploited in spatial lifting step. Two detection criteria are therefore established to attempt the convergence state in ISTLP algorithm. Finally, a JADE-Capon method based on ST-MVDR beamformer is applied to the spatial-temporal-lifted preprocessed covariance matrix to compute the joint azimuth-direction-of-arrival and delay of desired K i multipath signals. The efficacy and high resolution capability of the proposed estimation approach is supported by numerical simulation results.

Frequency Domain Extended-MUSIC Algorithm for TOA Estimation in Indoor UWB Radio Impulse Channels

International Journal of Computer Applications, 2014

Several indoor localization systems have grown considerably, in order to obtain a high performanc... more Several indoor localization systems have grown considerably, in order to obtain a high performance in dense multipath propagation channels. Many studies have been done in this area. Different methods have been proposed based on the use of Impulse Radio Ultra Wide band (IR-UWB) signals. These systems are usually based on time of arrival estimation using different algorithms. In this paper, a new time of arrival estimation algorithm is proposed for impulse radio UWB systems, which is based on the EXTENDED-MUSIC algorithm. Furthermore, Simulation results show these performances in multipath channels. The proposed method is compared with other high resolution algorithms such as Multiple SIGNAL Classification (MUSIC), estimation of signal parameters via rotational invariance technique (ESPRIT) and the MATRIX PENCIL method. Simulation will justify the high accuracy and resolution localization capabilities of the proposed algorithm.

Estimation Itérative des Directions d'Arrivée de Sources

Cet article propose une nouvelle méthode de sous-espaces pour l'estimation d'angles d'arrivée de ... more Cet article propose une nouvelle méthode de sous-espaces pour l'estimation d'angles d'arrivée de signaux provenant de sources, émettrices et reçus sur un réseau de capteurs, sous l'hypothèse que les signaux sont a bande étroite et non corrélés sur une antenne rectiligne uniforme. Elle repose sur la détermination itérative du sous espace bruit (ou source) à partir d'un opérateur linéaire extrait de la matrice des vecteurs propres associés au sous-espace bruit (ou source) obtenu à l'itération précédente. Cet algorithme est initialisé à partir de la décomposition en sous espace source-sous espace bruit obtenue à partir soit des éléments propres de la matrice interspectrale des signaux mesurés sur l'antenne (cf. méthode MUSIC) soit à partir d'un opérateur linéaire extrait de la matrice interspectrale (cf. méthode du Propagateur). Cet article annonce une amélioration des performances en termes de résolution et de précision d'estimation au fur et à mesure des itérations.

Characterization of Microstrip Ring with a Narrow Gap by an Iterative Method

International Journal of Microwave Science and Technology, 2008

This paper presents an implementation of an iterative method based on the wave's concept, for... more This paper presents an implementation of an iterative method based on the wave's concept, for analysing a ring resonator. This method includes a two-dimensional fourier modal transformation (2D-FMT) in a wave guide environment. The method has the advantage of simplicity in that it does not involve basis functions and inversion of matrices, as used in other calculation methods. Therefore, it is capable of analyzing larger bodies than other classical techniques. An implementation of the iterative calculation is shown for the extraction ofSparameters of microwave components. The good agreement between simulation results and experimental published data justifies the design procedure and validates the present analysis approach.

Efficient 2.45 GHz Rectenna Design with High Harmonic Rejection for Wireless Power Transmission

The purpose of this work is to propose an efficient microstrip rectenna operating on ISM band wit... more The purpose of this work is to propose an efficient microstrip rectenna operating on ISM band with high harmonic rejection. The receiving antenna with proximity coupled feeding line implemented in a multilayer substrate. The rectenna with integrated circular sector antenna can eliminate the need for an low pass filter (LPF) placed between the antenna and the diode as well as produce higher output power, with maximum conversion efficiency of 74% using a 1300 Ω load resistor at a power density of 0.3 mW/cm².

Design and Implementation of a Tri-Band Miniaturized Planar Inverted-F Antenna with Double Resonator for GPS Application

Engineering, Technology & Applied Science Research, Dec 1, 2019

In this paper, a new planar inverted-F antenna is presented for GNSS applications and the DCS ban... more In this paper, a new planar inverted-F antenna is presented for GNSS applications and the DCS band. The proposed antenna structure is based on capacitive slots that achieve multiband behavior. The antenna has two resonators of dimensions (31mm×17mm×0.35mm) and (20.5mm×17.5mm× 0.35mm), a ground plane (60mm×17.5mm×0.35mm) and 6.5mm height. A prototype was implemented and good agreement was noticed between the simulation and test results, indicating three resonant frequencies, namely 1.176GHz, 1.8GHz and 2.8GHz. Radiation characteristics and diversity performance of the proposed structure is presented with detail.

Direction of Arrival Estimation Method Using a 2-L Shape Arrays Antenna

Electromagnetic waves, 2007

The paper presents a new algorithm for a 2-dimensionnal direction of arrival estimation. Based on... more The paper presents a new algorithm for a 2-dimensionnal direction of arrival estimation. Based on the extended Kalman filter (EKF), we analyse a recursive procedure for 2-dimensional directions of arrival (DOA) estimation and we will employ the two-L-shape arrays. A new space-variable model which we call a spatial state equation is presented using array element locations and incident angles. In this paper we briefly recapitulate the most important features of the extended Kalman filter (EKF). The performance of the proposed approach is examined by a simulation study with three signals model. The simulation results show a good estimate performance.

Frequency Extended-MUSIC Method for DOA Estimation in Indoor IR-UWB Environment

American Journal of Applied Sciences, 2016

In recent years, many researchers have been developed in order to ensure an accurate localization... more In recent years, many researchers have been developed in order to ensure an accurate localization. So many techniques have been used the direction of arrival to estimate and track of IR-UWB signals. In this study, we propose a new direction of arrival estimation method for impulse radio UWB signals. This technique based on Extended-MUSIC algorithm. The proposed method has high performances in the multipath channels. Simulation results show that it has more accuracy then others high resolution algorithms, moreover, It is compared the performance corresponding to the Cramer-Rae bound (CRB).

Cost-effective and Green Manufacturing Substrate Integrated Waveguide (SIW) BPF for Wireless Sensor Network Applications

International Journal of Advanced Computer Science and Applications, 2016

This paper presents a comparison between innovative technique for implementation of substrate int... more This paper presents a comparison between innovative technique for implementation of substrate integrated waveguide band pass filter centered at 4 GHz and conventional PCB results. Two poles filter is designed, simulated and fabricated. The novel fabrication process technique is based on green manufacturing where physical etching of metal layer of aluminum is glued on paper substrate. The pass band filter is composed of two resonant adjacent and symmetric cavities separated by a coupling iris. The same topology is adopted with conventional substrate and PCB technology to validate the new technique results. The bandwidth achieved is almost four times wider than found with PCB technology developed for UWB applications. The proposed technique keeps the advantages of conventional SIW technology including low profile, compact size, complete shielding, easy fabrication, low cost for mass production as well as convenient integration with planar waveguide components including transitions. Moreover, the flexible quality of paper offer the possibility to fabricate conformal shapes of SIW components which is not possible with conventional rigid substrates made with PCB technology. In addition to the advantages of eco friendly, renewable, light weight , and ultra low cost materials.

Comparison of Uniform and Non-Uniform SIW CRLH LW antennas

2019 Antennas Design and Measurement International Conference (ADMInC), 2019

This paper presents the results and investigation of substrate integrated waveguide (SIW) leaky-w... more This paper presents the results and investigation of substrate integrated waveguide (SIW) leaky-wave antenna (LWA) based on the composite right/left-handed (CRLH) structure designed for X band applications. The interest is given to two antenna types: uniform CRLH antenna, non-uniform CRLH antenna where three balanced CRLH unit cells are used in the design. Results of both structures show that a wide scanning range over the frequency bandwidth from 9 to 13.4 GHz is obtained. The side lobe level is remarkably decreased in the non-uniform structure especially around the broadside area which is suitable for many scanning applications.

Study of the Electromagnetic scattering by a metall ic object of arbitrary shape

In this paper, the Wave Concept Iterative Procedur e WCIP is presented [1-2]. The formulation is ... more In this paper, the Wave Concept Iterative Procedur e WCIP is presented [1-2]. The formulation is developed to analyse scattering metallic objects of arbitrary shape. We test it in the case of scattering by an infinite metalli c cylinder with a square section. We observe a good agreement between the results derived from WCIP and Multi Resolution Time Domain MRTD [3].

Comparative Study on Different Dual-BandHIS Structures

International Journal of Advanced Research in Electrical, Electronics and Instrumentation Energy, 2015

In this paper, we present a comparative study of two different dual-band high impedance surfaces ... more In this paper, we present a comparative study of two different dual-band high impedance surfaces (HIS) to be used as ground planes. These structures are designed to behave as a magnetic conductor surface for global positioning system (GPS) standard frequencies L1 (1575 MHz) and L2 (1227 MHz). Each of the two surfaces is characterized by performing parametric studies of its unit cell. The studies were carried out using CST Microwave Studio Simulation software. The results show that the two-layer cell gives the best bandwidth for high and low frequency bands.

Designs of Frequency Reconfigurable Planar Bow-tie Antenna Integrated with PIN, varactor diodes and Parasitic Elements

Advances in Science, Technology and Engineering Systems Journal, 2021

This paper presents the designs and the simulations of proposed structures of electronically freq... more This paper presents the designs and the simulations of proposed structures of electronically frequency reconfigurable planar bow-tie antenna. In the first part, a modified wide band self-complementary bow-tie antenna is designed and implemented. In the second part, varactor and PIN diodes are integrated in top side to adjust electronically the modified structure of bow-tie antenna over multi-band frequency. By adjusting PIN diode between the two states and by tuning the varactor diode inside these two states; the proposed antenna demonstrates two different operational frequencies. In ON state, the antenna covers a narrow frequency bands and in OFF state the antenna demonstrates a wide-band operational frequency. Furthermore, a new structure of reconfigurable antenna implemented with PIN diode and two hexagonal parasitic elements is developed to realize a multi-band operational frequency band and to cover GPS and GMS bands. Simulated results show a return loss less than-10dB with a gain varied between 0.5 and 3.5dB.

A Calibrating Six-Port Compact Circuit using a New Technique Program

International Journal of Advanced Computer Science and Applications, 2019

In this paper, a calibration of six-port reflectometer using a new technique program is presented... more In this paper, a calibration of six-port reflectometer using a new technique program is presented. It has been shown that a calibration procedure is based on explicit method, the method that capturing the output wave forms of sixport junction and determines the complex relationship between the two waves present at the input from the value of four outputs. The number of calibrating standards and the computation effort required are the most important parameters in selecting a calibration technique. Comparison between the results obtained from the new calibration method program with measurement results show the validity of the method proposed. This calibration technique can be used in general six-port direct digital receiver.

Detection of Parkinson's Disease through Acoustic Parameters

International Journal of Advanced Computer Science and Applications, 2018

Parkinson's disease is a neurological disorder. It is the second most common disease after Alzhei... more Parkinson's disease is a neurological disorder. It is the second most common disease after Alzheimer's. Incidence rates for this disease are increasing rapidly with increasing life expectancy. The search for measures to diagnose the disease and monitor symptoms is an important step, despite the fact that it presents a number of challenges. Among the symptoms related to this disease is the disturbances of the voice which particularly occur in a remarkable way called hypokinetic dysarthria which is presented by the poverty of the gesture in all the characteristics of the speech (phonatory, prosodic, articulatory and rhythm). Our goal is to do a study based on voice analysis at the level of the glottis to examine some early parameters measured using the LF model and clinical manifestations to help diagnosis of the disease.

An Electrical Model to U-Slot Patch Antenna with Circular Polarization

International Journal of Advanced Computer Science and Applications, 2017

The microstrip antenna is one of the best antenna structures, due to its low cost and compact des... more The microstrip antenna is one of the best antenna structures, due to its low cost and compact design. In this paper, a coaxial feed circularly polarized square patch antenna is designed using the U-slot. The proposed antenna is suited for the RFID readers in the SHF band. This structure of antenna of FR-4 substrate (dielectric constant = 3.5), is capable to cover the range of frequency of 2.4 to 2.5GHz. The size of patch is 25*25 mm 2. An equivalent electrical model of this antenna was proposed and simulated by the ADS software. The simulated gain is 4.189 dBi and S 11 bandwidth is about 100 MHz. Analysis and modeling of the proposed antenna was carried out using the CST and HFSS simulator based on the finite element method. The simulation results obtained are presented and discussed.

Novel Conception of a Tunable RF MEMS Resonator

International Journal of Advanced Computer Science and Applications, 2017

This paper presents a new monolithic microwave integrated circuit (MMIC) based on coplanar wavegu... more This paper presents a new monolithic microwave integrated circuit (MMIC) based on coplanar waveguide (CPW) design for a tunable resonator based on RF MEMS. This RF structure, which can be used for system on chip (SOC), is constituted with MEMS Bridge placed between two meander inductors and the tenability is controlled by a variable applied DC voltage. Moreover, this device presents a compactness characteristic and the possibility to operate at high frequencies. The resonant frequency and the bandwidth can be changed easily by changing the bridge gap of the RF MEMS. The numerical simulations of this novel structure of a tunable RF MEMS resonator were performed with the electromagnetic solvers CST MWS (Computer simulation Technology Microwave Studio) and validated by the more accurate electromagnetic solver HFSS (High Frequency Structural Simulator). The simulation results, for three different spacing of the bridge gap, show that the tunable frequency band are between 10 and 40 GHz with the two electromagnetic solvers and exhibiting three resonant frequencies (21, 23.1 and 24.6 GHz).The simulation results of the return loss using CST achieves 29 dB with an insertion loss less than 1 dB; However, the HFSS simulation shows similar performance in the resonant frequencies and in the bandwidth giving better results in terms of the return loss (about 35dB instead of 29 dB) and showing a good adaptation.

Modelling the Interaction between the Antenna and the Human Head by the Technique of Artificial Neural Network

American Journal of Engineering and Applied Sciences, 2015

The purpose of this study is the study and modeling of phenomenon 'interaction between the antenn... more The purpose of this study is the study and modeling of phenomenon 'interaction between the antenna and the human body' by the Artificial Neural Network (ANN). This technique is based on mathematical formulations and a base of learning who took simulations by noted trade CST MS. An example of the interaction between a body, which the dielectric properties are given and a dipole antenna, has been studied. The results validate the new approach. The good agreement between the results of the given simulation published justifies the modeling process and validates the current approach of the analysis.

Characterization of UWB antipodal Tapered Slot Antenna using Wave Concept Iterative Procedure

2015 1st URSI Atlantic Radio Science Conference (URSI AT-RASC), 2015

Analysis and design of electromagnetic band gap structures with stratified and inhomogeneous media

Optics Communications, 2010

ABSTRACT In this study, a generalized and easy to use method based on Hill&#39;s equation and... more ABSTRACT In this study, a generalized and easy to use method based on Hill&#39;s equation and chain matrix concept is used to analyze the electromagnetic wave propagation in stratified dielectric and inhomogeneous media with arbitrary profiles.Numerical simulations are performed to compute the reflection and transmission of several Electromagnetic Bandgap (EBG) structures for various permittivity profiles and given polarization as well as incidence angles of driving fields.Multilayer structures are analyzed and optimized to enhance their selectivity performances. Obtained results agree excellently well with other published data.

Online tracking of coherent signals over multiple-input multiple-output code division multiple access communication channel using JADE–Capon method in conjunction with iterative space–time lifting preprocessing scheme

IET Wireless Sensor Systems, 2012

The main motivation for this work is how to handle the circumvent problem encountered in decorrel... more The main motivation for this work is how to handle the circumvent problem encountered in decorrelating perfect coherent multipath signals over MIMO-CDMA channel with small number of sensors and few data snapshots. The authors propose a new iterative space-time lifting preprocessing (ISTLP) decorrelating scheme that guarantees a perfect decorrelating of a great number of impinging signals even when they are fully correlated and overlaying in space and time domains. It is based on exploiting iteratively the spatial and temporal redundancies arising from multiple antennas and multiple slots. The temporal lifting scheme is introduced first, for efficient tracking and cancelling of ISI, MAI and noise effects within the bank of the N-tapped-delay-lines associated with the user of interest. Secondly, this iterative multi-resolution approach will be coupled to a preprocessing scheme to allow easy transformation of resulting temporal-lifted covariance matrix from time domain to an equivalent Vandermonde structure in frequency domain to be exploited in spatial lifting step. Two detection criteria are therefore established to attempt the convergence state in ISTLP algorithm. Finally, a JADE-Capon method based on ST-MVDR beamformer is applied to the spatial-temporal-lifted preprocessed covariance matrix to compute the joint azimuth-direction-of-arrival and delay of desired K i multipath signals. The efficacy and high resolution capability of the proposed estimation approach is supported by numerical simulation results.

Frequency Domain Extended-MUSIC Algorithm for TOA Estimation in Indoor UWB Radio Impulse Channels

International Journal of Computer Applications, 2014

Several indoor localization systems have grown considerably, in order to obtain a high performanc... more Several indoor localization systems have grown considerably, in order to obtain a high performance in dense multipath propagation channels. Many studies have been done in this area. Different methods have been proposed based on the use of Impulse Radio Ultra Wide band (IR-UWB) signals. These systems are usually based on time of arrival estimation using different algorithms. In this paper, a new time of arrival estimation algorithm is proposed for impulse radio UWB systems, which is based on the EXTENDED-MUSIC algorithm. Furthermore, Simulation results show these performances in multipath channels. The proposed method is compared with other high resolution algorithms such as Multiple SIGNAL Classification (MUSIC), estimation of signal parameters via rotational invariance technique (ESPRIT) and the MATRIX PENCIL method. Simulation will justify the high accuracy and resolution localization capabilities of the proposed algorithm.

Estimation Itérative des Directions d'Arrivée de Sources

Cet article propose une nouvelle méthode de sous-espaces pour l'estimation d'angles d'arrivée de ... more Cet article propose une nouvelle méthode de sous-espaces pour l'estimation d'angles d'arrivée de signaux provenant de sources, émettrices et reçus sur un réseau de capteurs, sous l'hypothèse que les signaux sont a bande étroite et non corrélés sur une antenne rectiligne uniforme. Elle repose sur la détermination itérative du sous espace bruit (ou source) à partir d'un opérateur linéaire extrait de la matrice des vecteurs propres associés au sous-espace bruit (ou source) obtenu à l'itération précédente. Cet algorithme est initialisé à partir de la décomposition en sous espace source-sous espace bruit obtenue à partir soit des éléments propres de la matrice interspectrale des signaux mesurés sur l'antenne (cf. méthode MUSIC) soit à partir d'un opérateur linéaire extrait de la matrice interspectrale (cf. méthode du Propagateur). Cet article annonce une amélioration des performances en termes de résolution et de précision d'estimation au fur et à mesure des itérations.

Characterization of Microstrip Ring with a Narrow Gap by an Iterative Method

International Journal of Microwave Science and Technology, 2008

This paper presents an implementation of an iterative method based on the wave's concept, for... more This paper presents an implementation of an iterative method based on the wave's concept, for analysing a ring resonator. This method includes a two-dimensional fourier modal transformation (2D-FMT) in a wave guide environment. The method has the advantage of simplicity in that it does not involve basis functions and inversion of matrices, as used in other calculation methods. Therefore, it is capable of analyzing larger bodies than other classical techniques. An implementation of the iterative calculation is shown for the extraction ofSparameters of microwave components. The good agreement between simulation results and experimental published data justifies the design procedure and validates the present analysis approach.