Mohamed Latrach - Academia.edu (original) (raw)

Papers by Mohamed Latrach

Journal of Microwaves, Optoelectronics and Electromagnetic Applications, Jun 1, 2016

In this paper a novel design of microstrip diplexer and triplexer using open loop resonators is p... more In this paper a novel design of microstrip diplexer and triplexer using open loop resonators is presented. The proposed diplexer if formed by two band-pass filters for the Industrial Scientific Medical (ISM) applications at 5.8 GHz and the WIMAX applications (IEEE 802.16 WiMAX at 3.17 GHz to 4.2 GHz bands). The microstrip triplexer is designed for the Digital Communication System (DCS) at 1.8 GHz, WIMAX at 3.2 GHz and for the C-band at 4.4 GHz. Each device is formed by a set of filters with a matching network by using open loop resonators and a good arrangement of the transmission feed lines. Several parametric studies were achieved to study the influence of some critical parameters on the performances of the proposed circuits. The LC equivalent circuit of the band pass filter is examined and the values of its components are calculated. ADS Agilent and CST-MWS solvers are used to predict the electrical performances of the proposed circuits. The simulated frequency responses of these structures show good results with insertion losses around 2 dB, return losses better than 20 dB for all channels, and an isolation between all bands better than 20 dB. Besides, several transmission zeros are observed near the pass bands which enhance the selectivity and the isolation of the proposed devices.

Proceedings of the Third International Conference on Computing and Wireless Communication Systems, ICCWCS 2019, April 24-25, 2019, Faculty of Sciences, Ibn Tofaïl University -Kénitra- Morocco, 2019

In the context of miniaturization of microwave systems that this paper is aimed at. We have desig... more In the context of miniaturization of microwave systems that this paper is aimed at. We have designed a novel miniaturized 2.45 GHz antenna dedicated to operate for wireless power transmission applications. At first, the antenna was radiating at 5.8 GHz with the optimal dimentions, then, and by conserving the same size, we have switched the operating frequency to 2.45 GHz by using a novel configuration of Defected Ground Structure (DGS). The final structure have been designed and optimized by using Computer Simulation Technology (CST) Microwave Studio .The obtained results confirm the proper functioning of the antenna.

This paper presents the design of new compact printed broadband antennas for Ultra Wide Band appl... more This paper presents the design of new compact printed broadband antennas for Ultra Wide Band applications. The antenna structures are based on the CPW-fed combined with a slot and a stub line to increase the bandwidth. The proposed antennas have been successfully designed, optimized and simulated by using Momentum software integrated into ADS “Advanced Design System” and CST Microwave Studio. The measured input impedance bandwidth of the final broadband antennas ranging from 2.17.3 GHz and 2.1-11 GHz. The design considerations for achieving broadband antennas and both simulated, experimental results are presented and discussed.

International Journal of Technology, 2018

This paper presents a new dual-band microstrip antenna with embedded slots on a rectangular radia... more This paper presents a new dual-band microstrip antenna with embedded slots on a rectangular radiator. It is capable of operating in the two radio frequency identification (RFID) frequency bands simultaneously (UHF and microwave) and has a miniaturized size designed to be easily integrated into portable RFID readers. The simulation results, carried out using the two commercial software packages CST Microwave Studio electromagnetic and ADS, show stable radiation pattern performances and good matching input impedance at the desired operating frequencies. The proposed antenna has overall dimensions of 47×46 mm 2 and is mounted on an FR4 substrate with dielectric permittivity constant 4.4, thickness 1.6 mm and loss tangent 0.025. The creation of a prototype of the proposed optimal antenna allowed validation of the dual operating bands with-10 dB return-loss bandwidths of approx. 28 MHz centred at 0.868 GHz and of approx. 90 MHz centred at 2.45 GHz, which shows that the proposed antenna is a good candidate for implementation in handheld RFID readers.

This paper presents the design of a new compact antenna structure for multiple incorporating oper... more This paper presents the design of a new compact antenna structure for multiple incorporating operation service. The proposed antenna is suitable to operate at three different frequency bands, (1.77GHz-2.67GHz), (3.1GHz4.58GHz), and (5.5GHz-6.5GHz) with a return loss less than -10dB. The antenna structure includes a CPW fed line, the technique used to enlarge the frequency bands is the slots technique and in the same time we have developed a new antenna structure which operates in various wireless communication applications. The antenna parameters have been investigated and optimized by using CST Microwave Studio. To validate the CST Microwave Studio results before the antenna achievement, we have conducted another study by using ADS. The final circuit was achieved, measured and validated. Experimental results show that the proposed antenna with compact size of 42*32.7 mm has good radiation characteristics and operating in specific microwave applications ISM band, WLAN, WIFI, WIMAX a...

Proceedings of the Third International Conference on Computing and Wireless Communication Systems, ICCWCS 2019, April 24-25, 2019, Faculty of Sciences, Ibn Tofaïl University -Kénitra- Morocco, 2019

In this paper, we present a new UWB CPW low pass filter structure by using periodic elements. The... more In this paper, we present a new UWB CPW low pass filter structure by using periodic elements. The originality of this work is to develop a neFigure 4 showsw UWB LPF structure which is compact, miniature, and easy for fabrication. The validated LPF is a compact planar filter easy to associate with others microwave planar circuits, having a large band pass and a large rejection band. The final circuit is simulated and optimized by using the electromagnetic solver ADS (Advanced Design System). After many series of optimizations, we have validated the final circuit into simulation by using different optimization methods taking into account a high density of meshing in order to cover the whole circuit. The simulated LPF circuit shows good results in term of matching input impedance and insertion loss with a cutoff frequency of 6.5GHz. The entire area of the proposed LPF is 16x40 mm 2 .

TELKOMNIKA (Telecommunication Computing Electronics and Control), 2021

This paper presents a new circular polarized micro-strip antenna with a pentagonal shape radiator... more This paper presents a new circular polarized micro-strip antenna with a pentagonal shape radiator. The proposed antenna is designed to operate in the industrial scientific medical (ISM) band at the frequency of 2.45GHz for Wireless applications. The antenna consists of a radiating pentagon patch with appropriate dimensions on the upper side of a dielectric substrate and a defective ground structure (DGS) on the other side. The pentagon patch is fed through a 50Ω microstrip line. The structure is implemented on an FR-4 substrate with a relative permittivity of 4.4, loss tangent equal to 0.025 and thickness 1.58 mm. The antenna is designed and simulated by using advanced design system (ADS) electromagnetic solver and the achieved results are validated by using another electromagnetic solver. The simulation results indicate that the designed circularly polarized (CP) pentagonal microstrip patch antenna gives good results in terms of the reflection coefficient, voltage standing wave ratio (VSWR) and, axial ratio of 1.025 at 2.45 GHz.

TELKOMNIKA (Telecommunication Computing Electronics and Control), 2020

The differential phase shifter is an interesting four-port passive microwave network composed of ... more The differential phase shifter is an interesting four-port passive microwave network composed of two separate lines, the main line and the reference line, and providing stable phase difference between the two output signals over the specified bandwidth of interest. The most common differential phase shifter is the coupled-line Schiffman phase shifter. In this paper, a novel 90 degrees differential microstrip phase shifter configuration employing a half wavelength transmission line loaded with three open stubs is presented, the proposed design could achieve excellent performance with low phase variation over a wide bandwidth compared to the standard Schiffman phase shifter. The simulated results accomplished with the use of CST Microwave Studio and advanced design system (ADS), were found to be in good agreement and have shown that the proposed loaded-stub phase shifter achieved less than 1.1 dB insertion loss, greater than 13 dB return loss and constant 90±5 degrees phase shift over an 89 percent bandwidth

TELKOMNIKA (Telecommunication Computing Electronics and Control), 2019

The performance and advantages of microstrip patch antennas made them a field of interest for wir... more The performance and advantages of microstrip patch antennas made them a field of interest for wireless power transmission applications, especially for rectenna systems where the choice of the antenna is a crucial step. In this paper, a 5.8 GHz circularly polarized patch antenna has been designed and fabricated, then mounted by using 4 elements to achieve an antenna array to enhance the captured power to be converted by the rectifier circuit. The antenna array is well matched at 5.8 GHz in terms of reflection coefficient and has a directivity of 11 dB and a gain of 6 dB. Results have been confirmed by fabrication.

TELKOMNIKA (Telecommunication Computing Electronics and Control), 2018

This paper presents a new dual-band metamaterial monopole antenna for radio frequency identificat... more This paper presents a new dual-band metamaterial monopole antenna for radio frequency identification applications (RFID) in UHF and microwave band. This antenna is designed on an FR4 epoxy substrate with dielectric constant 4.4, loss tangent 0.025 and thickness 1.6mm and fed by 50 Ohms microstrip line. The proposed antenna consists of a rectangular patch incorporated with U slot and a partial ground plane, a split ring resonator (SRR) is inserted on the opposite side of the patch for dual-band operation. The antenna operates at 900MHz and 2.45GHz with a return loss of-33.73 dBi and-38.43 dB respectively. The numerical results show that the input impedance bandwidth of the antenna at the lower frequency band is 87 MHz (0.861GHz-0.948GHz) and in the upper-frequency band is 516MHz (2.255GHz-2.771GHz). The design parameters and performance are analyzed by using CST microwave studio. A prototype of the proposed antenna was fabricated to validate numerical results.

TELKOMNIKA (Telecommunication Computing Electronics and Control), 2017

The aim of this paper is to use defected ground structures (DGS) in order to miniaturize a micros... more The aim of this paper is to use defected ground structures (DGS) in order to miniaturize a microstrip patch antenna. The DGS structure is integrated in the ground plane to improve the performance of the planar antenna, and shifted the resonance frequency from 5.8 GHz to 2.5 GHz, with a miniaturization up to 83%. The antenna is designed, optimized, and miniaturized by using the CST MWstudio, mounted on an FR-4 substrate having a dielectric constant 4.4, a loss tangent tan (ɸ)=0.025, thickness of 1.6 mm with the whole area of 34X34 mm2.The proposed antenna is suitable for ISM (Industrial, Scientific and Medical) applications at 2.5 GHz with S11 ≤(-10) dB. The antenna is fed by 50ohm input impedance and it has good performances in terms of matching input impedance and radiation pattern. The proposed antenna was fabricated and tested.Simulation and measurement results are in good agreement.

TELKOMNIKA (Telecommunication Computing Electronics and Control), 2018

This paper proposes a novel compact band-stop filter based on Rectangular SRR unit cell. The BSF ... more This paper proposes a novel compact band-stop filter based on Rectangular SRR unit cell. The BSF structure consists of modified microstrip line connected to 50 Ω feed line on both sides and Rectangular-SRR which has been added and located in the center of the proposed design. The R-SRR dimensions are chosen and optimized in order to achieve a resonant frequency in the undesired band. This filter is designed, simulated and optimized using two electromagnetic solvers. The circuit performances have been investigated and found to have an excellent BSF characterized by high power rejection level in the stop-band, low insertion loss in the both pass-bands and compact size. The experimental results illustrate that the proposed BSF achieves a wide fractional bandwidth of 72 % at 2.2GHz.

International Journal of Electrical and Computer Engineering (IJECE), 2017

This paper presents the design of new compact antennas for ultra wide band applications. Each ant... more This paper presents the design of new compact antennas for ultra wide band applications. Each antenna consists of a rectangular patch fed by 50Ω microstrip transmission line and the ground element is a defected ground structure (DGS). The aim of this study is to improve the bandwidth of these antennas by using DGS and the modification geometry of rectangular structure, which gives new compact antennas for UWB applications. The input impedance bandwidth of the antennas with S11<-10dB is more than 10GHz, from 3GHz to more than 14 GHz. The proposed antennas are investigated and optimized by using CST microwave studio, they are validated by using another electromagnetic solver Ansoft HFSS. The measured parameters present good agreement with simulation. The final antenna structures offer excellent performances for UWB system.

International Journal of Electrical and Computer Engineering (IJECE), 2017

In this paper a design of a new antenna with modified ground plane is validated for multiband app... more In this paper a design of a new antenna with modified ground plane is validated for multiband applications. The proposed modified ground structure is incorporated with a patch antenna to boost the performance. The antenna’s entire area is 59.5x47mm2 and is printed on an FR-4 substrate and fed by a 50 Ohm microstrip line. This structure is validated in the GPS (1.56-1.58 GHz) band at 1.57 GHz, in the ISM (2.43-2.49 GHz) band at 2.45GHz and in the WiMAX (3.50-3.56 GHz) band at 3.53 GHz. These three frequency bands have good matching input impedance for, S11≤-10 dB. The antenna presents a good performance in terms of radiation pattern, and it is designed, optimized, and miniaturized by using CST-MW whose results are compared with other solvers HFSS and ADS. The results obtained by the use of the three EM solvers are in good agreement. After realization, we have tested and validated this antenna. The measurement results of the antenna present a good agreement with the numerical results.

International Journal of Electrical and Computer Engineering (IJECE), 2017

This paper presents the development of a new miniaturized and compact GCPW-fed slotted rectangula... more This paper presents the development of a new miniaturized and compact GCPW-fed slotted rectangular antenna structure reader for wideband UHF RFID applications. The optimized proposed antenna is suitable to operate a large frequency-band range from 0.8GHz to 1.3GHz with a bandwidth of 500MHz with a return loss less than -10dB. The antenna is based on a 1.6mm thickness FR4 epoxy substrate with a reduce dimensions compared to the simple rectangular antenna and size of proposed antenna is 47*40mm2. The new design consists of a compact rectangular patch with symmetric U-shaped slots and I-shaped include a partial ground plan and fed by 50 Grounded coplanar line. The antenna parameters have been investigated and optimized by using CST Microwave Studio. To validate the CST Microwave Studio results before the antenna achievement, we have conducted another study by using ADS. The final circuit achieved, measured and validated. Experimental results show that the proposed anten...

International Journal of Electrical and Computer Engineering (IJECE), 2019

A novel and compact multi-band stop filter using two different structures of circular DGS and cir... more A novel and compact multi-band stop filter using two different structures of circular DGS and circular DGS loaded with O-DGS unit, has good selectivity and wide upper pass band performance with good rejection based on defected ground structure (DGS) integrating a circular ring resonator to suppress undesired spurious bands frequency or harmonics in radio frequency and microwave circuits is proposed. An equivalent circuit model has been derived for the both structures of circular DGS and circular DGS loaded. The presented filter has a compact size because the circular ring resonator is integrated in DGS, the both of them are etching in the ground plane. The proposed filter presents an optimization method for generating multi-band characteristics without using a periodic cells or other complicate topology. The simulated results by ADS Agilent are presented and compared with the results simulated by two others software: CST and HFSS. Good agreement between the three simulated result...

TELKOMNIKA (Telecommunication Computing Electronics and Control), 2018

The aim of this paper is to use a new design of a negative resistance microwave oscillator in ord... more The aim of this paper is to use a new design of a negative resistance microwave oscillator in order to fab ricate oscillator with very good performance in terms of output power, efficiency, stab ility and phase noise. In this study the new concept of oscillator using distrib uted resonator and micro-strip circuit elements improve performances of our structure. A micro-strip microwave oscillator with low phase noise b ased on an NPN silicon planar epitaxial transistor has b een designed, fab ricated, and characterized. In this design, each step has b een conducted b y using Advanced Design System (ADS) and following a theoretical study which enab le to optimize the different performances of the whole c ircuit. The oscillator produce a sinusoidal signal with spectrum power of 12.25 dBm at 2.45 GHz into 50 Ω load when polarized at Vcc=15V with DC to RF efficiency of 16. The ob tained phase noise of-120 dBc/Hz at 100 Hz offset is the result of the use of high Q factor resonator and the depth study of the parameters of the oscillator. Simulation and measurement results are in good agreement.

TELKOMNIKA (Telecommunication Computing Electronics and Control), 2018

RF/microwave power amplifier (PA) is one of the components that has a large effect on the overall... more RF/microwave power amplifier (PA) is one of the components that has a large effect on the overall performance of communication system especially in transmitter system and their design is decided by the parameters of transistor selected. This letter presents a new concept of a wide-band microwave amplifier using scattering parameters that is often used in the radio frequency communication systemas an application of the active integrated antenna[1-2]. This power amplifier operates from 1.75 GHz to 2.15GHz frequency and it is based on AT-41410 NPN transistor that has a high transition frequency of 10GHz. The proposed Single Stage PA is designed by microstrip technology and simulated with Advanced Design System (ADS) software. The simulation results indicate good performances; the small power gain (S21) is changed between 11.8 and 10dB. For the input reflection coefficient (S11) is varied between-11 and-22.5dB. Regarding the output reflection coefficient (S22) is varied between-13.1 and-18.7dB over the wide frequency band of 1.75-2.15GHz and stability without oscillating over a wide range of frequencies.

Indonesian Journal of Electrical Engineering and Informatics (IJEEI), 2019

In this paper we present the Design of Continuous Wave Terahertz photonic transmitter based on ph... more In this paper we present the Design of Continuous Wave Terahertz photonic transmitter based on photodetector, THz antenna, and low-pass filter (LPF) and Direct Current "DC" Probe Bias. Before validating the whole system, we processed firstly with the optimization of the antenna which is responsible of the transmitting the RF signal providing from the photodetector then we have conducted a study on the design of a low pass filter "LPF" whose role is to block the received RF signal to reach the DC probe. After the optimisation of the proposed LPF, we have integrated the different components mounted on multi-layers GaAs substrate and simulated the final photonic transmitter by using an EM solver "Momentum" integrated in ADS "Advanced Design System". The dimensions of the whole circuit are 704.99 154.99 μm .The simulation results permit to validate the final circuit at 1.6 THz, the proposed photonic transmitter is suitable for terahertz spectroscopy and imaging applications.

TELKOMNIKA (Telecommunication Computing Electronics and Control), 2018

This work deals with the design, simulation, fabrication and experimentation of a novel 2.45 GHz ... more This work deals with the design, simulation, fabrication and experimentation of a novel 2.45 GHz rectifier for wireless power transmission applications. We have designed a voltage multiplier topology rectifier including 5 Schottky diodes known by their low threshold. This rectifier could perform a wireless power supply for many cases where the use of batteries or wires is impossible due to many limitations. The circuit was analyzed and optimized with the Harmonic Balance method provided by the Advanced Design System (ADS). Good performances are observed through the simulated results and confirmed by the fabrication tests in terms of RF-DC conversion efficiency, DC output voltage level and matching input impedance.