Microwave group

Rabat, Morocco

Microwave group

Rabat, Morocco
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Ihamji M.,Hassan 1 University | Abdelmounim E.,Hassan 1 University | Zbitou J.,Hassan 1 University Settat | Bennis H.,Hassan 1 University Settat | Latrach M.,Microwave Group
SITA 2016 - 11th International Conference on Intelligent Systems: Theories and Applications | Year: 2016

This work presents the miniaturization of a single rectangular microstrip antenna at 2.45 GHz in the ISM 'Industrial Scientific and Medical' band by using the slots technique. This microstrip antenna has a CPW fed and designed for RFID reader system on FR4 substrate with dielectric constant of 4.4, and simulated performing CST Microwave Studio. The total area of the final circuit is 19 × 31 mm2. The validated antenna has a good matching input impedance range from 2.338 GHz to 2.573 GHz with a stable radiation pattern, a loss return of -40 dB, and a gain of 1.78 dBi. © 2016 IEEE.


Ihamji M.,Hassan 1St University | Abdelmounim E.,Hassan 1St University | Zbitou J.,Hassan 1St University | Bennis H.,Hassan 1St University | Latrach M.,Microwave Group
Proceedings - 2016 International Conference on Wireless Networks and Mobile Communications, WINCOM 2016: Green Communications and Networking | Year: 2016

This work presents the miniaturization of a single rectangular microstrip antenna at 2.45 GHz in the ISM 'Industrial Scientific and Medical' band by using the fractal technique. This microstrip antenna has A CPW fed and designed for RFID reader system on FR4 substrate with dielectric constant of 4.4, and simulated performing CST Microwave Studio. The total area of the final circuit is 21.22 × 32.05 mm2.The validated antenna has a good matching input impedance range from 2.304 GHz to 2.625 GHz with a stable radiation pattern, a loss return equal to-35.9 dB, and a gain of 2.2 dBi. © 2016 IEEE.


Hamraoui A.E.,Hassan 1st University | Abdelmounim E.H.,Hassan 1st University | Zbitou J.,Hassan 1st University | Bennis H.,Hassan 1st University | Latrach M.,Microwave Group
SITA 2016 - 11th International Conference on Intelligent Systems: Theories and Applications | Year: 2016

This paper presents a new dual-band microstrip slot antenna using two inverted L-shaped slots embedded on the radiating patch, suitable for Radio Frequency Identification (RFID) applications especially designed for RFID readers and it operates at 910 MHz and 2.45 GHz. This antenna is designed with a reasonable gain, low profile and low cost achievement. The simulation results carried out by ADS and CST Microwave Studio electromagnetic solvers, demonstrate that we have good performances in term of return loss, gain, radiation pattern and efficiency for the desired frequency bands. This antenna has a total area of 48×47 mm2 and mounted on an FR4 substrate with dielectric permittivity constant 4.4, thickness of 1.6 mm and loss tangent of 0.025. All simulation results of the resonant frequency, return loss, radiation patterns and fields distributions are presented. © 2016 IEEE.


Malki A.,Hassan 1st University | Zbitou J.,Hassan 1st University | El Abdellaoui L.,Hassan 1st University | Errkik A.,Hassan 1st University | And 2 more authors.
International Conference on Multimedia Computing and Systems -Proceedings | Year: 2017

This paper presents a new design of negative resistance oscillator with low phase noise by using microwave microstrip technology. This microstrip oscillator is designed at 2.4 GHz frequency for applications in mobile communication, wireless network, wireless fidelity, and Bluetooth. The final circuit is designed by using microstrip distributed resonator. The distributed resonator can be modeled by using the parallel RLC at the resonant frequency. The high Q factor of the resonator provides high carrier output power and low phase noise. The output power is obtained around 7.902dBm at 2.4 GHz with 2V DC supply and 12 mA current consumption. In this proposed oscillator, each step has been analyzed by using Advanced Design System ADS and following a theoretical study which permits to optimize the different performances of the whole circuit. © 2016 IEEE.


El Hamraoui A.,Hassan 1st University | Abdelmounim E.H.,Hassan 1st University | Zbitou J.,Hassan 1st University | Bennis H.,Hassan 1st University | Latrach M.,Microwave Group
International Conference on Multimedia Computing and Systems -Proceedings | Year: 2017

This paper presents a study of a new dual-band monopole antenna fed by a Coplanar Waveguide (CPW) line suitable for Radio Frequency Identification (RFID) applications especially designed for RFID readers and it operates at 2.45 GHz and 5.8 GHz. This antenna is designed with a reasonable gain, low profile and low cost achievement. The proposed antenna benefits from the advantages of the CPW line to simplify the structure of the antenna into a single metallic level, by consequent making it easier for integration with microwave integrated circuits. The simulation results carried out by ADS from Agilent technologies and CST Microwave Studio electromagnetic solvers, demonstrate that we have good performances in term of return loss, gain, radiation pattern and efficiency for the desired frequency bands. This antenna has a total area of 34×30.6mm2 and mounted on an FR4 substrate with dielectric permittivity constant 4.4, thickness of 1.6mm and loss tangent of 0.025. The gain obtained into simulation of this antenna is 1,1dB at 2.45GHz and 2dB at 5.8 GHz. © 2016 IEEE.


El Hamraoui A.,Hassan 1st University | Abdelmounim E.H.,Hassan 1st University | Zbitou J.,Hassan 1st University | Bennis H.,Moulay Ismaï University | And 2 more authors.
2017 International Conference on Wireless Technologies, Embedded and Intelligent Systems, WITS 2017 | Year: 2017

This paper presents a new design of a low cost passive UHF RFID tag antenna using paper substrate. The design is based on a short dipole loaded at both ends with a pair of triangles and four arms in order to reduce the size of the design. By choosing a proper dimension of the short dipole and the T-matching network, a good and broadband impedance matching can be achieved. The simulation results carried out by ADS from Agilent technologies and CST Microwave Studio electromagnetic solvers, demonstrate that we have good performances in term of return loss, gain, radiation pattern and read range for the desired frequency bands. This antenna has a total area of 80×34 mm2 and mounted on a paper substrate. With a constant dielectric permittivity, equal to 3.3, a thickness of 0.5 mm and a loss tangent of 0.04. The simulated bandwidth at the UHF RFID band is about 56 MHz, which covers the North and South American UHF RFID band (894-950 MHz). The gain obtained into simulation of this antenna is 1.88 dB at 915 MHz and the simulated read range is 5.78 m. © 2017 IEEE.


Er-Rebyiy R.,University of Hassan 1st Morocco | Zbitou J.,University of Hassan 1st Morocco | Tajmouati A.,University of Hassan 1st Morocco | Latrach M.,Microwave Group | And 2 more authors.
2017 International Conference on Wireless Technologies, Embedded and Intelligent Systems, WITS 2017 | Year: 2017

The concept of Defected Ground Structures (DGS) has been developed to improve the characteristics of many microwave devices. For this purpose the DGS is also used in the microstrip antenna for some advantages such as antenna size reduction, mutual coupling reduction in antenna arrays etc.. In this paper the defected ground structure (DGS) has been employed to miniaturize a microstrip patch antenna and to shift the resonance frequency from an initial value of 10 GHz to a final value at 3.5 GHz, without any change in the dimensions of the original microstrip patch antenna. This antenna is designed on a FR-4 substrate with dielectric constant 4.4 and thickness 1.6 mm and its size is 27 × 30 mm2. The antenna is designed, optimized, and miniaturized by using CST MW. © 2017 IEEE.


Nasiri B.,Hassan 1st University | Errkik A.,Hassan 1st University | Zbitou J.,Hassan 1st University | Tajmouati A.,Hassan 1st University | And 2 more authors.
2017 International Conference on Wireless Technologies, Embedded and Intelligent Systems, WITS 2017 | Year: 2017

In this work, a novel compact microstrip low-pass filter is designed based on square split ring resonator. The SRR is used to reduce the size of the filter and to improve the good electrical performances. The dumbbell-shaped defected ground structure is introduced into the ground plane in order to achieve a desired cutoff frequency of 1.2 GHz with a ripple level less than 0.2 dB in the pass-band and an attenuation better than 20 dB in the rejected band. The proposed filter is designed on an FR-4 substrate having a thickness of 1.6mm, a dielectric constant of 4.4 and loss tangent of 0.025. The whole area of the proposed circuit is 24×26mm2. The computed results obtained by CST microwave and Ansoft HFSS are in good agreement. The size of LPF is miniaturized by 60% compared to the conventional filter. © 2017 IEEE.


El Marini S.,Hassan 1st University of Settat | Zbitou J.,Hassan 1st University of Settat | Mandry R.,Hassan 1st University of Settat | Errkik A.,Hassan 1st University of Settat | And 2 more authors.
2017 International Conference on Wireless Technologies, Embedded and Intelligent Systems, WITS 2017 | Year: 2017

A 45 degree differential microstrip phase shifter operating in the frequency band ranging from 1.4 GHz to 2.7 GHz is presented in this paper. It is designed by adopting the model of double parallel Schiffman phase shifter and simulated on an FR4 substrate by using two electromagnetic simulation software, ADS from Agilent technologies and CST Microwave Studio. The proposed phase shift circuit offers good results in terms of return loss, insertion loss and phase shift. Good agreement between simulated results using ADS and CST Microwave Studio is obtained. © 2017 IEEE.


Er-Rebyiy R.,University of Hassan 1st Morocco | Zbitou J.,University of Hassan 1st Morocco | Tajmouati A.,University of Hassan 1st Morocco | Latrach M.,University of Hassan 1st Morocco | And 2 more authors.
2017 International Conference on Wireless Technologies, Embedded and Intelligent Systems, WITS 2017 | Year: 2017

In this paper, we propose a novel reconfigurable patch antenna for wireless communication systems. The proposed reconfigurable antenna is based on PIN diodes associated to three U shaped resonators. The operating frequency of the proposed antenna can be tuned by changing the state of the PIN diode. In this work, we modelized the PIN diode using two different methods. This circuit is mounted on an FR-4 substrate with a thickness of 1.6mm, dielectric constant of 4.4 and tangent loss of 0.025. The simulation results are performed with CST-MW studio and verified by ADS. © 2017 IEEE.

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