Publications Internationales
Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/13
Browse
28 results
Search Results
Item Gain Enhancement of Monopole Antenna using AMC Surface(Advanced Electromagnetics, 2018) Mouhouche, Faiza; Azrar, Arab; Dehmas, Mokrane; Djafer, KahinaA CPW rectangular-ring antenna over an Artificial Magnetic Conductor (AMC) is presented in this work. The AMC is a designed as a dual-band structure having an array of unit cells and operates at 2.45GHz and 5.20 GHz. A CPW antenna uses this dual-band AMC structures as a back-plane. Performance comparison is carried out with and without incorporation of AMC. The simulated and measured results show that the combination of the AMC reflector and the antenna provide directional properties at both frequency bands. It has been found that the antenna gain increases by about 5 dBItem Pilot contamination mitigation based on antenna subset transmission for mmWave massive MIMO(wiley, 2018) Smaili, Nessrine; Djeddou, Mustapha; Azrar, ArabThis paper tackles the problem of pilot contamination (PC) in mmWave Mas- sive MIMO cellular systems. We propose an analog precoder based on antenna subset transmission technique to mitigate the PC. This technique ensures the interfering signal to become noise-like signal thus helping a more efficient estimation of channel coefficients. Also, this strategy is low cost and introduces no complexity load. The result shows the effectiveness of the proposed precoder to mitigate PC issueItem Effect of oblique projection beamforming on the achievable rate in massive MIMO system(Springer, 2018) Smaili, Nessrine; Djeddou, Mustapha; Ghanem, K.; Azrar, ArabItem Spectral-domain integral-equation analysis of microstrip antenna working around 24 GHz(Wiley, 2000) Azrar, Arab; Aksas, Rabia; Vander Vorst, AndréItem Full-wave analysis of the broadband circular polarization microstrip patch antenna(Wiley, 2000) Azrar, Arab; Aksas, Rabia; Vander Vorst, AndreItem Full‐wave analysis of the broadband circular polarization microstrip patch antenna(Wiley, 2000) Azrar, Arab; Aksas, Rabia; Vander Vorst, AndreItem Novel analysis and design approaches of the planar antenna arrays(Springer, 2007) Azrar, Arab; Chemsa, Ali; Aksas, RabiaItem Compact Down-Conversion mixer design employing a wide and deep Stop-Band DGS-LPF(2016) Challal, Mouloud; Dehmas, Mokrane; Azrar, Arab; Aksas, Rabia; Trabelsi, MohamedThis paper investigates a compact 24-GHz hybrid down-conversion mixer. The proposed mixer is based on a wide and deep stop-band low pass filter, four Schottky diodes, two hybrid couplers and an open stub. The unwanted harmonics are rejected by means of a filter based on three uniforms dumbbell-shaped defected ground structure and a compensated microstrip line. A good conversion loss of 2.19dB, 1-dB compression point of 3-dBm and an LO-to-RF isolation better than 35dB are obtained. The validity of the mixer configuration and the design procedure are confirmed by a comparison between simulation results and measurements data reported in literatureItem Circuit modeling and EM simulation verification of DGS based Low-Pass filter employing transmission line model along with Microstrip-Slotline transitions(EDP Sciences, 2016) Challal, Mouloud; Dehmas, Mokrane; Azrar, Arab; Aksas, Rabia; Trabelsi, MohamedIn this paper, an equivalent circuit model (ECM) for a defected ground structure (DGS) pattern is proposed and evaluated for designing a compact low-pass filter (LPF). The proposed ECM is based on microstrip lines and microstrip-slotline transitions. Every slotlines of the DGS unit are modeled by ideals transmission lines of characteristic impedance and electrical length. Comparison between full-wave EM and circuit simulations illustrates the validity of the proposed ECMItem Novel mathematical formulation of the antenna array factor for side lobe level reduction(2016) Gassab, Oussama; Azrar, Arab
- «
- 1 (current)
- 2
- 3
- »