Browsing by Author "Ibrahim M.S."

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22 circularly polarized MIMO antenna at Ka-band for fifth generation applications
(Praise Worthy Prize S.r.l, 2019) Ibrahim M.S.; College of Engineering; Prince Sultan University; Riyadh; Saudi Arabia; College of Engineering; Modern Sciences and Arts University; Egypt
In this paper, two ports Circularly Polarized (CP) multiple-input multiple-output (MIMO) Square Microstrip Patch Antenna (SMPA) at Ka-band is developed. The proposed antenna is designed in order to resonate at 28 GHz (Ka-band) which is suitable for fifth generation (5G) applications. CP is realized by introducing two corners truncation with V-shaped slot of the square patch. The presence of the V-slot has improved the impedance bandwidth of the proposed antenna. The analysis and the optimization processes throughout this paper are carried out using Finite Element Method (FEM) and Finite Integration Technique (FIT). Single element and two elements corporate fed array are fabricated and their scattering matrices have been measured. A good agreement between simulated and measured data is obtained. An equivalent circuit model for the proposed two port MIMO array with circuit element values is introduced. The total efficiency of the proposed MIMO antenna is higher than 85% along the entire bandwidth. The proposed design covers 26.55 29.2 GHz (9.4%) frequency band with more than 34 dB isolation between the two ports along that frequency band. Hence, the proposed antenna performance makes it a good candidate for the 5G applications at millimeter wave frequency. 2019 Praise Worthy Prize S.r.l.-All rights reserved.
Design of low-cost, circularly polarized, and wideband U-slot microstrip patch antenna with parasitic elements for WiGig and WPAN applications
(Applied Computational Electromagnetics Society (ACES), 2019) Ibrahim M.S.; Department of Communications and Networks Engineering; College of Engineering; Prince Sultan University; Riyadh; 11586; Saudi Arabia; Department of Electrical Communication and Electronic Systems Engineering; College of Engineering; Modern Sciences and Arts University; 6th October; 12566; Egypt
In this article, a well matched U-Slot Microstrip Patch Antenna (MPA) with two paratactic elements is designed and simulated. The antenna is designed to resonate at 60 GHz (V-band) and exhibits a wideband extend from 53.3 GHz to 60.8 GHz with more than 87% total efficiency. The presence of U-slot makes a current perturbation in the antenna which contributes to generate a Circular Polarization (CP). The 3-dB Axial Ratio (AR) is extended from 56 � 57.2 GHz (~ 1.2 GHz bandwidth). The analysis and optimization processes throughout this paper are carried out using Finite Element Method (FEM) and verified with Finite Integration Technique (FIT). Good agreement between the results by the two simulators is obtained. Hence, the performance of the proposed antenna makes it a good candidate for fifth generation applications at V-band like Wireless Gigabit Alliance (WiGig) and Wireless Personal Area Network (WPAN). � ACES
A dielectric resonator antenna over corrugated ground plane with metallic and nonmetallic metamaterial superstrates
(Institute of Electrical and Electronics Engineers Inc., 2017) Ibrahim M.S.; College of Engineering; Prince Sultan University; Riyadh; Saudi Arabia; College of Engineering; Modern Sciences and Arts University; Egypt
In this paper, some applications of metamaterial superstrates for directivity enhancement of cylindrical dielectric resonator antenna (DRA) mounted on corrugated ground plane are investigated. Three different types of superstrates, viz., split ring resonator (SRR), S-shape, and cubic high dielectric resonator (CHDR) are discussed. The metamaterial structure is used as a lens to improve the directivity of DRA and the corrugated ground to suppress back lobes. � 2017 IEEE.
Omni-directional dual-band patch antenna for the LMDS and WiGig wireless applications
(ASTES Publishers, 2018) Ibrahim M.S.; Department of Communications and Networks Engineering; College of Engineering; Prince Sultan University; Riyadh; 11586; Saudi Arabia; College of Engineering; Modern Sciences and Arts University; 6th October City; Egypt
In this paper an omnidirectional dual band monopole antenna at 28 GHz and 60 GHz which is fit for indoor and outdoor wireless applications is developed. The proposed antenna consists of two rectangular patches with a T folded patch. The design, analysis, and optimization processes through this article are executed by the numerical method, Finite Element Method (FEM) and verified with another numerical method, Finite integration Technique (FIT). Good agreement between the results by these two simulators is obtained. The proposed antenna has achieved dual bands with omnidirectional patterns. The first band at 28 GHz is extended from 27.5 GHz to 28.958 GHz with 5.1 % bandwidth and total efficiency of more than 93% along the entire band which serves the LMDS band. The second band at 60 GHz is extended from 45.2 GHz to 84.4 GHz which serves the WiGig band with bandwidth of 60.6% and total efficiency of 85.5% along the entire band. The proposed antenna performance makes it a good candidate for the fifth generation (5G) applications. � 2018 Advances in Science, Technology and Engineering Systems. All rights reserved.
Studying the interaction of hydrophobically modified ethoxylated urethane (HEUR) polymers with sodium dodecylsulfate (SDS) in concentrated polymer solutions
(Academic Press Inc., 2018) Ibrahim M.S.; Valencony J.; King S.; Murray M.; Szczygiel A.; Alexander B.D.; Griffiths P.C.; Faculty of Engineering and Science; University of Greenwich; Medway Campus; Chatham MaritimeKent ME4 4TB; United Kingdom; Pharmaceutics Department; Faculty of Pharmacy; Modern Science and Arts University; 26 July Mehwar Road Intersection with Wahat Road; Cairo; Egypt; Science and Technology Facilities Council; ISIS Facility; Rutherford Appleton Laboratory; Didcot; Oxfordshire OX11 OQX; United Kingdom; AkzoNobel; Wexham Road; Slough; Berkshire SL2 5DS; United Kingdom
Hypothesis: Hydrophobically modified ethoxylated urethane polymers (HEURs) are widely used to control the rheological profile of formulated particulate dispersions through associative network formation, the properties of which are perturbed by the presence of surfactants. At high polymer concentrations and in the presence of surfactants, it is hypothesised that the dominant factors in determining the rheological profile are the number and composition of the mixed hydrophobic aggregates, these being defined by the number and distribution of the hydrophobic linkers along the polymer backbone, rather than the end-group hydrophobe characteristics per se that dominate the low polymer concentration behaviour. Experiments: Three different HEUR polymers with formulae (C6-L-(EO100-L)9-C6, C10-L-(EO200-L)4-C10 and C18-L-(EO200-L)7-C18 (where L = urethane linker, Cn = hydrophobic end-group chain length, and EO = ethylene oxide block) have been studied in the absence and presence of SDS employing techniques that quantify (a) the bulk characteristics of the polymer surfactant blend, (b) the structure and composition of the hydrophobic domains, (c) the dynamics of the polymer and surfactant, and (d) the polymer conformation. Collectively, these experiments demonstrate how molecular-level interactions between the HEURs and sodium dodecylsulfate (SDS) define the macroscopic behaviour of the polymer/surfactant mixture. Findings: Binding of the SDS to the polymer via two mechanisms � monomeric anti-cooperative and micellar cooperative � leads to surfactant-concentration-specific macroscopic changes in the viscosity. Binding of the surfactant to the polymer drives a conformational rearrangement, and an associated redistribution of the polymer end-groups and linker associations throughout the hydrophobic domains. The composition and size of these domains are sensitive to the polymer architecture. Therefore, there is a complex balance between polymer molecular weight, ethylene oxide block size, and number of urethane linkers, coupled with the size of the hydrophobic end-groups. In particular, the urethane linkers are shown to play a hitherto largely neglected but important role in driving the polymer association. � 2018 Elsevier Inc.
Surfactant modulated interaction of hydrophobically modified ethoxylated urethane (HEUR) polymers with impenetrable surfaces
(Academic Press Inc., 2019) Ibrahim M.S.; Rogers S.; Mahmoudy N.; Murray M.; Szczygiel A.; Green B.; Alexander B.D.; Griffiths P.C.; Faculty of Engineering and Science; University of Greenwich; Medway Campus; Chatham Maritime; Kent ME4 4TB; United Kingdom; Pharmaceutics Department; Faculty of Pharmacy; Modern Science and Arts University; 26 July Mehwar Road Intersection with Wahat Road; Cairo; Egypt; Science and Technology Facilities Council; ISIS Facility; Rutherford Appleton Laboratory; Didcot; Oxfordshire OX11 OQX; United Kingdom; AkzoNobel; Wexham Road; Slough; Berkshire SL2 5DS; United Kingdom
Hypothesis: The presence of surfactant modulates the surface-chemistry-specific interaction of hard colloidal particles (latex) with HEUR polymers, principally through introducing a preferential solution interaction rather than a competitive surface interaction; addition of surfactant leads to a preponderance of polymer/surfactant solution complexes rather than surface-bound complexes. Experiments: A range of model formulations comprising a hexyl end-capped urethane polymer (C6-L-(EO100-L)9-C6), sodium dodecylsulfate (SDS) and a series of polystyrene-butylacrylate latices (PS-BA-L) have been characterised in terms of rheology, particle surface area (solvent relaxation NMR), polymer conformation (small-angle neutron scattering) and solution composition to build up a detailed picture of the distribution of the HEUR in the presence of both surfactant and latex. Findings: There is very weak adsorption of C6-L-(EO100-L)9-C6 to only the most hydrophobic latex surface studied, an adsorption that is further weakened by the addition of low levels of surfactant. Macroscopic changes in the hydrophobic latex system may be interpreted in terms of bridging flocculation at low polymer concentrations. No adsorption of C6-L-(EO100-L)9-C6 is observed in the case of hydrophilic surfaces. In most cases, the observed behaviour of the ternary system (polymer/surfactant/particle) is highly reminiscent of the binary (polymer/surfactant) system at the appropriate composition, suggesting that the polymer/surfactant solution interaction is the dominant one. 2018