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Inkjet Printed Metamaterial Loaded Antenna for WLAN/WiMAX Applications

Computers, Materials & Continua 2022年第5期71卷 2271-2284页

作者： Farhad Bin Ashraf Touhidul Alam md tarikul islam Mandeep Jit Singh Norbahiah Binti Misran Mohammad Tariqul islam Department of Electrical Engineering Polytechnique MontréalMontréalQC H3T 1J4Canada Space Science Centre(ANGKASA) Institute of Climate Change(IPI)Universiti Kebangsaan MalaysiaBangi43600SelangorMalaysia Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaMalaysia

In this paper,the design and performance analysis of an Inkjetprinted metamaterial loaded monopole antenna is presented for wireless local area network(WLAN)and worldwide interoperability for microwave access(WiMAX)*** proposed metamaterial structure consists of two layers,one is rectangular tuning fork-shaped antenna,and another layer is an inkjet-printed metamaterial *** metamaterial layer is designed using four split-ring resonators(SRR)with an H-shaped inner structure to achieve negative-index metamaterial *** metamaterial structure is fabricated on low-cost photo paper substrate material using a conductive inkbased inkjet printing technique,which achieved dual negative refractive index bands of 2.25–4.25 GHz and 4.3–4.6 *** antenna is designed using a rectangular tuning fork structure to operate at WLAN and WiMAX *** antenna is printed on 30×39×1.27 mm3 Rogers RO3010 substrate,which shows wide impedance bandwidth of 0.75 GHz(2.2 to 2.95 GHz)with 2 dB realized gain at 2.4 *** integrating metamaterial structure,the impedance bandwidth becomes 1.25 GHz(2.33 to 3.58 GHz)with 2.6 dB realized gain at 2.4 *** antenna bandwidth and gain have been increased using developed quad SRR based metasurface by 500 MHz and 0.6 dBi ***,the proposed quad SRR loaded antenna can be used for 2.4 GHz WLAN bands and 2.5 GHz WiMAX *** contribution of this work is to develop a cost-effective inject printed metamaterial to enhance the impedance bandwidth and realized the gain of a WLAN/WiMAX antenna.

关键词： Metamaterial epsilon negative antenna split ring resonator WiMAX WLAN

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Assorted soliton structures of solutions for fractional nonlinear Schrodinger types evolution equations

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Journal of Ocean Engineering and Science 2022年第6期7卷 528-535页

作者： md.tarikul islam md.Ali Akbar J.F.Gómez-Aguilar E.Bonyah G.Fernandez-Anaya Department of Mathematics Hajee Mohammad Danesh Science and Technology UniversityDinajpurBangladesh Department of Applied Mathematics University of RajshahiRajshahiBangladesh CONACyT-Tecnológico Nacional de México/CENIDET.Interior Internado Palmira S/N Col.PalmiraC.P.62490CuernavacaMorelosMexico Department of Mathematics Education Akenten Appiah Menka University of Skills Training and Entrepreneurial DevelopmentKumasiGhana Departamento de Física y Matemáticas.Universidad Iberoamericana C.P.01219CDMXMexico

Fractional order nonlinear evolution equations have emerged in recent times as being very important model for depicting the interior behavior of nonlinear phenomena that exist in the real *** particular,Schrodinger-type fractional nonlinear evolution equations constitute an aspect of the field of quantum *** this study,the(2+1)-dimensional time-fractional nonlinear Schrodinger equation and(1+1)-dimensional time-space fractional nonlinear Schrodinger equation are revealed as having different and novel wave *** is shown by constructing appropriate analytic wave solutions.A success-ful implementation of the advised rational(1/φ'(ξ))-expansion method generates new outcomes of the considered equations,by comparing them with those already noted in the *** the basis of the conformable fractional derivative,a composite wave variable conversion has been used to adapt the suggested equations into the differential equations with a single independent variable before applying the ***,the well-furnished outcomes are plotted in different 3D and 2D profiles for the purpose of illustrating various physical characteristics of wave *** employed technique is competent,productive and concise enough,making it feasible for future studies.

关键词： The rational(1/φ'(ξ))-expansion method Wave variable transformation Nonlinear fractional Schrodinger equation Analytic solution Soliton

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Effect of Alkali Concentration on Dyeing Cotton Knitted Fabrics with Reactive Dyes

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Journal of Chemistry and Chemical Engineering 2017年第4期11卷 162-167页

作者： Debasree Paul Subrata Chandra Das tarikul islam md. Abu Bakar Siddiquee md. Abdullah AlMamun Department of Textile Engineering Khwaja Yunus Ali University Sirajgonj Bangladesh Pabna Textile Engineering College Pabna-6600 Department of Textiles Ministry of Textiles and Jute Bangladesh Department of Textile Engineering Port City International University Chittagong Bangladesh Department of Textile Engineering Mawlana Bhashani Science and Technology University Tangail1902 Bangladesh

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Effect of Spinning Parameters on Thick, Thin Places and Neps of Rotor Spun Yarn

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Journal of Textile Science and Technology 2016年第3期2卷 47-55页

作者： md. Reazuddin Repon Rajib Al Mamun Selim Reza Mithun Kumer Das tarikul islam Department of Textile Engineering Khwaja Yunus Ali University Sirajgonj Bangladesh PM Group Narayanganj Bangladesh Department of Textile Engineering Daffodil International University Dhaka Bangladesh Department of Textile Engineering Port City International University Chittagong Bangladesh

Defect free yarn is a great demand for spinner, knitter, and weaver and also other textile personnel because numerous end products from knit apparels to woven fabrics, from towels to sheets and from carpets to industrial fabrics characteristics significantly depend on the physical properties of yarn. The qualities of rotor yarn are really directed by spinning parameters. The aim of this study is to observe the effect of spinning parameters such as rotor diameter and speed on thick, thin places and neps of yarn in rotor spinning process. 0.11 sliver hank of 100% cotton was used to produce 12 Ne yarn. 65% virgin cotton and 35% wastage cotton were mixed together. The positive impact of spinning parameters on yarn properties were accessed by thick places, thin places and neps. Results indicate that the yarn qualities were improved with increasing of rotor speed and rotor diameter. The rotor diameter was settled to 43 mm while rotor speed fluctuated from 35,000 to 45,000 rpm and rotor speed was fixed to 35,000 rpm while rotor diameter across contrasts from 43 mm to 66 mm.

关键词： Rotor Spinning Rotor Diameter Rotor Speed Thick Places Thin Places Neps

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