Browsing by Author "Islam, M. T."

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A compact disc-shaped super wideband patch antenna with a structure of parasitic element
(IOS Press, 2016) Islam, M. M.; Islam, M. T.; Faruque, M. R. I.; Misran, N.; Samsuzzaman, M.; Hossain, M. I.; Alam, T.
In this paper, a disc-shaped monopole antenna has been investigated for super-wideband applications with a structure of parasitic element. The proposed SWB antenna consists of disc-shaped patch and a partial ground plane with a structure of parasitic element. The parasitic element consists of 4 rectangular embedded slots on the ground plane. This parasitic element on the ground plane leads the UWB frequency band into the SWB frequency band. This proposed SWB antenna is fed by a microstrip line and is printed on low dielectric FR4 material of 1.6 mm thickness. All the simulations are performed using commercially available, finite element method (FEM) based Ansoft high-frequency structure simulator (HFSS) software and CST Microwave Studio. Measured results exhibit that the proposed disc-shaped antenna shows a wide bandwidth which covers from 2.90 GHz to more than 20 GHz, with a compact dimension of 25 mm × 33 mm for VSWR < 2, observing a SWB frequency. A good combination is noticed between simulation and measurement. The simple construction, sharply, surface current flow, much impedance bandwidth, nearly omnidirectional radiation patterns, stable peak gain (3.20-6.22 dBi) and a considerable bandwidth dimension ratio (≥ 2062. 22) are a good deal sounder than the existing super wideband antennas which make it appropriate for many wireless communication systems such as L, C, X, UWB, Ku, and SWB bands. Full Text Link: http://doi.org/10.3233/JAE-140188
A compact monopole antenna with improved bandwidth for Ku band applications
(Universiti Kebangsaan Malaysia, 2015) Islam, M. M.; Islam, M. T.; Samsuzzaman, M.; Faruque, M. R. I.
A compact monopole antenna has been presented with improved bandwidth for Ku-band applications. The proposed Ku-band antenna is made of rectangular slots and circular slots on the ground and the patch, respectively, by a microstrip line of 50 Ω. It is designed on a printed circuit board of 15 mm × 15 mm× 1.6 mm using FR4 as a substrate material. High Frequency Structural Simulator (HFSS) is commercially available, which has been considered in this study depending on the concept of the Finite Element Method (FEM). 2.70 GHz (14.10 GHz to 16.80 GHz) is the achieved bandwidth of the proposed Ku-band antenna. The average gain is 3.66 dBi where 3.94 dBi is the maximum gain. The proposed Ku-band patch antenna exhibits smooth current distribution and durable nearly Omni-directional radiation patterns.
A negative index metamaterial antenna for UWB microwave imaging applications
(Wiley, 2015-03-27) Islam, M. M.; Islam, M. T.; Samsuzzaman, M.; Faruque, M.R.I.
In this article, a negative index metamaterial antenna ispresented for ultrawideband (UWB) microwave imaging applications.Four left-handed (LH) metamaterial (MTM unit cells are located alongone axis of the antenna as the radiating element. Each left-handed meta-material unit cell assembles a modified split-ring resonator with acapacitance-loaded strip to obtain a design architecture that at a timeshows both negative permittivity and negative permeability, whichassures the stable negative refractive index to raise the antenna per-formance for microwave imaging. The antenna structure of dimension16 3 21 3 1.6 mm3is printed on low dielectric FR4 material with aslotted ground plane and a microstrip feed. Measured reflection coeffi-cient illustrates that this antenna attains 114.5% bandwidth covering thefrequency band of 3.4–12.5 GHz for a voltage standing wave ratio lessthan 2 with a maximum gain 5.16 dBi at 10.15 GHz. There is a stable harmony between simulation and measured results and improved nearlyomnidirectional radiation characteristics within the operational fre-quency band. The stable surface current distribution, negative refractiveindex characteristic, considerable gain, and radiation property havemade this proposed negative index metamaterial antenna distinguishablefor UWB microwave imaging applications. Full Text Link: http://doi.org/10.1002/mop.29095
A new metasurface based on meta‐atom cluster for terahertz applications
(Wiley, 2017-05-27) Islam, M. M.; Faruque, M. R. I.; Islam, M. T.
In the manuscript, a new metasurface is presented for terahertz applications based on meta‐atom cluster. The metasurface having magnetic and electric resonances shows left‐handed metamaterial characteristics in the terahertz frequency. The meta atom cluster consists of split‐ring resonators based on conducting wire strip (a single loop) printed on RT5880LZ substrate material. The permeability and the permittivity are picked out from the complex scattering parameters. The calculation of the unloaded Q‐factor is executed for the meta‐atom cluster based metasurface in the terahertz frequency. The test of the metasurface has been performed using different dielectric samples loaded. Effective change has been realized in the transmission. This metasurface is novel in case of terahertz band due to left‐handed characteristics. This metasurface is appropriate for high‐performance filters and sensors due to high Q‐factors. Full Text Link: https://doi.org/10.1002/mop.30664
Circularly polarized high gain S band antenna for nanosatellite
(IOS Press, 2015) Samsuzzaman, M.; Islam, M. T.; Nahar, M. K.; Mandeep, J.S.; Mansor, F.; Islam, M. M.
A circular polarized highly directional S band patch antenna for small satellite applications has been proposed in this invention. The proposed antenna comprises of a square ground plane and two circular radiating patches with annular circular slot fed by a coaxial probe. The circular slot in the radiating patch is responsible for creating resonance at the S band. The prototype is can be easily integrated with a small satellite due to the simplicity of the design. The modification of the circular shape patch by cutting circular shape slots help to excite the resonance at the desired frequency. The simulation and the experimental results have a good agreement. The proposed antenna has achieved an impedance bandwidth of 55 MHz (2.380 GHz-2.435 GHz) and axial ratio (AR) < 3 dB is about 35 MHz (2.410 MHz-2.445 MHz) in the operating band. The prototype has achieved a gain of 8.13 dBi at centre frequency of 2.42 GHz. The directional radiation pattern, circular polarization (CP), and high gain characteristics make the proposed antenna suitable for small satellite applications. Full Text Link: http://doi.org/10.3233/JAE-140147
Compact and broadband antenna using double-negative transmission line metamaterial
(Springer, 2016-12-19) Islam, M. M.; Faruque, M. R. I.; Islam, M. T.; Mansor, M. F.
In this manuscript, double-negative transmission line (TL) metamaterial-inspired antenna has been proposed with compactness and improved bandwidth. This antenna is made of double-negative meander lines, microstrip feed and partial ground. Double-negative TL metamaterials show negative permittivity and permeability simultaneously and play important role for antenna miniaturization and the impedance bandwidth improved. The antenna provides 600 MHz bandwidth (−10 dB) with 23.81% fractional bandwidth. The antenna radiating element size is 0.07λ × 0.07λ at 2.51 GHz frequency with 3.72 dBi maximum gain where the electrical dimension is 0.30λ × 0.30λ. Full Text Link: https://doi.org/10.1007/s00339-016-0616-4
Design of a triple frequency band patch antenna on FR4 substrate material
(IEEE, 2014-03-06) Islam, M. M.; Islam, M. T.; Faruque, M. R. I.
In this paper, a triple frequency band patch antenna has been presented on FR4 substrate material. The proposed antenna has been designed on 40 mm× 40 mm printed circuit board and has been excited by microstrip line. High frequency structural simulator (HFSS) based on the finite element method (FEM) has been adopted. This antenna has been composed of circular and rectangular slots to generate multiple resonances. Return loss has been obtained below -10 dB from 9.52 GHz to 16.63GHz. The result has achieved stable Omni directional radiation pattern. The proposed multiband patch antenna has been discussed in details. Full Text Link: http://doi.org/10.1109/RFM.2013.6757282
Design of an UWB Patch Antenna for Dual Frequency Operations
(Maxwell Scientific Publication Corp., 2014-01-27) Islam, M. M.; Islam, M. T.; Faruque, M.R.I.
The purpose of this study is to present the development of an Ultra-Wide Band (UWB) patch antenna for dual frequency operations. The size of the proposed antenna is 40×40×1.6 mm3 and is excited by micros trip line. The Finite Element Method(FEM) based on high frequency electromagnetic simulation software is used in this investigation. Return loss is obtained below -10 dB from 8.39 to 9.7 GHz. It has achieved stable radiation efficiency 84% with gain 3.81 dB and 4.25 dB in the operating frequency band. The antenna generates two separate resonant frequencies to cover UWB band (3.1-10.6 GHz). Lower resonant mode of the antenna has an impedance bandwidth of 940 MHz (9-8.06 GHz) and the upper resonant mode has a bandwidth of 1 GHz (10.08-9.08 GHz). Full Text Link: http://doi.org/10.19026/rjaset.7.323
EFFECT 01<'SELECTED SOIL AMENDMENTS ON SEED GERMINATION, SEEDLING GROWTH AND CONTROL OF DAMPING OFF OF CHILI SEEDLINGS
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) Islam, M. T.; Faruque, A. N.
Soil amendments with sand, ash, sawdust, cowdung, poultry refuse, neem compost. vermicompost and control were evaluated for seed germination, seedling growth and control of damping off disease of chili. Soil application of poultry refuse (T6). neem compost (T,) and vermicompost (To) showed better performance in controlling damping off of seedlings as well as increased seed germination and influenced growth characters of chili seedlings. The highest seedling population 78.00% at 12 DAS, 82.67% at 15 DAS and 90.33% at 18 DAS were recorded under the treatment Poultry refuse (T6), where seed germination was increased 43.57%, 24.63% and 34.82% over control. respectively. Poultry refuse reduced the damping off incidence by 100% at 20 DAS, 94.12% at 25 DAS and 89.46% at 30 DAS over control. Seedlings growth characters like shoot length, root length, seedling height. fresh shoot weight. fresh root weight and fresh seedling weight of chili were also enhanced by the application of poultry refuse. Application of neem compost and vermicompost also showed promising effect against damping off disease and also enhanced seed germination and growth characters of chili seedlings.
EFFECT OF SOME CULTURAL PRACTICES FOR THE MANAGEMENT OF MUNGBEAN YELLOW MOSAIC DISEASE
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2009-01) Islam, M. T.; Faruq, A. N.
A field experiment was conducted for the management of mungbean yellow mosaic disease under natural condition by using different cultural practices. The experiment was conducted at Sher-e-Bangia Agricultural University (SAU) farm, Dhaka. Mungbean variety BARI Mung-5 was used in the experiment. Four polyethylene mulch viz. white, black, yellow and blue sheet, two insect trap namely yellow pot trap and yellow cloth trap and retlective tapes were applied in the investigation. It was observed that all the treatments significantly reduced the incidence and severity of mungbean yellow mosaic disease and increased growth characters (Plant height, number of pods/plant, pod length and number of seeds/pod) and yield of mungbean. Among the different cultural practices yellow polyethylene mulch followed by yellow pot trap and yellow cloth trap performed better in respect of growth characters and yield. Yellow polyethylene mulch increased 25.84% yield of mungbean over untreated control.
EFFECT OF SOME SELECTED ECO-FRIENDLY TREATMENTS ON LEAF BLIGHT (Bipolaris sorokiniana) SEVERITY AND GRAIN YIELD OF WHEAT
(Sher-e-Bangla Agricultural University Research System (SAURES), Dhaka, Bangladesh, 2008-07) Yesmin, S.; Aminuzzaman, F. M.; Islam, M. R.; Islam, M. T.
An Experiment was conducted during 2006-2007 to study the effect of some eco-friendly treatments on severity of leaf bight (Bipolnris sorokinianm, number and weight of grain per spike and grain health of wheat. Seeds of wheat variety Kanchan were collected from a farmer of Bansal district. Apparently healthy seeds were sorted out from the seed lot. Both unsorted and apparently healthy seeds were treated with hot water at 50°C for 5 minutes, brine solution (2% wlv NaCI) for 15 minutes, sun drying for 14 hours and polythene solarization for 14 hours. Unsorted and apparently healthy seeds were planted and 0.05% boron solution was applied as foliar spray at tillering stage. Two checks were maintained, unsorted and apparently healthy seeds, and planted without any treatment. At all stages of data collection. the highest severity of leaf blight on flag leaf and penultimate leaf were recorded under control. where unsorted and untreated seeds were planted followed by the treatment where apparently healthy seeds were planted without any treatment. Other treatments caused significant reduction in leaf blight severity and percentage of diseased seeds as compared to control. The treatments gave significant increase in number and weight of grain per spike and percentage of healthy grain. Considering the above parameters, pre-sowing treatment of apparently healthy seeds with hot water, brine or sundrying were noted as effective ceo-friendly methods to reduce leaf blight severity and to increase grain yield and healthy seeds of wheat.
EFFECT OF WHEEL ALIGNMENT, SPEED AND ROAD CONDITION ON FUEL EFFICIENCY OF A LIGHT-DUTY VEHICLE
(Department of Mechanical Engineering, Oct-2022) Das, R. K.; Hossain, M. A. Mowazzem; Islam, M. T.; Banik, S. C.
The fuel efficiency of a TOYOTA ECHO PLUS-2ZZ-GE-02 model light-duty vehicle was investigated
Microstrip line‐fed fractal antenna with a high fidelity factor for UWB imaging applications
(Wiley, 2015-08-28) Islam, M. M.; Islam, M. T.; Samsuzzaman, M.; Faruque, M. R. I.; Misran, N.
A printed microstrip line‐fed fractal antenna is presented with a high fidelity factor for UWB applications. The antenna structure of electrical dimension 0.24 λ × 0.33 λ at lower frequency 3.1 GHz is made of a fractal patch, a slotted partial ground plane, and a microstrip feed, which is fabricated on FR4 material of low cost and dielectric. Measured results demonstrates that the fractal antenna achieves fractional bandwidth of 117.88% covering the frequency range from 3.1 GHz to more than 12 GHz with a maximum gain 3.54 dBi at 6.25 GHz. An acceptable analogy is observed between measured and simulation results. The high fidelity factor, sharply surface current distribution, time domain performances, acceptable gain, and nearly omnidirectional radiation characteristic have validated the appropriateness of this proposed fractal antenna for UWB and microwave imaging applications. Full Text Link: https://doi.org/10.1002/mop.29401
Ultra-wideband to super-wideband antenna convebsion using parasitic elements
(Universiti Kebangsaan Malaysia, 2015) Faruque, M.R.I.; Islam, M. M.; Islam, M. T.; Samsuzzaman, M.
Researchers from an university in Malaysia convert an ultra-wideband (UWB) antenna into a super-wideband (SWB) antenna by placing a parasitic element on the ground plane. The super-wideband antenna radiates in a near omnidirectional manner. The antenna has been printed on both sides of a dielectric FR4 substrate 1.6 mm thick, and with permittivity of 4.6 and loss tangent of 0.02.