Browsing by Author "Faruque, M.R.I."

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5.5GHZ notched wlan-band uwb antenna USIN6 slotted rectangular split-ring resonators
(Universiti Kebangsaan Malaysia, 2014-09-01) Islam, M.M.; Faruque, M.R.I.; Islam, M.
Theoretical physicist Sir John was the first to identify a practical way to create metamaterials, or materials engineered for specific applications. Spatial filter can be used to filter out the interfering bands. The US Federal Communications Commission (FCC) has allocated the 3.1-10.6GHzfrequency band for unlicensed radio communication, offering a new opportunity in short-distance wireless communications. An absorbing boundary condition is applied to the propagation regions, and periodic boundary conditions are applied to reduce the computational domain. From the analysis it can be observed that both incident polarizations can generate a notched band.
A Compact 5.5 GHz Band-Rejected UWB Antenna Using Complementary Split Ring Resonators
(Hindawi, 2014-05-22) Islam, M. M.; Faruque, M.R.I.; Islam, M.T.
A band-removal property employing microwave frequencies using complementary split ring resonators (CSRRs) is applied to design a compact UWB antenna wishing for the rejection of some frequency band, which is meanwhile exercised by the existing wireless applications. The reported antenna comprises optimization of a circular radiating patch, in which slotted complementary SRRs are implanted. It is printed on low dielectric FR4 substrate material fed by a partial ground plane and a microstrip line. Validated results exhibit that the reported antenna shows a wide bandwidth covering from 3.45 to more than 12 GHz, with a compact dimension of 22 × 26 mm2, and VSWR < 2, observing band elimination of 5.5 GHz WLAN band. Full Text Link: http://dx.doi.org/10.1155/2014/528489
A compact disc-shaped printed antenna using parasitic element on ground plane for super wideband applications
(ACES, 2016-08) Islam, M. M.; Faruque, M.R.I.; Islam, M.T.
A microstrip line-fed monopole antenna is proposed and investigated using a structure of parasitic element for super-wideband applications. 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 monopole 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 an extended ultra-wideband frequency. A good combination is noticed between simulation and measurement. This proposed SWB antenna delivers impedance bandwidth covering the L, C, X, Ku bands and points out sharply surface current flow and nearly omnidirectional radiation patterns, which is appropriate for UWB or SWB applications.
A Double Inverted F-Shape Patch Antenna for Dual-Band Operation
(Hindawi, 2014-04-27) Islam, M.M.; Faruque, M.R.I.; Hueyshin, W.; Mandeep, J. S.; Islam, T.
A double inverted F-shape patch antenna is presented for dual-band operation. The proposed antenna is comprised of circular and rectangular slots on a printed circuit board of 40 mm × 40 mm × 1.6 mm with a 50 Ω microstrip transmission line. Commercially available high frequency structural simulator (HFSS) based on the finite element method (FEM) has been adopted in this investigation. It has a measured impedance bandwidths (2 : 1 VSWR) of 18.53% on the lower band and 7.8% on the upper band, respectively. It has achieved stable radiation efficiencies of 79.76% and 80.36% with average gains of 7.82 dBi and 5.66 dBi in the operating frequency bands. Moreover, numerical simulations have been indicated as an important uniformity with measured results. Full Text Link: http://dx.doi.org/10.1155/2014/791521
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
Circularly polarized patch antenna for S-band satellite applications
(IEEE, 2015-10-01) Azim, R.; Samsuzzaman, M.; Alam, T.; Islam, M.T.; Faruque, M.R.I.; Zaman, M. R.; Islam, M. M.
In this paper, a circularly polarized antenna is proposed for satellite communication system. Commercially available Finite Integration Technique (FIT) based software Computer Simulation Technology (CST) microwave studio and finite element method solver based High Frequency Structural Simulator (HFSS) have been used in this analysis. The proposed antenna achieved 3dB axial ratio of 30 MHz with -10dB reflection coefficient. The axial ratio and reflection coefficient has been verified with both CST and HFSS simulation software. The operating frequency of the proposed antenna is 2.35 GHz. The antenna has been printed on FR-4 (lossy) Substrate material with relative Permittivity of 4.6 and thickness of 1.6 mm. The proposed antenna exhibits a 3 dB axial-ratio beam width of more than 1420. Full Text Link: http://doi.org/10.1109/IconSpace.2015.7283837
Compact metamaterial antenna for UWB applications
(IEEE, 2015-08-06) Islam, M.M.; Islam, M.T.; Samsuzzaman, M.; Faruque, M.R.I.
A compact antenna is proposed using planar-patterned metamaterial structures for ultra-wideband applications. This antenna consists of four metamaterial unit cells that simultaneously show both negative permeability and negative permittivity on the triangular patch and three rectangular slots on the partial ground plane fed with a microstrip line. It has a wide bandwidth from 3.07 to 19.91 GHz for voltage standing wave ratio (VSWR) <;2 and an average gain of 5.62 dBi with a peak of 8.57 dBi because of using planar-patterned metamaterial structures. Good agreement between computations and experiments is realised convincing that the antenna can operate over a wide bandwidth with planar-patterned metamaterial structures and compact size (0.28 λ × 0.19 λ × 0.02 λ ). Full Text Link: http://doi.org/10.1049/el.2015.2131
Design of a Ku-band patch antenna with enhanced bandwidth
(Universiti Kebangsaan Malaysia, 2014-03-27) Islam, M. M.; Faruque, M.R.I.; Aziz, R.; Islam, M.T.; Alam, T.
In this paper, a Ku-band patch antenna with Enhanced bandwidth has been proposed. The proposed Ku-band antenna is made of rectangular slots and circular slots on the ground and the patch, respectively with a microstrip line of 50 O. It is designed on a printed circuit board of 40 mm × 40 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). 1.75 GHz (14.58 GHz to 16.33 GHz) is the achieved bandwidth of the proposed Ku-band antenna. The average gain is 1.85 dB where 2.90 dB is the maximum gain. The proposed Ku-band patch antenna shows durable omni-directional radiation patterns. The proposed patch antenna has been discussed in detail.
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
Design of an X-band microstrip patch antenna with enhanced bandwidth
(IEEE, 2014-03-03) Islam, M.M.; Islam, M.T.; Faruque, M.R.I.; Hueyshin, W.
In this paper, an X-band microstrip patch antenna has been presented with enhanced bandwidth. The proposed antenna is designed on 40 mm×40mm printed circuit board and is excited by microstrip line. Commercially available High Frequency Structural Simulator (HFSS) is adopted in this study This antenna is composed of rectangular and circular slots to generate two resonances and to increase bandwidth in the desired band. Return loss -17.14 dB and -14.29 dB are obtained below -10 dB in the desired X-band (8GHz-12GHz). It has achieved stable radiation efficiency 78.85% with average peak gain 4.31 dBi in the operating frequency band. The proposed antenna has an impedance bandwidth 1.59 GHz. The proposed X-band patch antenna is discussed and presented in detail. Full Text Link: http://doi.org/10.1109/ICAEE.2013.6750355
Detection of breast cancer using electromagnetic techniques: A review
(IOS Press, 2016-07-08) Islam, M.M.; Faruque, M.R.I.; Misran, N.; Islam, M.T.
Breast cancer is the most well-known malignancy of non-skin and the second leading reason of cancer death among the women in the world after the lung cancer. In this review, the development of the microwave imaging system is described for breast cancer detection depending on the ultra-wideband imaging system, which is a promising emerging technology that uses the dielectric contrast between malignant, benignant and normal fibro glandular breast tissues at the microwave frequencies. Some breast cancer detection techniques such as Magnetic Resonance Imaging (MRI), Mammography, Ultra-Wide Band (UWB), Ultrasound and their performances have also been reviewed. There are some restrictions of the existing UWB imaging systems such as they have no ability to detect the breast tumor at the beginning period, having no 3D pictorial representation of tumor size in all systems and a multiple array antenna in respect of complex system. This encourages the improvement of the extended signal processing techniques for ultra-wideband imaging systems and initiates a more appealing imaging scenario. The limitations and running challenges of the microwave imaging system have been discussed completely with some feasible suggestions. Confidently, this thorough survey has been done here to overcome this limitations of the existing and proposed systems. Full Text Link: http://doi.org/10.3233/JAE-150050
Impact on Mental Health Due to COVID-19 Pandemic: A Cross-Sectional Study in Bangladesh
(Elsevier, 2023-07-20) Pathan, Refat Khan; Biswas, Munmun; Yasmin, Suraiya; Uddin, Mohammad Amaz; Das, Anindya; Khandaker, Mayeen Uddin; Faruque, M.R.I.; Sarker, Moniruzzaman
The government of Bangladesh has implemented the “Stay Home” policy following the WHO recommendation to resist the community transmission of Covid-19. As a result, the routine activities of all government, semi-government establishments, including educational institutions, are severely affected, and the country's economic growth becomes slowed down. To overcome such a situation, the relevant authorities have introduced the “Work from Home” policy for the employees and “Remote Education” for students. However, due to the persistence of multi-dimensional socio-economic problems, many employees and students face big challenges in performing their regular jobs while adopting such a policy. Consequently, enormous psychological anxiety has been developed for all people, including students, parents, employees, etc., and concurrently created severe changes in their behavior. This study aims to analyze the reasons for the behavioral changes of the employees, students, academic staff, and family members of different ages due to psychological anxiety, stress, or physical issues. A comprehensive online-based survey has been carried out on people working in various sectors in Bangladesh. A modified Apriori Algorithm has been used to sort out the associations between the causes and types of behavioral changes. Analyzed data revealed a massive human behavioral change in most participants. This finding indicates that the negligence of those significant human behavioral changes may cause a higher risk of creating psychological imbalance. Therefore, there is a need to have a solid understanding of the reasons for the behavioral changes and set up standard guidelines to maintain “Work from Home” in this Covid-19 situation to avoid psychological imbalance. Based on this study, some suggestions have been given for implementation by the government on an urgent basis.
Investigation of a planar antenna with bandwidth enhancement for X-band applications
(Universiti Kebangsaan Malaysia, 2014-05-01) Faruque, M.R.I.; Islam, M.M.; Islam, M.T.
Planar antennas play an important role in wireless communications systems and they continue to face shifting demands for a new generation of antenna technologies. One of the widely used antennas is the microstrip patch, as it offers a low profile, conformal design, ease of manufacture and integration, and it is low cost and lightweight. Its main disadvantages, however, are narrow bandwidth and low efficiency, so increasing its bandwidth is the main focus of many research projects. Work on the design of this type antennas continues, and various techniques are being used, including increased substrate thickness, changing the patch by cutting rectangular slots and the ground plane. The geometry of the proposed microstrip antenna was designed using equations from the transmission line model (TEM) approximation.
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.