Browsing by Author "Islam, Md. Moinul"

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A Miniaturized Antenna with Negative Index Metamaterial Based on Modified SRR and CLS Unit Cell for UWB Microwave Imaging Applications
(MDPI, 2015-01-23) Islam, Md. Moinul; Islam, Mohammad Tariqul; Samsuzzaman, Md.; Faruqu, Mohammad Rashed Iqbal; Misran, Norbahiah; Mansor, Mohd Fais
A miniaturized antenna employing a negative index metamaterial with modified split-ring resonator (SRR) and capacitance-loaded strip (CLS) unit cells is presented for Ultra wideband (UWB) microwave imaging applications. Four left-handed (LH) metamaterial (MTM) unit cells are located along one axis of the antenna as the radiating element. Each left-handed metamaterial unit cell combines a modified split-ring resonator (SRR) with a capacitance-loaded strip (CLS) to obtain a design architecture that simultaneously exhibits both negative permittivity and negative permeability, which ensures a stable negative refractive index to improve the antenna performance for microwave imaging. The antenna structure, with dimension of 16 × 21 × 1.6 mm3, is printed on a low dielectric FR4 material with a slotted ground plane and a microstrip feed. The measured reflection coefficient demonstrates that this antenna attains 114.5% bandwidth covering the frequency band of 3.4–12.5 GHz for a voltage standing wave ratio of less than 2 with a maximum gain of 5.16 dBi at 10.15 GHz. There is a stable harmony between the simulated and measured results that indicate improved nearly omni-directional radiation characteristics within the operational frequency band. The stable surface current distribution, negative refractive index characteristic, considerable gain and radiation properties make this proposed negative index metamaterial antenna optimal for UWB microwave imaging applications. Full Text Link: https://doi.org/10.3390/ma8020392
A Negative Index Metamaterial-Inspired UWB Antenna with an Integration of Complementary SRR and CLS Unit Cells for Microwave Imaging Sensor Applications
(MDPI, 2015-05-20) Islam, Mohammad Tariqul; Islam, Md. Moinul; Samsuzzaman, Md.; Faruque, Mohammad Rashed Iqbal; Misran, Norbahiah
This paper presents a negative index metamaterial incorporated UWB antenna with an integration of complementary SRR (split-ring resonator) and CLS (capacitive loaded strip) unit cells for microwave imaging sensor applications. This metamaterial UWB antenna sensor consists of four unit cells along one axis, where each unit cell incorporates a complementary SRR and CLS pair. This integration enables a design layout that allows both a negative value of permittivity and a negative value of permeability simultaneous, resulting in a durable negative index to enhance the antenna sensor performance for microwave imaging sensor applications. The proposed MTM antenna sensor was designed and fabricated on an FR4 substrate having a thickness of 1.6 mm and a dielectric constant of 4.6. The electrical dimensions of this antenna sensor are 0.20 λ × 0.29 λ at a lower frequency of 3.1 GHz. This antenna sensor achieves a 131.5% bandwidth (VSWR < 2) covering the frequency bands from 3.1 GHz to more than 15 GHz with a maximum gain of 6.57 dBi. High fidelity factor and gain, smooth surface-current distribution and nearly omni-directional radiation patterns with low cross-polarization confirm that the proposed negative index UWB antenna is a promising entrant in the field of microwave imaging sensors. Full Text Link: https://doi.org/10.3390/s150511601
A Parametric Study of Compact UWB Antenna with Multiple Notched-Band Functions
(Springer, 2016-06-19) Islam, Md. Moinul; Islam, Mohammad Tariqul; Faruque, Mohammad Rashed Iqbal
In the paper, a parametric study of compact UWB antenna is conducted with multiple notched-band functions. Three notch bands at 3.6, 7.5, and 8.3 GHz frequencies have been attained with three slots on the radiating patch whereas two notch bands at 5.2 and 5.8 GHz frequencies have been acquired with two slots on the partial ground plane. This proposed antenna covers impedance bandwidth (VSWR ˂ 2) from 3.06 to 10.67 GHz with notch band 3.4–3.8 GHz (WiMAX), 5.1–5.35 GHz (WLAN), 5.6–6 GHz (WLAN), 7.15–7.65 GHz (X-band satellite communication) and 8.05–8.65 GHz (ITU 8-GHz band) whereas the overall antenna size is 25 mm × 31 mm. The parametric studies are executed depending on the surface current flow and design parameters of slots. Full Text Link: https://doi.org/10.1007/978-3-319-32213-1_14
Bandwidth enhancement of a microstrip antenna for x-band applications
(Semantic Scholar, 2013-08) Islam, Md. Moinul; Islam, Mohammad Tariqul; Faruque, Mohammad Rashed Iqbal
An X-band microstrip antenna for bandwidth enhancement is presented in this paper. The proposed antenna is comprised of circular and rectangular slots fed by a 50 Ω microstrip line. It is designed on 40 mm × 40 mm printed circuit board using FR4 substrate material. Commercially available high frequency electromagnetic solver HFSS based on the finite element method (FEM) is taken into account in this study. The impedance bandwidth (VSWR≤2) of the proposed antenna is 2.10 GHz (9.75 to 11.85 GHz). 1.85 dB is the average gain where maximum gain is 2.3 dB. The proposed antenna exhibits stable Omni-directional radiation pattern.
Bio-plastic composite substrate material based microstrip-fed printed antenna for wireless communications
(Researchgate, 2017) Alam, Touhidul; Faruque, Mohammad Rashed Iqbal; Alam, Mohammed Shamsul; Islam, Md. Moinul; Mahmud, Md. Zulfiker; Islam, Mohammad Tariqul
This paper presents a printed bio-plastic wireless antenna to ensure biological compatibility between humans and wireless devices. The antenna has multiband characteristics, which can cover the GSM 1800, UMTS (1.92-2.17 GHz), LTE 40 frequency bands. The proposed antenna is incorporated with a circular slotted hexagonal radiator with a microstrip feed line and a rectangular slotted ground plane. The wireless mobile antenna has been designed and simulated using the commercially available electromagnetic (EM) simulation software CST Microwave Studio. The EM absorption rate of the proposed antenna has also been analysed with a human head phantom. Full Text Link: http://doi.org/10.17222/mit.2015.271
Bird Face Microstrip Printed Monopole Antenna Design for Ultra Wide Band Applications
(De Gruyter, 2016-08-11) Hossain, Mohammad Jakir; Faruque, Mohammad Rashed Iqbal; Islam, Md. Moinul; Islam, Mohammad Tariqul; Rahman, Md. Atiqur
In this paper, a novel bird face microstrip printed monopole ultra-wideband (UWB) antenna is investigated. The proposed compact antenna consists of a ring-shaped with additional slot and slotted ground plane on FR4 material. The overall electrical dimension of the proposed antenna is 0.25 λ×0.36 λ×0.016 λ and is energized by microstrip feed line. The Computer Simulation Technology (CST) and the High Frequency Structural Simulator (HFSS) is applied in this analysis. The impedance bandwidth of the monopole antenna cover 3.1–12.3 GHz (9.2 GHz, BW) frequency range. The messurement displayed that the designed antenna achieved excellent gain and stable omnidirectional radiation patterns within the UWB. The maximum gain of 6.8 dBi and omnidirectional radiation pattern makes the proposed antenna that is suitable for UWB systems. Full Text Link: https://doi.org/10.1515/freq-2016-0113
Compact Wrench-Shaped Resonator Loaded UWB Antenna with Notched Frequency Characteristics
(Universiti Teknikal Malaysia Melaka, 2016) Islam, Md. Moinul; Islam, Mohammad Tariqul; Faruque, Mohammad Rashed Iqbal; Islam, Sikder Sunbeam; Misran, Norbahiah
In the manuscript, the design of a wrench-shaped resonator loaded ultra-wideband (UWB) antenna has been proposed using notched frequency characteristics. The antenna is composed of the patch with microstrip feed line, a wrench-shaped resonator, and a slotted partial ground plane. A notched frequency is created due to the electromagnetic coupling of wrench-shaped resonator. In order to observe the effects of wrench-shaped resonator, a parametric study has been executed. Measured results are compared with simulations (with and without notched bands) and a stable similarity has been observed. The surface current, radiation patterns and the impedance (imaginary and real) have ensured the compression of wanted notched frequency bands.
Design and implementation of a hand gesture-controlled wheelchair
(BRAC University, 2025-01) Shil, Rohit; Islam, Md. Moinul; Mamun, Abdullah Al; Mahamud, Arian; Rahman, Touhidur; Alam, Shahed
The head movement-controlled electric wheelchair is a significant advancement in helping enhance the mobility of disabled persons. This ingenious system involves a cap-mounted accelerometer hooked up to an Arduino Nano microcontroller, which detects movements and maps them to directional instructions. This enables the exact functioning of motors with the help of a dual motor driver which is powered by a 24V battery. To guarantee the safety of the device, a voltage regulation mechanism on the exporting side acts to protect components by holding power at a specific point. Thanks to adaptive code logic, the hands-free device is made smoother and more stable throughout the project. The joystick-free system benefits user function ability but could be a cause for concern for users with a restricted hand motion. A completely new hardwired configuration (and some coding to eliminate signal noise while moving). This outcome is a cost-effective, intuitive solution that significantly enhances independence and quality of life for the end-user. This device effectively solves the theoretical problem of helping the impaired navigate through a combination of planning and design, which is what makes it such a unique solution.
Design of a compact UWB antenna with a partial ground plane on epoxy woven glass material
(De Gruyter, 2015-06-01) Islam, Md. Moinul; Islam, Mohammad Tariqul; Faruque, Mohammad Rashed Iqbal; Aldhaheri, Rabah W.; Samsuzzaman, Md.
A compact ultra-wideband (UWB) antenna is presented in this paper with a partial ground plane on epoxy woven glass material. The study is discussed to comprehend the effects of various design parameters with explicit parametric analyses. The overall antenna dimension is 0.22×0.26×0.016 λ. A prototype is made on epoxide woven glass fabric dielectric material of 1.6 mm thickness. The measured results point out that the reported antenna belongs to a wide bandwidth comprehending from 3 GHz to more than 11 GHz with VSWR<2. It has a peak gain of 5.52 dBi, where 3.98 dBi is the average gain. Nearly omnidirectional radiation patterns are observed within the operating frequency bands. A good term exists between simulation and measurement results, which lead the reported antenna to be an appropriate candidate for UWB applications. Full Text Link: https://doi.org/10.1515/secm-2014-0297
Effects of an epoxy-resin-fiber substrate for a -shaped microstrip antenna
(Materials and technology, 2016) Islam, Md. Moinul; Faruque, Mohammad R. I.; Islam, Mohammad Tariqul; Arshad, Haslina
A -shaped microstrip antenna using an epoxy-resin-fibre substrate is presented. The proposed antenna consists of a circular slot and two rectangular slots printed on a dielectric resin-fibre substrate and is excited by a 50- microstrip transmission line. A commercially available, high-frequency structural simulator (HFSS) based on the finite-element method (FEM) was used in this investigation. The nearly omni-directional and bidirectional radiation pattern exhibited average gains of 3.12 dBi and 5.44 dBi for the lower band and upper band, respectively. The effects of epoxy-resin-fiber are discussed through comparisons of different substrate materials. Full Text Link: http://doi.org/10.17222/mit.2014.206
Microwave Imaging Sensor Using Compact Metamaterial UWB Antenna with a High Correlation Factor
(2015-07-23) Islam, Md. Moinul; Islam, Mohammad Tariqul; Faruque, Mohammad Rashed Iqbal; Samsuzzaman, Md.; Misran, Norbahiah; Arshad, Haslina
The design of a compact metamaterial ultra-wideband (UWB) antenna with a goal towards application in microwave imaging systems for detecting unwanted cells in human tissue, such as in cases of breast cancer, heart failure and brain stroke detection is proposed. This proposed UWB antenna is made of four metamaterial unit cells, where each cell is an integration of a modified split ring resonator (SRR), capacitive loaded strip (CLS) and wire, to attain a design layout that simultaneously exhibits both a negative magnetic permeability and a negative electrical permittivity. This design results in an astonishing negative refractive index that enables amplification of the radiated power of this reported antenna, and therefore, high antenna performance. A low-cost FR4 substrate material is used to design and print this reported antenna, and has the following characteristics: thickness of 1.6 mm, relative permeability of one, relative permittivity of 4.60 and loss tangent of 0.02. The overall antenna size is 19.36 mm × 27.72 mm × 1.6 mm where the electrical dimension is 0.20 λ × 0.28 λ × 0.016 λ at the 3.05 GHz lower frequency band. Voltage Standing Wave Ratio (VSWR) measurements have illustrated that this antenna exhibits an impedance bandwidth from 3.05 GHz to more than 15 GHz for VSWR < 2 with an average gain of 4.38 dBi throughout the operating frequency band. The simulations (both HFSS and computer simulation technology (CST)) and the measurements are in high agreement. A high correlation factor and the capability of detecting tumour simulants confirm that this reported UWB antenna can be used as an imaging sensor. Full Text Link: https://doi.org/10.3390/ma8084631
New NRI Metamaterial for Multi-band Operation
(Universiti Teknikal Malaysia Melaka, 2016) Islam, Sikder Sunbeam; Faruque, Mohammad Rashed Iqbal; Islam, Mohammad Tariqul; Islam, Md. Moinul; Misran, Norbahiah
A new negative refractive index (NRI) metamaterial unit cell is presented in this study. The negative refractive index property is being displayed by the unit cell of metamaterial in the four distinct microwave frequency bands. Finite integration technique was adopted to evaluate the property of the material. More than 1 GHz bandwidth region was found exhibiting NRI property for the material in the microwave spectra.
Numerical analysis of dynamic response and wave-load on multihull ship advancing in waves
(Department of Naval Architecture and Marine Engineering, 2021-12-18) Islam, Md. Moinul; Zakaria, Dr. Nayeb Md. Golam
The motion response of a vessel traveling at forward velocity in a seaway is critical in assessing the vessel's operability, and determining the motion response during the preliminary design stage of every vessel ensures the safety of not only the passengers and crew, but also the cargo the ship is carrying. With advancement in ship design, vessels with orthogonal design characteristics, i.e., vessels with multi hulls, are being constructed and operated frequently now-a-days. As multihull vessels offer advantages like additional deck area and added transverse stability, they are becoming popular for sea travels and as such assessing the seakeeping characteristics of these vessels are of great importance. Which is why the aim of this research is to develop a robust numerical tool that is able to analyze the seakeeping characteristics of multihull vessels with acceptable engineering accuracy. The theory of ship motion has gone through radical advances through ages. Starting with strip theory, which was capable of analyzing ship motion at lower Froude number to 3D theories, which has the capability to incorporate the three-dimensional effects and can be used for a wider range of Froude number; there are multitude methods to apply for the development of a numerical code. The current research resorts to a widely used three-dimensional method, 3D Green Function method to develop the tool. The reason behind of choosing this method was the wide range of speed it can work in, the inherent capability of Green Function to satisfy a number of boundary condition and the fact that use of this method limits the meshing of the domain to only the wetted surface of the vessel. Previously, using the 3D Green Function method was challenging due to the lengthy computation time required; however, as computer processing power has increased exponentially, the Green Function method has become the obvious choice for ship motion analysis of multi-hull vessels. A number of vessels, both single hull and multi hull, were employed to assess the operability of the numerical tool developed through this research. A range of Wigley hulls were used to check the application on single hull vessels. For multihulls a number of catamarans, both mathematical model (Wigley Catamaran, Lewis Hull) and actual vessel (NPL catamaran, Delft 372 catamaran) were used to showcase the range of application. The analysis was run varying the demihull separation and varying the forward speed of the vessels. Additionally, trimaran vessel analyses were also run, to show that the application of the code was not confined to catamaran vessels only. The forward speed of the vessel was classified in three groups. Velocities less than Fn=0.20 was considered a low speed, for velocities 0.20.3 was considered as high speed. Wave contours were also generated to assess the wet deck slamming phenomenon of multi hull vessels. The results show that the developed tool would be an excellent tool in providing preliminary design decisions for all types of vessels. However, there are discrepancies among the observed results and experimental results. The reason lies in the underlying theory of the method applied. As 3D Green Function method is based on potential flow theory, which assumes the fluid to be an ideal one whereas the experimental values are for real fluid. Still the numerical tool will be great addition in assessing the seakeeping characteristics of vessels.
Printed microstrip line-fed patch antenna on a high-dielectric material for c-band applications
(Materials and technology, 2016) Islam, Md. Moinul; Faruque, Mohammad Rashed Iqbal; Mansor, Mohd Fais; Islam, Mohammad Tariqul
A printed microstrip line-fed patch antenna for C-band applications is presented, using a high-dielectric material. The proposed antenna dimensions are 0.53 × 0.53 × 0.02 and it is fed by a microstrip line. The antenna outline and electromagnetic analysis were done with the help of a commercially available computer-aided EM simulator. This antenna initiates three resonances at 4.64 GHz, 5.52 GHz, and 6.34 GHz with the average gains of 2.68 dBi, 6.02 dBi and 4.83 dBi, respectively, covering the entire frequency bands. The overall performance analysis and a nearly omnidirectional radiation pattern prove that the proposed antenna is promising for C-band applications. Full Text Link: http://doi.org/ 10.17222/mit.2014.199
Simulation and bit error rate performance analysis of 4G OFDM systems
(IEEE, 2009-03-21) Ali, Md. Sadek; Rahman, Md. Mahbubur; Hossain, Md. Delowar; Islam, Md. Shariful; Islam, Md. Moinul
In this paper a simulation based system developed for analysis and bit error rate (BER) performance measurement of orthogonal frequency division multiplexing (OFDM) systems. This paper involves the basics of OFDM system. In this paper bit error rate is calculated and measured with respect to Signal to Noise Ratio (SNR), Doppler Effect, and guard interval. BPSK, QPSK and 16PSK are used as modulation techniques. Additive White Gaussian Noise (AWGN) is used as a communication channel. The effect of SNR, Doppler Effect, and guard intervals on OFDM signals improves the system performance. Full Text Link: http://doi.org/10.1109/ICCITECHN.2008.4803021
Skin Disease Detection Using Deep Learning.
(Daffodil International University, 2024-07-24) Selim, Md. Tarikul Islam; Islam, Md. Moinul
For successful treatment and better patient outcomes, skin disorders must be identified early and accurately. Conventional diagnostic techniques, which mostly depend on dermatologists' visual inspection, are frequently arbitrary and based on the expertise of the practitioner. The application of deep learning models such as CNN, VGG16, MobilenetV2, and Densenet121 for automated skin disease identification from dermatoscopic pictures is investigated in this work. Our methodology allows the models to recognize complex patterns and characteristics typical of different skin disorders. We overcome the difficulties caused by sparse and unbalanced datasets by applying transfer learning and data augmentation strategies, guaranteeing strong model performance across several skin disease categories. When tested on a small picture dataset, the suggested CNN-based system outperforms conventional machine learning techniques in terms of accuracy, sensitivity, and specificity. Furthermore, the model offers graphical explanations to support its predictions, improving interpretability and building medical experts' confidence. According to the findings, deep learning may greatly enhance the early diagnosis and screening of skin conditions, providing a trustworthy instrument for initial screening and diagnosis. Because it makes fast and accurate therapeutic interventions possible, this development has the potential to save healthcare expenditures while also improving patient care. We demonstrate the efficiency of our technique by correctly and robustly classifying a broad spectrum of skin illnesses through a comprehensive performance evaluation
SweetSight: A Deep Convolutional Neural Network Approach for Automatic Categorization of Bengal Sweets
(Scopus, 2024-08-20) Supriya, Soummo; Rimi, Iffat Firozy; Islam, Md. Moinul; Rahman, Md. Sadekur; Nawshin, Samia; Habib, Md. Tarek
The manufacture of a wide variety of sweets is on the rise in the entire Bengal (both Bangladesh and West Bengal). As a consequence, the sweet’s name escapes the vast majority of individuals in our country. Computer vision advancements have made object recognition from photos easier in recent years. Using computer vision to automatically categorize sweets is still a challenge because of the similarity between various sorts and characteristics such as their placement or lighting conditions. Classifying sweets may be useful in a variety of domains, including autonomous economic robots and the creation of mobile apps for identifying certain sweets on the market. In this article, we employed deep convolutional neural network (DCCN) methods to evaluate five alternative models for sweet detection. The endemic Bengali delicacies we used to train my model included Inception-v3, ResNet-50, VGG15, AlexNet, and CNN. This model was efficient. Our dataset comprised images of confections from thirteen distinct sweet categories. Two portions of the dataset were separated: 80% for training and 20% for testing. The training dataset was enhanced and increased to make preparation simpler. Using the Inception-v3 model, we were able to attain a 100% accuracy rate with our dataset.