Siti Zuraidah Ibrahim
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Siti Zuraidah Ibrahim
Official Name
Siti Zuraidah, Ibrahim
Alternative Name
Ibrahim, Siti Zuraidah
Binti Ibrahim, Siti Zuraidah
Ibrahim, Siti Z.
Ibrahim, S. Z.
Main Affiliation
Scopus Author ID
35193912700
Researcher ID
DUU-6589-2022

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  • Publication
    IoT-Based Blood Glucose Detection System
    ( 2023-01-01)
    Lim S.
    ;
    Siti Zuraidah Ibrahim
    ;
    Mohd Nazri A. Karim
    ;
    Boonsong W.
    ;
    Masrakin K.
    ;
    Mohd Noh F.H.
    This study presents a non-invasive blood glucose concentration (BGC) system that is based on the Internet of Things (IoT) and employs near-infrared sensors (NIR) to detect blood glucose levels through the scanning of fingers. The purpose is to develop a BGC system and assess the accuracy of the proposed system. Constant monitoring and data-driven insights for optimum treatment and enhanced quality of life are made possible by IoT-based systems, and non-invasive glucose monitoring is a critical component of diabetes care. The system that was built comprises of a Light Emitting Diode (LED) that emits signals that are sent via the fingertip, and a phototransistor that is positioned next to the LED to detect any reflected signals. The results of the scanning are then stored in ThingSpeak. The technique used to determine the blood glucose level involves analyzing the variation in received signal intensity that results from reflection. Using regression analysis, a mathematical relationship between glucose concentration and voltage was established and installed in the Arduino. Two sorts of testing were carried out to evaluate the system: in vitro tests on glucose solution and in vivo experiments on the human body. By comparing 10 readings acquired from both types of experiments, the results of the studies indicate that the device's glucose detection accuracy ranges from 1.13 to 16.41%. IoT approach is feasible due to its continuous monitoring capabilities, data analysis, and remote access features, making it a promising tool for effective diabetes control.
  • Publication
    Design of Ultra-Wideband Monopole Antenna for EMC Application
    ( 2023-10-06)
    Wee Fwen Hoon
    ;
    Yew B.S.
    ;
    Siti Zuraidah Ibrahim
    ;
    Lee Y.S.
    In this era of technology, EMC application have become more important because the increase of electronic devices due to the demand from users. Every electronic appliance is a source of radiated electromagnetic fields called radiated emission. Hence, it is important to make sure the radiation is in a safe level where an antenna will be used to detect the radiated electromagnetic fields. The existing antenna used for EMC testing such as log-periodic antenna, fractal antenna and biconical antenna have a large dimension that make it hard to set up for the testing and majority can only operate starting from 3 GHz and above. In order to overcome that problem, an ultra-wideband monopole patch antenna is proposed which aimed to be operated from 0.7 to 6.8 GHz for EMC testing. The UWB antenna can be achieved by having a truncated ground plane and notches at the ground structure. The edges of the rectangular patch antenna have been cut to improve the return loss and a tapered feed is implemented to increase the gain. To design and simulate the proposed antenna, CST Microwave Studio software has been used in this project to get the desired result which is the return loss and gain. The design for this antenna is very simple to ease the fabrication process. Overall, the structure consists of an antenna patch with a rounded rectangular shape, tapered feed line, and a truncated ground plane with notches at both corners. The simulation result of reflection coefficient of the antenna is at 0.7 GHz up to 6.8 GHz which has a high bandwidth efficiency at 162%, and have a good gain which is in around 2 to 5.6 dB if compared to the previous study by [1], as the bandwidth efficiency was 109% and gain values varies between 1 to 3.83 dB only.
  • Publication
    Design of Quad-Band Bandpass Filter Using Dual-Mode SLRs and Coupled-Line for DCS/WLAN/WiMAX and 5G Applications
    ( 2022-05-01)
    Tantiviwat S.
    ;
    Siti Zuraidah Ibrahim
    ;
    Mohammad Shahrazel Razalli
    ;
    Soh Ping Jack
    A design of a microstrip quad-band BPF with flexibly controlled bandwidth is presented in this paper. Two dual-mode short-circuited SLRs with a common via-hole are proposed, which are utilized to obtain the first and second passband, while the third passband is generated by implementing the second-order half-wavelength coupled-line resonator. Another dual-mode open-circuited SLR can be operated at the fourth passband. The proposed quad-band BPF is centered at 1.80/2.45/3.50/4.90 GHz for DCS/WLAN/WiMAX and 5G applications. By appropriately choosing the lengths of the four sets of resonators, all passbands can be fully varied independently with minimal effect on other passbands. Moreover, the bandwidth of each passband can be flexibly controlled by tuning the coupling parameters. The dimension of the fabricated proposed filter is about 0.12 × 0.20 λg, indicating the compactness of the design, whereas the measurements are in good agreement with the simulated results. The measured S11 are at least 12 dB in the four pass-bands. The passbands S21 are approximately 0.65, 1.42, 0.78, and 1.20 dB, which exhibit low insertion loss at the passband frequency of the first, second, third, and fourth passband, respectively.
  • Publication
    Miniature triple-mode diplexer with good selectivity
    ( 2017-01-01)
    Sugchai Tantiviwat
    ;
    Siti Zuraidah Ibrahim
    ;
    Mohammad Shahrazel Razalli
    This paper presents a compact diplexer with high selectivity. The proposed diplexer employs two sets of triple-mode bandpass filters. Using this approach, the pair of even-mode resonant frequencies can be flexibly controlled by adjusting the characteristic impedance or electrical lengths of the two open-circuited stubs while the odd-mode resonant frequency remains at the fundamental resonant frequency. For a demonstration, a diplexer with two passbands centred at 1.50 and 1.70GHz and the transmission zeros are created close to the passband edges which extremely improve the skirt selectivity. As a result, the proposed diplexer occupies an extremely small area, i.e., approximately 0.30λg × 0.35λg. The measured results are in good agreement with the simulated predictions.
  • Publication
    IoT-based Door Access Using Three Security-Layers
    ( 2023-10-06)
    Aznan M.A.
    ;
    Siti Zuraidah Ibrahim
    ;
    Ku Nurul Fazira Ku Azir
    ;
    Ruzelita Ngadiran
    ;
    Mohd Noh F.H.
    This paper demonstrates an Internet-of-Things, IoT-based Door Access using three security layers, which are biometric identification, authentication, and authorized reply. The IoT-based door access is developed with Closed Circuit Television (CCTV) monitoring to control door access by authorized users using facial recognition technique and the Telegram application along with a database to record user logs. In the first security layer, the user’s face will be captured by CCTV camera and then processed to match to the registered face. In the authentication layer, the system will use Telegram Bot to send a message to the user registered Telegram Chat Identification (ID) only for entering the password. In the third security layer, if the password is valid, the system will send a signal to the hardware to unlock the door. The results showed that the developed prototype of this system successfully operated as expected.
  • Publication
    Performance and Stamina Wearable Devices and Monitoring System for Football Players
    ( 2023-10-06)
    Kamarudzaman M.F.
    ;
    Ku Nurul Fazira Ku Azir
    ;
    Siti Zuraidah Ibrahim
    ;
    Ujir H.
    Analysing and monitoring the performance of football players is not something new in the world of football. Having to analyse and monitor the player’s performance, the coaching staff and manager can see the player’s development and at the same time the training drills can be more effective. There are three main player’s attributes that coaching staff and manager need to monitor, which are speed, acceleration, and stamina. The system available today does not represent the player’s performance for each of the attributes in terms of values. This project is aiming to design and develop a system that can analyse and monitor the football player’s performance using micro-electronic technology (MEM) like accelerometer and gyroscope. There will be two microcontrollers that are responsible for controlling the interaction between other components and uploading the collated data into cloud storage. This project will use the ThingSpeak platform to generate the player’s development graph. This platform is available in the form of websites and smartphone applications. By implementing IoT into the system, the coaching staff and manager can monitor the player’s development anywhere at any time. The system is successfully read and analysed the player’s attributes performance for speed, acceleration, and stamina in form of values and graphs where at the same time the project is also capable of analysing the player’s penalty kick technique.
  • Publication
    Development of the Educational Tool for Optimized Algorithm Model Using MATLAB GUI
    ( 2021-01-01)
    Aunkaew S.
    ;
    Tantiviwat S.
    ;
    Siti Zuraidah Ibrahim
    Optimization algorithms are mathematical functions that are widely used to solve objective function problems through maximization or minimization. Typically, students at the beginner level face difficulties in understanding the complex mathematical solutions used in optimization algorithms. This paper presents an educational graphical user interface (GUI) for simulation of various topology optimization algorithms that users can use to explore the behavior of local search (LS), tabu search (TS) and particle swarm optimization (PSO) algorithms. The GUI is created using the MATLAB GUIDE tool, which acts as a front-end interface that can be used for teaching as well as learning. Benchmark functions such as the De Jong first function (DF), the Griewank function (GF), the Himmelblau function (HF) and the Periodic function (PF) were used to validate the investigated optimization algorithms. The developed GUI has features where the user can enter functions, define boundary limits, specify solver parameters and select the type of output display. The results of the instance HF function shown using the GUI optimization tool are in good agreement with the benchmark function.
  • Publication
    Compact multilayer wideband symmetric five-port reflectometer
    ( 2017-04-01)
    Samir Salem Al-Bawri
    ;
    Mohd Faizal Jamlos
    ;
    Siti Zuraidah Ibrahim
    ;
    Syed Alwee Aljunid Syed Junid
    This article presents a new design of a wideband, compact, and low-cost symmetric five-port reflectometer (5PR). The proposed 5PR features a wide operational bandwidth of 3240 MHz (about 162% centered at 2 GHz). Five-symmetric branch-lines consist of SCURVE, STEE, SLIN, and Term were designed and optimized to achieve an equivalent value of 78 dB for S11, S22, S33, S44, and S55 at center frequency of 2 GHz. Such consistent value between those S-parameters proven a perfect matching impedance are successfully obtained by proposed symmetric 5PR even own a bandwidth as high as 162%. Moreover, the simulated and measured results show the proposed 5PR has realized magnitude of ≈ 0 dB (S11), 0.5 (S12, S13, S14, S15, S21, S23 … S54) as well as phase relative error of 120° which in parallel to theoretical values. With all capabilities mentioned, the proposed 5PR is a promising candidate to be installed in a microwave imaging system for biomedical applications in the future. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:802–805, 2017.
  • Publication
    Target direction finding using port technique for short range radar based sensor
    ( 2017-01-03)
    Ghazali S.
    ;
    Nazuhusna Khalid
    ;
    Siti Zuraidah Ibrahim
    ;
    Tan G.
    This paper presents a target direction finding using six-port technique for short range radar based sensor. Direction finding of the target is determined by performing phase measurement of the incident wave at the receiver side. This technique is also known as Direction of Arrival (DOA) detection method. In this paper, the operation of target direction finding is performed and simulated using Keysight Advanced Design Studio (ADS) simulation tool. The six-port device is modelled in ADS using measured scattering parameters (S-parameters). To convert the received RF signal to baseband signal, RF power detector is also designed and simulated independently in ADS. The simulated results of each stage is discussed and presented in this paper.
  • Publication
    Directional and wideband antenna for ground penetrating radar (GPR) applications
    ( 2017-01-03)
    Nazuhusna Khalid
    ;
    Siti Zuraidah Ibrahim
    ;
    Mohd Nazri A. Karim
    This paper presents a directional and wideband antenna for ground penetrating radar (GPR) applications. The antenna is designed by introducing slots on bowtie patch. The design is implemented on FR4 board with dielectric constant of 4.7 and thickness of 0.8 mm. As a result of having thinner substrate, the design is compact and light weight. The bowtie antenna performance is investigated across 0.5 GHz to 3 GHz. The parametric study of the length and location of slot are also demonstrated in this paper to obtaining the best return loss across widest operational bandwidth. The both simulated and fabricated antenna bandwidth are more than 50% (fractional bandwidth). The additional reflector is included at the back of bowtie antenna in the simulation for obtaining directional radiation pattern and high gain. The comparison between simulated and measured reflection coefficient is also presented.