Siti Zuraidah Ibrahim
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Preferred name
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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Design of 4-Channel Multiplexer Using Waveguide Cylindrical Cavity Resonator

2023-01-01 , Siti Zuraidah Ibrahim , Ng G.S. , Soeung S. , Cheab S. , Masrakin K. , Tantiviwat S.

The design of a 4-channel multiplexer using a waveguide cylindrical cavity resonator of second order and fourth order is presented in this paper. The performance of the multiplexer is improved when implementing the higher order. The proposed multiplexer design is based on a manifold structure that uses a TE011 mode resonator as the filter channel element. The design procedure involves the use of FD3D and FEST 3D of CST Microwave Studio software to optimize the dimensions of the resonator and waveguide sections to achieve the desired performance parameters, such as insertion loss, return loss, and isolation. The simulated results show that the proposed multiplexer design achieves good performance by featuring the insertion loss is less than 1 dB, and the return loss is better than 10 dB over the 10 GHz band. The isolation between the channels is more than 10 dB, which is suitable for most applications. The proposed multiplexer design is simple, compact, and has good performance characteristics, making it suitable for use in various microwave applications.

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The Analysis of Reflectometer Configurations Based on Six-Port Technique

2023-10-06 , Masrakin K. , Siti Zuraidah Ibrahim , Hasliza A Rahim @ Samsuddin , Dewani A.A.

This paper presents the analysis of reflectometer (SPR) performance employing three different six-port configurations constructed and simulated in Agilent Advanced Design Software (ADS). The complex reflection coefficients given by three configurations of six-port reflectometer are determined by mathematical expression of the six-port scattering parameters. To verify the accuracy of the simulated reflection coefficient value, all the six-port configurations are formed by interconnection between 3dB power dividers and 3dB couplers which are readily available in ADS software. The performance of reflectometer is also validated by connecting 50 ohm Match Load, Short and Open Termination as Device Under Test (DUT). The value of the simulated reflection coefficient for all configurations shows closer to the theoretical value however, further calibration algorithm can be applied in the future for better accuracy.

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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.

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Microstrip Sensor Based on Ring Resonator Coupled with Double Square Split Ring Resonator for Solid Material Permittivity Characterization

2023-04-01 , Masrakin K. , Siti Zuraidah Ibrahim , Hasliza A Rahim @ Samsuddin , Saidatul Norlyana Azemi , Soh P.J. , Tantiviwat S.

This paper analyzes a microwave resonator sensor based on a square split-ring resonator operating at 5.122 GHz for permittivity characterization of a material under test (MUT). A single-ring square resonator edge (S-SRR) is coupled with several double-split square ring resonators to form the structure (D-SRR). The function of the S-SRR is to generate a resonant at the center frequency, whereas D-SRRs function as sensors, with their resonant frequency being very sensitive to changes in the MUT’s permittivity. In a traditional S-SRR, a gap emerges between the ring and the feed line to improve the Q-factor, but the loss increases as a result of the mismatched coupling of the feed lines. To provide adequate matching, the microstrip feed line is directly connected to the single-ring resonator in this article. The S-SRR’s operation switches from passband to stopband by generating edge coupling with dual D-SRRs located vertically on both sides of the S-SRR. The proposed sensor was designed, fabricated, and tested to effectively identify the dielectric properties of three MUTs (Taconic-TLY5, Rogers 4003C, and FR4) by measuring the microwave sensor’s resonant frequency. When the MUT is applied to the structure, the measured findings indicate a change in resonance frequency. The primary constraint of the sensor is that it can only be modeled for materials with a permittivity ranging from 1.0 to 5.0. The proposed sensors’ acceptable performance was achieved through simulation and measurement in this paper. Although the simulated and measured resonance frequencies have shifted, mathematical models have been developed to minimize the difference and obtain greater accuracy with a sensitivity of 3.27. Hence, resonance sensors offer a mechanism for characterizing the dielectric characteristics of varied permittivity of solid materials.

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