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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  • Publication
    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.
      1
  • Publication
    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.
      1