Tuntrakool, Sunti

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Tuntrakool, Sunti
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Tuntrakool, S.
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Email
sunti.tu@kmitl.ac.th

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    Dual-Band Reflective Metasurfaces for 5G mmWave Applications: Design, Analysis, and Waveguide Validations
    (2026-01-01)
    Mohammed, Sunusi Garba
    ;
    Samsuri, Noor Asmawati Binti
    ;
    Rahim, Mohamad Kamal B.A.
    ;
    Ripin, Nabilah Binti
    ;
    Taufiqqurrachman
    This paper presents a dual-band reflective metasurface unit cell for millimeter-wave RIS applications operating at 26 GHz and 28 GHz, covering the 5G n258 and n257 bands. The proposed design features a hybrid resonator structure to achieve a consistent phase trend and strong reflection performance across the 5G mmWave frequency band. To ensure stable dual-band performance of the unit cell, parametric optimization is conducted. The unit cell is investigated through Floquet simulations and WR-34 rectangular -to-square waveguide-transition-based full-wave simulations, followed by experimental validation using a fabricated WR-34 rectangular-to-square waveguide transition. The simulated resonances at 26 GHz and 28 GHz are experimentally observed at 26.7 GHz and 28.9 GHz, respectively, indicating minor frequency deviations. Measured results demonstrate reflection magnitudes of -1.80 dB at 26.7 GHz and -0.80 dB at 28.9 GHz, with corresponding phase responses of - 68° and -13°, and bandwidths of 5.12% and 6.07%, respectively.
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    Geometry-Driven Performance of Unit Cells in Multiband Reflective Metasurfaces: A Comparative Study
    (2025-01-01)
    Taufiqqurrachman
    ;
    Rahim, Mohamad Kamal B.A.
    ;
    Samsuri, Noor Asmawati Binti
    ;
    Wijayanto, Yusuf Nur
    ;
    Yaziz, Nur Syahirah Mohd
    A multiband reflective metasurface can be designed using a multi-ring resonator, where the resonator can take various shapes such as circular, square, hexagonal, triangular, and others. This paper presents a comparative study of unit-cell multiband reflective metasurfaces based on their geometric structure, focusing on reflection magnitude, reflection phase, and bandwidth performance of hexagonal and triangular shapes. Both proposed designs are designed and simulated at X-band frequencies using an F4BMX220 substrate with a thickness of 1.5 mm. Simulation results show that the hexagonal shape offers better reflection performance and a wider bandwidth compared to the triangular shape.
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    Multiband Reflective Metasurface at X-Band Frequency Using Multi-Square Ring Resonators (SRRs)
    (2025-01-01)
    Taufiqqurrachman
    ;
    Rahim, Mohamad Kamal B.A.
    ;
    Asmawati Binti Samsuri, Noor
    ;
    Wijayanto, Yusuf Nur
    ;
    Syahirah Mohd Yaziz, Nur
    A multiband reflective metasurface has been designed using a multi-Square Ring Resonator (SRR) operating at X-band frequencies. Each SRR is designed to resonate at 8, 10, and 12 GHz, respectively. Based on the simulated results, the reflection values are -0.4 dB at 8 GHz, -1.86 dB at 10 GHz, and -1.99 dB at 12 GHz, while the reflection phases are -1.06° at 8 GHz, -9.8° at 10 GHz, and -1.98° at 12 GHz. Overall, all resonance frequencies exhibit more than 60% reflected power, with bandwidths of 0.67 GHz at 8 GHz and 0.2 GHz at 10 and 12 GHz.
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    Comparison between Snowflake Fractal and Koch Fractal for Intelligent Reflecting Surface
    (2025-01-01)
    Yaziz, Nur Syahirah Mohd
    ;
    Rahim, Mohamad Kamal A.
    ;
    Samsuri, Noor Asmawati
    ;
    Zubir, Farid
    ;
    Tuntrakool, Sunti
    This paper compares two fractal metasurface designs for Intelligent Reflecting Surfaces at X-band which is with a snowflake-shaped fractal ring and a fractal Koch metasurface. The snowflake ring design with a 10GHz center frequency achieves very high reflectance (~90%) at resonance and a bandwidth of about 1.90 GHz. The Koch-fractal design response with a bandwidth of 2.10 GHz at a center frequency of 10GHz. The method for both fractal metasurfaces and a comparable on their reflection coefficients, phase behaviour, bandwidth and current distributions are discussed in section II and section III.