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Author: search.filters.author.Supreeyatitikul, NathapatSubject: search.filters.subject.Antenna array

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    Four-Element Wideband Circularly Polarized Sequentially-Rotated Slot Antenna Array for Small Spacecraft Technology
    (2023-01-01)
    Supreeyatitikul, Nathapat
    ;
    Lertwiriyaprapa, Titipong
    ;
    Phongcharoenpanich, Chuwong
    This research proposes four-element wideband circularly polarized (CP) sequentially-rotated slot antenna array. The proposed four-element CP sequentially-rotated slot antenna array consists of four-element C-shaped monopole patch on the upper-layer substrate and octagonal-shaped ring slot ground plane with sequentially-rotated feed network on the lower-layer substrate. The sequentially-rotated feed network is utilized to improve the-10-dB IBW and 3-dB ARBW. The results of the measured IBW and ARBW at 2.4 GHz are 90.41% (1.83-4 GHz) and 85% (1.96-4 GHz), respectively. The maximum gain at 3.3 GHz is 7.8 dBic with bi-directional CP radiation.
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    Metasurface-Based Wideband CP Antenna Array Using Hybrid Coupler for 5G Mid-band Applications
    (2023-01-01)
    Supreeyatitikul, Nathapat
    ;
    Lertwiriyaprapa, Titipong
    ;
    Phongcharoenpanich, Chuwong
    This paper proposes the lemon-shaped metasurface (MTS)-based wideband circularly polarized (CP) antenna array using hybrid coupler for mid-band wireless communications. The proposed MTS-based CP antenna array includes two-stack layers of FR-4 substrate: upper-stack and lower-stack substrates. The upper-stack substrate contains quadri clusters of 4 × 4 MTS cells. The lower-stack substrate consisted of four slots as the ground plane and hybrid couple as the feed network. Besides, the MTS elements and hybrid couple feed network function as polarization conversion. The proposed MTS-based CP antenna array for 5G mid-band spectrum (center frequency at 4 GHz) achieves simulated IBW of 41.25% (3.35-5 GHz) and ARBW of 21.25% (3.68-4.53 GHz). The simulated maximum gain at 3.9 GHz is 9.1 dBic. The radiation characteristic is right-hand circular polarization radiation.
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    Quadri-Cluster Broadband Circularly-Polarized Sequentially-Rotated Metasurface-Based Antenna Array for C-Band Satellite Communications
    (2021-01-01)
    Supreeyatitikul, Nathapat
    ;
    Torrungrueng, Danai
    ;
    Phongcharoenpanich, Chuwong
    This research proposes a compact quadri-cluster broadband circularly polarized (CP) sequentially-rotated metasurface-based (MTS) antenna array for the C-band frequency spectrum. One cluster of the quadri-cluster MTS-based antenna array consisted of 4 times 4 S-shaped periodically-arranged MTS elements. The sequentially-rotated feed network was utilized to realize circular polarization and improve the impedance bandwidth (IBW), 3-dB axial ratio bandwidth (ARBW) and 3-dB boresight gain bandwidth of the quadri-cluster MTS-based antenna array. Simulations were performed and results were compared with experiments. The measured IBW and ARBW were 84.74% (4.0-9.0 GHz) and 57.6% (4.2-7.6 GHz) at the center frequency of 5.9 GHz, rendering the proposed quadri-cluster MTS-based antenna array suitable for satellite communication applications. In addition, the quadri-cluster MTS-based antenna array achieved the measured 3-dB boresight gain bandwidth of 81.3% (3.9-8.7 GHz), the maximum gain of 10.04 dBic at 5.6 GHz, and low radar cross-section. Specifically, the novelty of this research lies in the use of the sequentially-rotated feed network with the S-shaped MTS elements to effectively enhance ARBW of the quadri-cluster MTS-based antenna array for the C-band frequency spectrum.