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Subject: search.filters.subject.Antenna arrays

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    CMA-Based Quadruple-Cluster Leaf-Shaped Metasurface-Based Wideband Circularly-Polarized Stacked-Patch Antenna Array for Sub-6 GHz 5G Applications
    (2023-01-01)
    Supreeyatitikul, Nathapat
    ;
    Janpangngern, Pisit
    ;
    Lertwiriyaprapa, Titipong
    ;
    Krairiksh, Monai
    ;
    Phongcharoenpanich, Chuwong
    This research proposes a quadruple-cluster leaf-shaped metasurface (MTS)-based circularly-polarized (CP) stacked-patch antenna array with hybrid coupler feed network for sub-6 GHz 5G applications. In the study, the leaf-shaped MTS-based CP stacked-patch antenna is characterized by characteristic mode analysis (CMA). In the antenna design, one cluster of the quadruple-cluster leaf-shaped MTS-based antenna array consists of 4×4 leaf-shaped MTS elements; and the hybrid coupler feed network is used to enhance impedance bandwidth (IBW), axial ratio bandwidth (ARBW), and antenna gain. Simulations are carried out and an antenna prototype is fabricated and experiments undertaken. The measured IBW, ARBW, and maximum gain at the center frequency (4 GHz) are 62.5% (3.4- 5.9 GHz), 21% (3.8- 4.54 GHz), and 9.04 dBic at 3.9 GHz. The novelty of this research lies in the use of: (i) the CMA concept to design and develop the leaf-shaped wideband MTS-based stacked-patch antenna with CP radiation pattern; and (ii) a low-complexity hybrid coupler feed network to enhance the IBW, ARBW and gain.
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    CMA-Based Four-Element Broadband Circularly Polarized Octagonal-Ring Slot Antenna Array for S-Band Satellite Applications
    (2022-01-01)
    Supreeyatitikul, Nathapat
    ;
    Lertwiriyaprapa, Titipong
    ;
    Krairiksh, Monai
    ;
    Phongcharoenpanich, Chuwong
    This research proposes a low-complexity and low-profile four-element circularly polarized (CP) octagonal-ring slot antenna array with sequentially-rotated feed network for S-band satellite applications. The proposed antenna array is characterized by characteristic mode analysis (CMA). One single element of the CP octagonal-ring slot antenna array consists of a C-shaped monopole on the upper layer functioning as the radiating patch; and an octagonal-ring slot patch on the lower layer functioning as the ground plane. The four elements are connected by a sequentially-rotated feed network to enhance the impedance bandwidth (IBW), axial ratio bandwidth (ARBW), and gain. Simulations are performed, and an antenna prototype is fabricated and experiments carried out. The measured IBW and ARBW at the center frequency of 2.4 GHz are 91.6% (1.8 - 4 GHz) and 84.5% (1.97 - 4 GHz), with the maximum gain of 7.8 dBic at 3.3 GHz, rendering the proposed four-element CP octagonal-ring slot antenna array with sequentially-rotated feed network operationally suitable for S-band satellite communication. The novelty of this research lies in the use of CMA to characterize the circular polarization of the octagonal-ring slot antenna array; and the sequentially-rotated feed network to enhance the IBW, ARBW, and antenna gain of the four-element CP octagonal-ring slot antenna array with sequentially-rotated feed network.
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    Characteristics of monopole Yagi array antenna on the ground plane with direction of arrival estimation
    (2003-01-01)
    Phongcharoenpanich, C.
    ;
    Buranakunaporn, C.
    ;
    Kosulvit, S.
    In this paper, direction-of-arrival (DOA) estimation of monopole Yagi array antenna on the ground plane for mobile system is proposed. Spatial smoothing technique and unitary ESPRIT are considered to find the direction of signal under uncorrelated and correlated signal conditions, respectively. The configuration of the estimated antenna is also proposed to reduce the co-channel interference at the base station when compared with conventionally omnidirectional antenna. In addition, DOA estimation with this antenna can be increased the performance and capacity in mobile system.