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    Broadband unidirectional twin-element MIMO antenna scheme for mid-band 5G and WLAN laptops
    (2024-12-01)
    Luadang, Bancha
    ;
    Janpangngern, Pisit
    ;
    Pookkapund, Khanet
    ;
    Dentri, Sitthichai
    ;
    Krairiksh, Monai
    This research proposes a broadband unidirectional twin-element multiple-input-multiple-output (MIMO) antenna scheme for mid-band 5G and WLAN applications. The twin-element antenna scheme comprises two single-element antennas, and each single-element antenna consists of a T-shaped hemispherical feeding patch, left- and right-arm radiating patches, and a conjoined triangular ground plane. The twin-element MIMO antenna scheme is integrated with a laptop model functioning as the reflector. The measured impedance bandwidth (|S<inf>11</inf>|, |S<inf>22</inf>|≤ − 6 dB) are 55.32%, covering 3.4–6.0 GHz, and the measured mutual coupling (|S<inf>12</inf>|) is less than − 15 dB. The measured gain at the center frequency (4.5 GHz) is 4.585 dBi. Besides, the measured xz- and yz-plane cross-polarization levels are below − 25 dB and − 15 dB, respectively. The half-power beamwidth (HPBW) in the xz-plane at 3.5, 4.5, and 5.5 GHz are 99°, 92.8°, and 84.2°, and the corresponding HPBW in the yz-plane are 102°, 78°, and 102°. The measured xz- and yz-plane back lobe levels are below − 15 dB across the entire operating frequency band (3.5–5.5 GHz). The radiation pattern of the twin-element MIMO antenna scheme is of unidirectionality. Furthermore, the envelope correlation coefficient and diversity gain of the twin-element antenna scheme are < 0.001 and > 9.99 dB, respectively. The proposed broadband unidirectional twin-element MIMO antenna scheme is thus operationally suitable for mid-band 5G/WLAN communication systems. Essentially, this research is the first to propose a broadband twin-element MIMO antenna scheme for mid-band 5G/WLAN applications.
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    Design of Wideband Circular Patch with Symmetric Strips Antenna for 5G Applications
    (2021-03-10)
    Srisukhot, Supada
    ;
    Thanamalapong, Wutthipong
    ;
    Phongcharoenpanich, Chuwong
    ;
    Lamultree, Suthasinee
    In this research, a circular patch antenna encircled by wide-circular-slot incorporated with symmetric strips is designed to operate over the middle-band of 5G applications. This proposed antenna is constructed of a copper and glazed on FR4 substrate with ?r of 4.3 and height of 1.6 mm. It is fed by a 50-ohms coplanar waveguide, which printed on a same side of the radiating circular patch. Obviously, it exhibits a bidirectional pattern with 10 dB return loss, minimum and maximum gains of 1.76 dBi, and 5.64 dBi, respectively covered 2-6 GHz. All appropriated parameters have been carried out by using an electromagnetic simulation tool. To evaluate its suitability in 5G applications, numerical results will be investigated and analyzed.