Browsing by Author "Xue, Jun Li"

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    Design of a Compact UWB/MIMO Antenna with High Isolation and Gain
    (IEEE, 2020) Jabire, Adamu Halilu; Adnan, Ghaffar; Xue, Jun Li; Abdu, Anas; Saminu, Sani; Sadiq, Abubakar Muhammad; Jajere, Adamu Muhammed
    The design of a compact two elements ultrawideband (UWB) multiple-input-multiple-output (MIMO) planar antenna is presented. It consists of two symmetrically circular patch antenna components. The overall size of the antenna is 30 × 60 × 1.6mm3 and is printed on the FR4 substrate. The proposed antenna exhibits UWB qualities from 2.6 – 12GHz with the isolation of less than 20dB. The total active reflection coefficient (TARC), the data rate that can be supported in a particular channel (CCL), and a factor that signifies higher pattern diversity are presented, which are useful for portable UWB applications.
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    Metamaterial Based Design of Compact UWB/MIMO Monopoles Antenna with Characteristic Mode Analysis
    (MDPI, 2021-02-08) Jabire, Adamu Halilu; Adnan, Ghaffar; Xue, Jun Li; Abdu, Anas; Saminu, Sani; Alibakhshikenari, Mohammad; Falcone, Francisco; Limiti, Ernesto
    In this article, a novel metamaterial inspired UWB/multiple-input-multiple-output (MIMO) antenna is presented. The proposed antenna consists of a circular metallic part which formed the patch and a partial ground plane. Metamaterial structure is loaded at the top side of the patches for bandwidth improvement and mutual coupling reduction. The proposed antenna provides UWB mode of operation from 2.6–12 GHz. The characteristic mode theory is applied to examine each physical mode of the antenna aperture and access its many physical parameters without exciting the antenna. Mode 2 was the dominant mode among the three modes used. Considering the almost inevitable presence of mutual coupling effects within compact multiport antennas, we developed an additional decoupling technique in the form of perturbed stubs, which leads to a mutual coupling reduction of less than 20 dB. Finally, different performance parameters of the system, such as envelope correlation coefficient (ECC), channel capacity loss (CCL), diversity gain, total active reflection coefficient (TARC), mean effective gain (MEG), surface current, and radiation pattern, are presented. A prototype antenna is fabricated and measured for validation.