Browsing by Author "Abdullahi, Aminu Gambo"

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    Circuit Modeling of Dual Band MIMO Diversity Antenna for LTE and X-Band Applications
    (Universitas Ahmad Dahlan, 2023-09) Abdullahi, Aminu Gambo; Kolawale, S. F.; Saminu, Sani; Danladi, Ali; Jabire, Adamu Halilu
    This paper presents a study on developing a dual-band antenna equivalent circuit model for X-Band and LTE applications. MIMO antennas play a crucial role in modern wireless communication systems, and understanding their impedance behavior is essential. This work proposes a dual-band lumped equivalent circuit model, utilizing gradient optimization based on antenna-simulated S-parameters in Advanced Design System (ADS). The four radiating elements of the MIMO antenna are accurately modeled, considering their geometry and the defected ground structure (DGS) effect, which enhances the antenna's isolation and low correlation coefficient (ECC). The calculated lumped equivalent circuit model is validated through rigorous simulation and measurement data, demonstrating consistency with the expected results. The experimental measurements show measured isolation exceeding 20 dB while achieving a maximum realized gain of 5.9 dBi and an efficiency of 87%. The developed model holds promise for improving the design and performance of MIMO antennas for various applications.
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    Mutual Coupling Reduction For Triple Band MIMO Antenna Using Stub Loading Technique
    (faculty of Natural and Applied Sciences, Sule Lamido University, Kafin Hausa, Jigawa State, Nigeria, 2021-01) Jabire, Adamu Halilu; Abdullahi, Aminu Gambo; Saminu, Sani; Jajere, Adamu Muhammed; Sadiq, Abubakar Muhammad
    This paper presents a mutual coupling reduction using stub and partial ground structure. The driven analysis comprises four antennas that are placed orthogonal to each other. A decoupling network is proposed, which consists of one long stub extended between the four defected ground structure for electromagnetic interaction reduction. The proposed antenna has triple-band frequencies at 3 GHz, 5.5 GHz, and 7.1 GHz. The performance of the four by four antenna arrays is evaluated based on envelope correlation coefficient, isolation, mean effective gain, channel capacity loss, total active reflection coefficient, and diversity gain. The results strongly support the applicability of fifth-generation sub 6 GHz applications.