Browsing by Author "Sadiq, Abubakar Muhammad"

Now showing 1 - 6 of 6
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    CHARACTERISTIC MODE ANALYSIS OF A STEPPED GRADIENT PLANAR ANTENNA FOR UWB APPLICATION
    (Department of Electrical Engineering, Ahmadu Bello University, Zaria, 2020-03) Jabire, Adamu Halilu; Saminu, Sani; Abdu, Anas; abel, Noku Amos; Sadiq, Abubakar Muhammad
    Characteristic mode technique is employed to gain a physical insight and also to find out the dominant mode of stepped gradient planar antenna without considering the feeding port. The rational of the model further implies that we can consider antenna's shape and feed design as independent steps. The stepped gradient planar antenna is constructed and measured, in which both the measured and simulated agreed on each other in terms of reflection coefficient and voltage standing wave ratio. The miniature stepped gradient planar antenna is appropriate for numerous applications in ultra-wideband (UWB) communication systems from 2.7 to 12GHz and stable radiation pattern at both E and Hfields were attained over the operating frequency band which is suitable for use in UWB systems.
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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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    Isolation Frequency Switchable MIMO Antenna for PCS, WIMAX and WLAN Application
    (Universiti Teknologi Malaysia (UTM), 2019-12-18) Jabire, Adamu Halilu; Abdu, Anas; Saminu, Sani; Sadiq, Abubakar Muhammad; Jajere, Adamu Muhammed
    In this study, a lumped component based frequency reconfigurable multiple-input-multiple-output (MIMO) receiving wire design is presented. The proposed antenna is composed of a planar structure in form of F-shaped together with a slotted and defected ground structure for bandwidth and isolation enhancement. The MIMO antenna operates in six frequencies upon the state of the four lumped element switches. The proposed receiving wire design exhibits a multiband frequency reconfigurable characteristics from 1-7GHz with isolation of more than 14dB for the whole band, with efficiency of about 75%. The MIMO antenna’s behavior in terms of ratio of square root of the sum of power reflected wave to the incident wave (TARC), ECC and CCL are all within the acceptable limits. The design is suitable for personal communication system (PCS), WIMAX and WLAN wireless 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.
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    OSTBC-MIMO Performance Evaluation Using Different Modulation Schemes
    (Faculty of Technology Education, Abubakar Tafawa Balewa University Bauchi, 2020-09) Saminu, Sani; Jabire, Adamu Halilu; Jajere, Adamu Muhammed; Sadiq, Abubakar Muhammad; Zakariyya, Rabiu Sale
    This paper presents the performance evaluation of Orthogonal Space Time Block Codes on Multiple Input Multiple Output (OSTBC-MIMO) system using our proposed extended Alamouti’s STBC scheme based on Orthogonal design. The model was evaluated with different modulation schemes such as BPSK, QPSK, 8-PSK, and 16-PSK for different antenna configurations. From our results, BPSK outperforms other modulations scheme. The system model was developed in Matlab environment and Bit error rate against signal to noise ratio was used to evaluate the performance under Rayleigh faded channel. Our proposed scheme improves the channel capacity gains, data throughput, and mitigate fading and interference.
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    Reduction of Mutual Coupling in UWB/MIMO Antenna Using Stub Loading Technique
    (Sciendo, 2021) Jabire, Adamu Halilu; Abdu, Anas; Saminu, Sani; Sadiq, Abubakar Muhammad; Jajere, Adamu Muhammed; Ahmed, Yusuf Kola
    The research presents mutual coupling reduction between UWB-MIMO antenna elements using stub loading technique. The proposed 2 × 2 UWB antenna geometry consists of two circular-shaped monopole radiators with a partial ground for perfect impedance matching. Stubs of 20 mm × 0.2 mm are inserted between the two antenna elements in the ground plane to improve the isolation. The decoupling stub leads to a mutual coupling reduction of less than 20 dB. The farfield measurement at a selected frequency of 10 GHz confirms an omnidirectional radiation pattern. Different MIMO antenna metric such as channel capacity loss (CCL), mean effective gain (MEG), total active reflection coefficient (TARC), envelope correlation coefficient (ECC), and surface current are presented. Details of the design considerations and the simulation and measurement results are presented and discussed. The proposed MIMO antenna array can be well suited for UWB applications.