Department of Electronics and Telecommunications Engineering

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https://repository.udsm.ac.tz/handle/123456789/40

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Browsing Department of Electronics and Telecommunications Engineering by Subject "Antenna"

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    Multi-band Circular Patch Antenna for Wideband Application
    (2013-08) Aabidi, Ebrahim S.; Kamarudin, M. R.; Rahman, T. A.; Iddi, Hashim U.
    This paper presents a multi-band circular patch antenna for wideband applications. The antenna operates at 1.5, 2.8, 4.0, 4.8, 7.5 and 8.8 GHz frequency bands. The antenna has been designed, simulated and fabricated on an FR4 substrate with dielectric constant ("r) of 4.4 and thickness of 1.6 mm. A dual feed approach has been used in the design of the proposed wideband antenna. The multi-band circular patch antenna is smaller than the conventional antenna for wideband application. The ¯nal optimized design is 50 £ 50mm2. The measured and simulated return loss results and simulated radiation pattern results of proposed antenna has been presented. The dual feed improves the gain of the proposed antenna. The measured and simulated results show that the proposed antenna provides good performance in term of return loss and radiation pattern for wideband applications.
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    Novel Dual-Band B-Shaped Printed Monopole Antenna for MIMO Application
    (2013) Iddi, Hashim U.; Kamarudin, Muhammad R.; Rahman, Tharek A.; Jamlos, M. F.; Aghda, Majid R.
    Proposed antenna consists of B-shaped element which operates at dual-band frequencies (2.45 and 5.8 GHz). The antenna has been simulated using CST software and the prototype has been fabricated on FR4 substrate. The impedance bandwidths (BWs) that have been achieved are 29.9% and 33.8% for 2.45GHz and 5.8GHz bands respectively. The mutual coupling and correlation coefficient have also been investigated in which the antenna provides -22dB of mutual coupling and 0.02 of correlation coefficient. The proposed design achieves low mutual coupling and correlation coefficient at a separation distance of λ 12 between antenna arrays. There is good agreement between the measurement and simulation results in terms of return loss and radiation pattern.
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    Optimization of Radial Line Slots Array Antenna Design for Satellite Communications
    (IEEE, 2013) Iliya, S. Z.; Rahman, T. A.; Iddi, Hashim U.; Purnamirza, T.; Orakwue, S. I.; Elijah, O.
    This paper presents a numerical method of identifying the beam squinting optimal design parameters. It is aimed at eradicating the arbitrary method of selection of phi, (φ) thetaT(θT) and phiT(φT) which improves the overall production process. Arbitrary selection of design parameters for beam squinting method which has been identified to solve the inherent return loss problems associated with the linearly polarized radial line slots array (LP-RLSA) design is time wasting and slows satellite design and manufacturing process. Results from the numerical solutions are computed using CST microwave studio (CST 2010); an antenna design software. Simulation results were compared with those obtained from literatures and it showed excellent agreement).