Browsing by Author "Usman, A. D"

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    A feasibility study of cluster-based energy harvesting aware routing protocol for body nanosensor network
    (IEEE Computer Society Nigeria Section, 2020-08-25) Zakariyya, O . S; Yaro, A. S; Usman, A. D; Tekanyi, A. M. S; Sani, S. M
    Wireless nanosensor network (WNSN) are networks of interconnected nano-nodes communicating at terahertz frequency. The nano-node range of communication as well as the overall performance of the WNSN is affected mainly by the path loss of the terahertz frequency band and also by the very limited nano-nodes resources and capacity. For that reason, there is need for a suitable routing protocol that will guarantee multihop communication in WNSN. Clustering technique has been proving to be a cost-effective method to provide successful communication for body WNSNs. However, the nanonode elected as the nano-cluster head diminishes its energy dynamically. This will result into loss of monitored data in the cluster and reduce the reliability of the network. Existing clustering techniques in WNSN proposed for health care application did not take the energy exhaustion of the nano-cluster head into consideration. Hence, this work gives a review of work done to date on WNSN routing protocol, identifies their weaknesses and then suggest the implementation of an energy harvesting aware protocol that employs cluster-based hierarchical architecture by considering two different scenarios (using a back-up cluster head technique and using a wireless energy transfer technique) with a view to ensuring lifetime operation of the nano-node, minimize packet loss and conserving energy.
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    MODELLING AND REALIZATION OF A COMPACT CPW TRANSMISSION LINE USING 3D MMICS TECHNOLOGY IN ADS MOMENTUM
    (published by IEEE Xplore, 2019-12-12) Bello, H; Oyeleke, O; Usman, A. D; Bello, T; Mohammad, I; Zakariyya, O. S
    The two dimensional monolithic microwave integrated circuits (2D MMIC) are mainly implemented in a planar fashion and use microstrip design based technology. At microwave frequency and above, they would require a large amount of passive circuitry therefore occupying a great deal of space (area). Furthermore the 2D MMIC is associated with some disadvantages ranging from the use of very thin substrate which makes it less reliable, to very delicate substrate due to the use of via-hole technology, coupling issue and high cost due to large area it occupies. To solve these problems a three-dimensional multilayer technique 3D MMIC was used. The design of the 3D MMIC is based on coplanar waveguide (CPW), in this design the signal is protected by the two grounds on both side, the circuit becomes more compact, cost-effective and with improved performance. This research work was aimed at the design, modelling and investigation of a GaAs based multilayer compact 3D MMIC transmission line. Different transmission lines were designed and modelled using Agilent’s Advanced Design System (ADS) and their Sparameters were extracted using Electromagnetic (EM) simulator momentum