Browsing by Author "Salama, R"

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    Design of a multi-zone dielectric fresnel lens for microwave wireless power transfer in concrete structures
    (Institute of Electrical and Electronics Engineers, Inc., 2018-09) Salama, R; Liyanapathirana, R; Samarasinghe, R; Abeygunawardana, S
    Wireless power transfer (WPT) can be used for a number of applications in civil engineering such as powering of embedded sensors in concrete. In this paper, a multi-zone dielectric lens is designed and used to enhance the performance of WPT in concrete structures. Analytical equations are used to calculate the design parameters of the dielectric lens andperformance pertaining to the transmission coefficient, S21, and electric field distribution of the WPT with and without the dielectric lens is investigated using computational models. It is shown that by using a dielectric lens, the performance of WPT in concrete structures can be significantly enhanced. It is also shown that by using the dielectric lens, the external power source can be placed at a distance of 1200 mm from the concrete structure and achieve an S21 that is similar to that achieved by the WPT without the dielectric lens when the external power source is placed at a distance of 200 mm.
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    Wireless power transmission in concrete using cylindrical dielectric resonator antennas
    (Institute of Electrical and Electronics Engineers, Inc., 2018-09) Sabrin, S; Salama, R; Liyanapathirana, R; Samarasinghe, R; Abeygunawardana, S
    This paper investigates the capability of wireless power transmission (WPT) in a concrete medium using Cylindrical Dielectric Resonator Antennas (CDRAs). Two dualband (2.4 GHz and 5.7 GHz) CDRAs were modelled; one CDRA was embedded in concrete and another CDRA was placed externally outside the concrete medium. The recorded magnitude of transmission coefficient from the external to the embedded CDRA is of relatively high value and demonstrates the capability of the CDRAs to be used for WPT in concrete. Furthermore, a sensitivity analysis on the effect of variations of the relative dielectric constant and loss tangent tan δ of concrete on the magnitude of the reflection coefficient, S22, and frequency of the embedded CDRA was performed. This analysis showed that a reliable WPT could be achieved with cylindrical dielectric resonator antennas at 2.4 GHz and 5.7 GHz.