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Creators/Authors contains: "Abdelshafy, A."

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  1. ; ; ; ; ; (, 2019 Thirteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials))
    We present the novel concept of exceptional points of degeneracy (EPDs), which denote a coalescence of multiple eigenmodes, that directly emerge in systems when a linear time-periodic (LTP) variation is applied. Though the presented theory is general, as an example we establish the general conditions that yield an EPD in a single LTP LC resonator with a capacitance that varies periodically in time. We show a potential application of the proposed LTP system in making sensors to exploit the ultra-sensitivity associated with operating at an EPD. 
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  2. ; ; ; ; ; (, 2019 13th European Conference on Antennas and Propagation (EuCAP), Krakow, Poland, 31 March-5 April 2019.)
    A degenerate band edge is a resonant dispersive behavior of coupled transmission lines arising from a fourth-order degeneracy due to the coalescence of two propagating and two evanescent modes. It leads to a so-called giant resonance resulting in field enhancement inside the transmission line. In this paper, we propose a SIW periodic line supporting a degenerate band edge and we study the impact of losses. Conductor and dielectric losses are analyzed in the full-wave simulations of the unit cell and of truncated structures. 
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    Accepted Manuscript Full Text Available