A Broadband Ultrathin Nonlinear Switching Metamaterial

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E. Zarnousheh Farahani S. Jarchi A. Keshtkar

Abstract

In this paper, an ultrathin planar nonlinear metamaterial slab is designed and simulated. Nonlinearity is provided through placing diodes in each metamaterial unit cell. The diodes are auto-biased and activated by an incident wave. The proposed structure represents a broadband switching property between two transmission and reflection states depending on the intensity of the incident wave. High permittivity values are presented creating a near zero effective impedance at low power states, around the second resonant mode of the structure unit cell; as the result, the incident wave is reflected. Increasing the incident power to the level which can activate the loaded diodes in the structure results in elimination of the resonance and consequently a drop in the permittivity values near the permeability one as well as a switch to the transmission state. A full wave as well as a nonlinear simulations are performed. An optimization method based on weed colonization is applied to the unit cell of the metamaterial slab to achieve the maximum switching bandwidth. The structure represents a 24% switching bandwidth of a 10 dB reduction in the reflection coefficient.

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How to Cite
ZARNOUSHEH FARAHANI, E.; JARCHI, S.; KESHTKAR, A.. A Broadband Ultrathin Nonlinear Switching Metamaterial. Advanced Electromagnetics, [S.l.], v. 6, n. 2, p. 64-70, may 2017. ISSN 2119-0275. Available at: <http://aemjournal.org/index.php/AEM/article/view/480>. Date accessed: 20 aug. 2017. doi: http://dx.doi.org/10.7716/aem.v6i2.480.
Keywords
metamaterial; nonlinear metamaterial, planar metamaterial; switching; reflection; transmission
Section
Articles