volume | PIER Journals

Abstract

We deploy the general momentum space theory developed in Part I in order to explore nonlocal radiating systems utilizing isotropic spatially-dispersive metamaterials. The frequency-dependent angular radiation power density is derived for both transverse and longitudinal external sources, providing detailed expressions for some special but important cases like time-harmonic- and rectangular-pulse-excited small dipoles embedded into such isotropic metamaterial domains. The fundamental properties of dispersion and radiation functions for some of these domains are developed in examples illustrating the features in nonlocal radiation phenomena, including differences in bandwidth and directivity performance, novel virtual array effects, and others. In particular, we show that by a proper combination of transverse and longitudinal modes, it is possible to attain perfect isotropic radiators in domains excited by small sinusoidal dipoles. The directivity of a nonlocal small antenna is also shown to increase by possibly four times its value in conventional local domains if certain design conditions are met.

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doi:10.2528/PIERB20043010

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19. Mikki, S. and Y. Antar, "On electromagnetic radiation in nonlocal environments: Steps toward a theory of near field engineering," 2015 9th European Conference on Antennas and Propagation (EuCAP), 1-5, April 2015.

20. Mikki, S. and Y. Antar, New Foundations for Applied Electromagnetics: The Spatial Structure of Fields, Artech House, 2016.

21. Mikki, S., "Exact derivation of the radiation law of antennas embedded into generic nonlocal metamaterials: A momentum-space approach," 2020 14th European Conference on Antennas and Propagation (EuCAP), 1-5, 2020.

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Prof. Said Mikki