The detailed theory of a single subwavelength conformal radiator that exploits the resonant properties of thin cylindrical metamaterial shells supporting leaky waves is presented. It is shown and reviewed analytically and numerically how a circularly symmetric resonant leaky mode may be supported by a properly designed subwavelength homogenous cylindrical shell of low negative permittivity. Some physical insights are provided and numerical simulations with a feed point, considering also the finite-ness of the antenna in the longitudinal direction, are presented and discussed. Moreover, possibilities and limitations of a practical realization of this setup are mentioned, considering in details the possible anisotropies in the metamaterials.
Alù, A., Bilotti, F., Engheta, N., Vegni, L. (2007). Theory and simulations of a conformal omni-directional subwavelength metamaterial leaky-wave antenna. IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 55, 1698-1708 [10.1109/TAP.2007.898615].