Theory and Simulations of a Conformal Omni- Directional Subwavelength Metamaterial Leaky-Wave Antenna
Andrea Alù, Filiberto Bilotti, Nader Engheta, Fellow, Lucio Vegni,
IEEE Transactions on Antennas and Propagation
Volume: 55, Issue: 6, June 2007
Conformal antennas, cylindrical antennas, leakywaves, metamaterials
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 finiteness 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.
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