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Theory And Simulations Of A Conformal Omni-Directional Sub-Wavelength Metamaterial Leaky-Wave Antenna, Andrea Alù, Filiberto Bilotti, Nader Engheta, Lucio Vegni
Theory And Simulations Of A Conformal Omni-Directional Sub-Wavelength Metamaterial Leaky-Wave Antenna, Andrea Alù, Filiberto Bilotti, Nader Engheta, Lucio Vegni
Nader Engheta
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 …
Subwavelength, Compact, Resonant Patch Antennas Loaded With Metamaterials, Andrea Alù, Filiberto Bilotti, Nader Engheta, Lucio Vegni
Subwavelength, Compact, Resonant Patch Antennas Loaded With Metamaterials, Andrea Alù, Filiberto Bilotti, Nader Engheta, Lucio Vegni
Nader Engheta
We analyze the matching and radiation properties of subwavelength resonant patch antennas filled with double-negative, double-positive, and/or single-negative metamaterial blocks. Analyzing the theoretical limits inherently present when loading such common radiators with metamaterials, we show how these configurations may exhibit in principle an arbitrarily low resonant frequency for a fixed dimension, but they may not necessarily radiate efficiently when their size is electrically small. However, interesting possibilities are suggested to overcome these limitations by employing circular or more complex patch geometries in order to select specific modes that, when appropriate loading ratios between the filling materials are chosen, also ensure …
Theory And Simulations Of A Conformal Omni-Directional Sub-Wavelength Metamaterial Leaky-Wave Antenna, Andrea Alù, Filiberto Bilotti, Nader Engheta, Lucio Vegni
Theory And Simulations Of A Conformal Omni-Directional Sub-Wavelength Metamaterial Leaky-Wave Antenna, Andrea Alù, Filiberto Bilotti, Nader Engheta, Lucio Vegni
Andrea Alù
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 …