CRLH metamaterial leaky-wave and resonant antennas

By Christophe Caloz, Tatsuo Itoh, Andreas Rennings. IEEE Antennas & Propagation Magazine, 2008

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Planar Leaky-Wave Antenna With Flexible Control of the Complex Propagation Constant (2012, background): “Composite rightleft handed microstrip lines (CRLH) have also been engineered to conceive “metamaterial” MLWAs [10]–[12].”
Scalar and Tensor Holographic Artificial Impedance Surfaces (2010, background): “Recently, other kinds of two-dimensional metamaterials have been designed to provide other exotic properties such as left-handed materials [8]–[10].”
Transversal Asymmetry in Periodic Leaky-Wave Antennas for Bloch Impedance and Radiation Efficiency Equalization Through Broadside (2014, background): “However, P-LWA implementations with metamaterial-type transmission lines, in particular composite right/left-handed (CRLH) LWAs, have been recently shown to radiate in their fundamental space harmonic [6], [7].”
Metasurfaces and their applications (2018, background): “Figure 7A [113] indicates a 2D composite right-/left-handed (CRLH) structure with a coaxial probe feed at the center of the surface.”