The advancement of modern electromagnetic technologies relies on the development of original theoretical approaches and new artificial materials. Artificially structured composites, known as metamaterials, exhibit unique properties that do not exist in natural materials, broadening human abilities in manipulating electromagnetic waves. Metamaterials affect electromagnetic waves by having structural features that are significantly smaller than the operation wavelength and behave as essentially homogeneous media that can be accurately described by effective constitutive parameters. The design of metamaterials enables intriguing uses of electromagnetic waves such as perfect lens with subwavelength precision and high sensitivity detectors, as well as new concept antennas, which have been receiving significant attention among both scientific and engineering communities. In this special issue, we invite researchers to contribute original research articles as well as review articles that will stimulate the continuing efforts on the understanding of metamaterials and exploration of their applications in electromagnetic engineering.

Potential topics include, but are not limited to:

• Negative-index and zero-index metamaterials
• Chiral metamaterials and asymmetric transmission
• Nonlinear and tunable metamaterials
• Loss compensation in active metamaterials
• Fano resonances and electromagnetically induced transparence
• Left- and right-handed transmission lines
• Metamaterial-based antennas and communication systems
• Plasmonic metamaterials and nanoantennas
• Transformation optics