ABSTRACT
The concepts of nonradiating sources, invisible particles, and minimum-scattering antennas have been investigated in a variety of scientific fields. This chapter provides an overview of some of the proposed cloaking techniques that employ metamaterials, and discuses their analogies and differences and the physics underlying their functionality in light of the unusual features of metamaterials. Materials with low and negative values of permittivity are available in nature at terahertz, infrared, and optical frequencies. Coordinate transformation techniques for cloaking applications have been analyzed by several groups in different theoretical and experimental papers. The strong resonances associated with the technique may produce strong sensitivity to losses, frequency, and other design variations, which indeed need further exploration. The chapter presents simulation results for the scattering cancellation technique, and highlights its main features and providing physical insights into the involved mechanisms. It reviews three other cloaking techniques involving metamaterials.
