ABSTRACT
Media with single-negative (SNG) permittivity or SNG permeability and simultaneously negative permittivity and permeability, which is called double-negative (DNG) media, are under relentless interest of physicists and microwave engineers. These artificial materials are known as metamaterials. It has been shown that application of SNG materials can sufficiently improve the characteristics of many microwave devices. However, more interesting properties can be realized using DNG structures. In a limited frequency band, such materials exhibit anomalous properties: lensing beyond the diffraction limit, wave propagation in subwavelength guiding structures, resonant enhancement of the power radiated by electrically small antennas. Attempts to create an isotropic metamaterial resulted in the idea of using resonant inclusions as constituent particles arranged in a regular structure. A medium composed of a periodic lattice of resonant particles considered as scatterers generates dielectric polarization and magnetization according to the distribution of the scatterers and their polarizabilities.
