The emphasis of our research is put on the potential use of double negative (DNG) materials in the antenna technology.
Recently, an increased interest in investigating the electromagnetic properties of artificial materials, known as metamaterials (MTMs), emerged in the antenna research community.
Interesting examples of the MTMs are the so-called Double Negative (DNG) materials, which are characterized by a negative real part of both the permittivity and permeability, as well as Single-Negative Materials, characterized by a negative real part of either the permittivity (the so-called Epsilon-Negative (ENG) materials) or the permeability (the so-called Mu-Negative (MNG) materials).
Theoretical considerations related to lossless DNG materials were already performed about 30 years ago by the Russian physicist V. G. Veselago, who found that the electric and magnetic field vectors of a plane wave in such materials form a left-handed set of vectors with its wave number vector. He also found that the direction of the power flow density still forms a right-handed vector set with the field vectors, as in ordinary Double-Positive (DPS) materials, which possess a positive real part of both the permittivity and permeability. As a direct consequence of these facts, the phase and group velocities are oppositely directed in DNG materials, and therefore the interaction of such materials with electromagnetic waves, e.g., microwaves and light, exhibit a range of unusual effects including backward traveling waves, negative refraction, inverse Doppler shift, and several others.
Due to the unfamiliar electromagnetic properties of DNG materials, it is of interest to conduct detailed studies of these properties and, in particular, their application in antenna technology.
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