There are 2 kinds of realizations of metal-based LHMs in the microwave regime.
Most of the proposed LHMs only have one left-handed (LH) passband.
up to it." (171) LHMs
differ from some of the early classified CIA
Left-handed metamaterials (LHMs
), or negative-index materials, are a new class of artificial structures with novel optical properties.
Some tunable LHMs
have been proposed by using various additional materials or structures, such as the ferrites [4-9], liquid crystals [10-12], varactors [13-16], and tunable structures [17-19].
are a series of engineering materials that show negative permittivity and/or negative permeability over a finite frequency band , which have become a subject of intensive research since it was first fabricated from metallic posts and split ring resonators (SRRs) by Smith and his co-workers .
The recent discovery of left-handed metamaterials (LHMs
) allows antennas to be designed with novel electromagnetic properties such as negative permittivity and permeability.
have both negative permittivity and permeability that were mentioned by Veselago in 1968 .His paper introduced the propagation of waves in LHMs
that is opposite to the wave vector in the right-handed materials (RHMs); LHMs
possess the negative refraction index (n) and their wave vector k is also called the "backward wave." Evanescent materials are the other type of MTMs with single negative [epsilon] < 0 or [mu] < 0 which were considered by Prendry and his colleagues thirty years later.
Resonance characteristics of SRRs and RLC circuits are similar; losses are generally low and SRRs produce sharp resonances resulting in a narrow BW for LHMs
The metamaterial artificial left-handed materials (LHMs
) were initially discovered by Veselago .
The physical properties of the negative index material with negative permittivity and permeability, or left handed materials (LHMs
), such as reversed Doppler effect, Cerenkov radiation, and Snell's law, were predicted by Veselago .
A special class of MMs are the left-handed materials (LHM