Metamaterial antennas are a class of antennas which use metamaterials to enhance or increase performance of the antenna system. Applying metamaterials to increase performance of antennas has garnered much interest. Demonstrations have shown that metamaterials could enhance the radiated power of an antenna. Materials which can attain negative magnetic permeability could possibly allow for properties such as an electrically small antenna size, high directivity, and tunable operational frequency. Left-handed material, also known as negative index material, and DNG metamaterial, has applications in aspects of antenna systems and sub systems. Antenna subsystems that apply metamaterials are being researched. Either double-negative slabs are used exclusively or combinations of double positive with DNG slabs, or epsilon-negative slabs with mu-negative slabs are employed in the subsystems.

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