A tunable metamaterial is a metamaterial which has the capability to arbitrarily adjust changes in the magnetic response of the medium, or the response of the refractive index. It encompasses the developments beyond the bandwidth limitations in left-handed materials by constructing various types of metamaterials. Tunable metamaterials are a segment of the continuing research into metamaterials that produce a negative refractive index. Since conventional materials exhibit very weak coupling through the magnetic component of the electromagnetic wave, artificial materials that have this abiltity are being researched and fabricated. These artificial materials are known as metamaterials. The first of these have been fabricated (in the lab) to respond to only one frequency or one frequency band. These were followed by demonstrations of metamtaerials that were tunable only by changing the geometry and/or position of their components. These have been followed by metamaterials that are tunable in wider frequency ranges.

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