Wideband Tunable Metamaterials with Magnetic Ferrite and/or Hydrargyrum

This paper summarizes the recently developed tunable metamaterials, especially the ferrite inspired magnetic tunable metamaterials. Then a new kind of thermal tunable metamaterial composed of the thermal sensitive metal, the hydrargyrum (Hg), is discussed theoretically and numerically. Lastly, we propose the design rule of wideband tunable metamaterial composed of both the ferrite and the Hg. This paper is aim to open the new route to achieve the new metamaterials with wideband and tunable negative refractive index metamaterials.