Broadband THz DNG Metamaterials for Simplified Fabrication

This paper proposes and demonstrates a model of split-ring resonator/wire composite MTM which can create a double-negative (DNG) passband approximately two and a half times higher than those of the conventional SRR/wire structures, by using the same dimensions. Instead of exciting the magnetic field perpendicular to the structure plane, the field is parallel to the plane so that the propagation direction is normal to the plane and the electric field is parallel to the gap-side of the SRR. This higher passband can simplify the fabrication process by doubling up the size of the conventional structure in order to get the same location of the transmission band. Increasing the size of the structure significantly improves the fabrication procedure when we deal with a high frequency (THz or IR), or a very small scale (micron or nanometer). Furthermore, the new SRR/wire structure can produce a broad passband - nearly two and a half times larger than those of the primary models