## What is/are Double Negative Metamaterial?

Double Negative Metamaterial - The measurements verified that metamaterials of both types behave as a double negative metamaterial within a narrow frequency band.^{[1]}This article investigates how beam steering makes the antenna intelligent by increasing channel capacity, range, and reducing interference to enhance the gain of a rectangular patch array antenna for the 5G application using a novel double negative metamaterial (DNG).

^{[2]}To further improve its performance, a double negative metamaterial core is considered.

^{[3]}The plane wave diffraction by a planar structure formed by a thick flat metal and a lossy double negative metamaterial slab is addressed in this paper.

^{[4]}A high-frequency solution is presented to evaluate the diffraction contribution by the edge of a non-planar junction that consists of a metal layer and a lossy double negative metamaterial sheet.

^{[5]}The permittivity and permeability calculation results, which show that the parameters have negative values in the band gap, what proves that the proposed structure is a double negative metamaterial, are shown.

^{[6]}

## Lossy Double Negative Metamaterial

The plane wave diffraction by a planar structure formed by a thick flat metal and a lossy double negative metamaterial slab is addressed in this paper.^{[1]}A high-frequency solution is presented to evaluate the diffraction contribution by the edge of a non-planar junction that consists of a metal layer and a lossy double negative metamaterial sheet.

^{[2]}