A meta-substrate to enhance the bandwidth of metamaterials

Abstract

We propose the concept of a meta-substrate to broaden the bandwidth of left-handed metamaterials. The meta-substrate, which behaves like an inhomogeneous magnetic substrate, is composed of another kind of magnetic metamaterials like metallic closed rings. When conventional metamaterial rings are printed on this kind of meta-substrate in a proper way, the interaction of the metamaterials units can be greatly enhanced, yielding an increased bandwidth of negative permeability. An equivalent circuit analytical model is used to quantitatively characterize this phenomenon. Both numerical and experimental demonstrations are carried out, showing good agreement with theoretical predictions.

Profile miniaturization and performance improvement of a rectangular patch antenna using magnetic metamaterial substrates

“…Air matrix was chosen in this study to get the real part of e r close to 1 that is the necessary condition for using Eqs. (1)(2)(3)(4)(5) in this case. In fact, the real part of e r cannot be equal to 1 for any real two-component metal-dielectric composite.…”

“…In this case, using Eqs. (4), (5), and (7) finally gives: L magn 5 0.000453 v and W magn 5 0.0347 v. Free space FDTD simulations for the magnetic metamaterial substrates have shown that Iron cylinders must be partially magnetized in such a way that the relative permeability of Iron l i is equal to 181.2157. As mentioned above it is also supposed that e r 51.…”

“…However, numerous numerical experiments (with use of the above mentioned FDTD software) have shown that Eqs. (2)(3)(4)(5) can be used for the case e r 511D, 0<D 0.2.…”

“…Substrate applications of metamaterials is a fast-developing area in Applied Electromagnetics [1][2][3][4][5][6]. One of the most popular subjects of this area is regarded to antennas applications.…”

Theoretical Analysis for Systematic Design of Flexible Broadband Radar Absorbers Using the Least-Square Method

“…In order to enlarge the bandwidth, two popular techniques used, consists of incorporating resonating elements working at nearby frequencies by arranging them on the same plane [14,15] or by using multi layers [16,17] at the expense of a drop in the absorption at certain frequencies in the bandwidth and/or bulkiness. Genetic algorithms [18] and software based optimizations are also used to obtain broadband absorption. However with these methods the physical insight of how absorption is obtained is always debatable.…”