Analysis of uniaxial multilayer cylinders used for invisible cloak realization

Abstract

Recently, an uniaxial multilayer cylinder cloak which does not scatter electromagnetic wave was proposed. However, the metamaterial realization only reduces the scattered field and is suitable only for excitation by a TM-polarized wave. Furthermore, it works only in a narrow frequency band. The purpose of this paper is to analyze such a cloak and to characterize the achieved "invisibility" in mathematical terms by calculating the scattered field and equivalent blockage width -the structure width that is actually "perceived" by EM waves. Therefore, mathematical analysis for TM-excitation is provided and the simulations are performed using the G1DMULT algorithm. The results show large sensitivity of reduction in the equivalent blockage width on the number of anisotropic layers used for cloak realization.

Towards active dispersionless ENZ metamaterial for cloaking applications

“…A very recent analytical study [4] revealed that the anisotropic cloak introduced in [3] has an operating bandwidth of only 0.24%. Thus, it appears that the material dispersion is indeed a major limiting factor on the operating bandwidth of the proposed cloaking devices.…”

Analytical solution of scattering by a DB/D′B′ cylinder coated with multilayer anisotropic media for cloaking applications

“…In Cloak I, only μ ρ , μ j and ε z components are relevant for the normal incidence of TM z polarisation. Second validation of the presented relation is provided by comparing the result of normalised bi-static scattering width of DB and PEC cylinder coated with Cloak I in TM z excitation [13]. This result can prove the validity of the presented formulations.…”

“…Also, the total scattering width of the D′B′ boundary condition is given in Fig. 2b compared with the results that were calculated by Ivsic et al [13] for TE z excitation. This comparison shows an excellent agreement and validates the presented relations and results.…”

“…As the first step, the accuracy of the analytical formulations is tested using the published literature [13]. For validating the presented formulations, total scattering width of the cloaked cylinder (σ T ) is considered.…”

Dispersion study on scattering cross section of metamaterial cloak due to various cloaking parameters

“…Scattering coefficient study in different cylindrical wave orders have been shown with simplified material properties [11,12]. Until now, discussions on the bandwidth and practical limitations of electromagnetic cloak present in the published results [13][14][15][16][17][18] are few in number.…”