Rule of Thumb for Cloaking Bandwidth Based on a Wave-Packet Argument

Author

Craeye, Christophe ; Bhattacharya, Avik

Author_Institution

Inst. of Commun. & Inf. Technol., Electron. & Appl. Math., Univ. Catholique de Louvain, Louvain-la-Neuve, Belgium

Volume

60

Issue

7

fYear

2012

fDate

7/1/2012 12:00:00 AM

Firstpage

3516

Lastpage

3520

Abstract

A simple rule is provided for the upper-bound bandwidth of 2-D invisibility cloaking in a free-space environment. The rule is based on a group-delay argument and avoids any dependence on material characteristics. It is found that the upper relative bandwidth is proportional to the ratio between wavelength and extra propagation length around the object to be cloaked. An analytical model is provided for fields on an equivalence plane just behind the cloak. In order to arrive at an upper-bound estimate for the bandwidth, the model is based on several key optimistic assumptions. The model provides an idea of the least-perturbed fields that may be expected for different quality factors.

Keywords

metamaterials; 2D invisibility cloaking; analytical model; equivalence plane; free-space environment; group-delay argument; least-perturbed fields; material characteristics; metamaterial; upper relative bandwidth; upper-bound bandwidth; wave-packet argument; Apertures; Bandwidth; Decision making; Dispersion; Materials; Q factor; Scattering; Bandwidth; cloaking; invisibility; metamaterial;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2012.2196921

Filename

6192295