A GL Double Layer EM Cloaks In Broad Frequency Band And Reciprocal Law

TL;DR

This paper introduces a novel double-layer electromagnetic cloak that operates over a broad frequency band, overcoming limitations of previous cloaks by restoring wavefield excitation inside the concealment, ensuring reciprocity, and avoiding superluminal issues.

Contribution

The paper presents a new GLWF double layer EM cloak with two distinct layers, each with specialized materials, achieving broad-band invisibility, wavefield excitation inside the concealment, and compliance with physical laws.

Findings

The GLWF double layer cloak functions effectively over a broad frequency band.

It restores electromagnetic wavefield excitation inside the concealment.

It satisfies the reciprocal law, unlike previous cloaks.

Abstract

In this paper, we propose a novel GLWF double layer EM cloak in the broad frequency band. The GLWF double layer cloak consists of two sphere annular layers, two type cloak materials are proposed and installed in its each layer, respectively. The outer layer of the GL cloak has the invisible function in broad frequency band, while its inner layer has the fully absorption and rapid delay function. The GLWF double layer cloak overcomes the following difficulties of the single layer PS cloak. (1) There exists no EM wavefield can be excited inside the concealment of the PS cloak, the concealment of the PS cloak is blind. Our GL double layer cloak recovered that the EM wave field can be excited inside the concealment of the GL double layer cloak. (2) There is exceeding light speed physical violation in PS cloak, its invisibility only in very narrow frequency band. Our GLWF double layer cloak corrects the violation. (3) The reciprocal law is satisfied in our GL double cloak media. However, the PS cloak damaged the reciprocal law.. The simulations and comparisons of the EM wave field propagation through the GLWF double cloak, GL double cloak and GL double layer with PS outer layer are presented to show the advantages of the GLWF double layer EM cloak The GL double layer cloaks are proposed by our GL EM modeling and inversion. The 3D GL EM modeling simulations for the double layer cloak are presented. The copyright and patent of the GLWF double layer cloak materials and GL EM modeling and inversion in this paper are reserved by authors in GL Geophysical Laboratory.