Broadband Electromagnetic Cloaking Realized With Transmission-Line and Waveguiding Structures

Electromagnetic cloaking, or, in other words, techniques making objects “invisible” to the electromagnetic radiation, has attracted much attention in the last few years. Several different concepts have been proposed and studied analytically, numerically, and even experimentally. To make objects, especially strong scatterers, invisible to the impinging electromagnetic radiation is not an easy task. In this paper, we explain how the concept of transmission-line metamaterials, developed in the beginning of the 21st century, can be used in the creation of a special class of electromagnetic cloaking devices. We also make an overview of other approaches to electromagnetic cloaking.