An Electromagnetic Cloaking Scheme Using Magnetic Dipole Based Scattering Cancellation

This paper explores the possibility of creating a cylindrical electromagnetic cloaking scheme using resonant magnetic dipole excitation. Split-ring resonators are arranged around the cylindrical metal target to generate strong subwavelength resonant magnetic dipole moments to cancel far-field scattered power from the target. We used the multipole scattering theory to identify the actual reason behind scattering cancellation. The scattering from resonant circulating magnetic dipoles interferes destructively with that from the non-resonant electric dipole moments of the target resulting in a significant reduction in the Scattering Cross Section. The results are verified using full-wave simulation software and subsequently validated with backscattering measurements inside an anechoic chamber.

Toroidal dipole excitation in cylindrically arranged dogbone metallic inclusions

A significant excitation of toroidal moments in cylindrically arranged dogbone metallic inclusions is validated and presented in this paper. The antiparallel poloidal currents excited on the front and back faces of the proposed cylindrical dogbone inclusions create strong magnetic field confinement at the center generating intense toroidal moments on the structure. The significant excitation of toroidal dipole moment causes an improvement in the scattering cross-section from the resonant system. The resonant mechanism is analyzed using the multipole scattering theory, and we used the scattering measurement techniques to characterize the structure experimentally in the microwave regime.