Figure 3
From: Molding acoustic, electromagnetic and water waves with a single cloak
Numerical computation of radar cross section (RCS) for cloak and cylindrical rigid obstacles versus frequency (two-dimensional simulations with Comsol Multiphysics).
A small infinite conducting (resp. rigid for pressure waves) obstacle surrounded by cloak (solid dark blue curve) is slightly above RCS of cloak on its own (dotted green curve), but lower than RCS of small infinite conducting (resp. rigid) obstacle (dotted red curve), which is itself smaller than RCS of large infinite conducting (resp. rigid) obstacle of same diameter as the cloak (solid black curve) up to 7 GHz (resp. 8 KHz for pressure waves). Panels (a), (b), (c) further show the real part of the transverse magnetic (resp. pressure) field for a plane wave incident at 4.5 GHz (resp. 5 KHz) from the left on the small obstacle surrounded by the cloak on the small obstacle on its own (a), on the large obstacle (b) and on the cloaked obstacle (c).
