Multiband and Wideband Bilayer Mantle Cloaks

Using two suitably tailored concentric cloaking metasurfaces, we demonstrate several interesting features of these covers, including significant broadband and/or dual-band scattering reduction. We also show that nearly perfect cloaking for moderately sized targets is enabled by complementary bilayer pairings. We apply these concepts to realistic bilayer cloaks covering a finite-length conductive rod for multiband and wideband operation, offering a >5-dB (70%) scattering suppression over bandwidths that exceed any passive mantle cloak demonstrated so far by over nine times. Finally, we apply the same covers to more complex geometries, showing that moderate scattering suppression is maintained, despite the change in geometry and increased size.