Wideband tunable and non-foster mantle cloaks

We discuss the possibility of loading metasurface “mantle” cloaks with passive / active electronic circuitry to improve their tunability and increase their bandwidth of operation. The nature of the mantle cloaking technique, which is based on a patterned metallic surface aimed at cancelling the scattered field from an object of choice, is perfectly suited for integration with electronic components. Its ultrathin, conformal and non-resonant design has been shown both theoretically and experimentally to be able to significantly suppress the total scattering cross-section (SCS) of dielectric and conductive objects in cylindrical and spherical geometries. Here we explore practical designs of metasurfaces loaded with passive and active circuitry, such as varactors and non-Foster circuit elements, aimed at adding real-time tunability and increasing the bandwidth of operation of mantle cloaking technology.