  The aim of this communication is to investigate and demonstrate the
possibility to overcome the fundamental limitations of mantle cloaking for
antennas by exploiting nonlinear metasurfaces. First, we recap and give
additional physical insights about the fundamental bounds that apply to the
electric properties of an antenna that is made invisible at its own resonance
frequency. Then, an innovative strategy is proposed to circumvent these limits
through the introduction of nonlinear elements that are able to dynamically
transform the geometry of the cloaking metasurface depending on the power level
of the impinging field. Different nonlinear designs are discussed, and their
effectiveness is assessed through the relevant benchmark example of a
half-wavelength dipole antenna able to efficiently transmit high-power signals
while being invisible to low-power ones. In addition, the capability of such
nonlinear mantle cloaks to enable the shaping of the radiation pattern of an
antenna array depending on the power level of the received/transmitted signal
is demonstrated. These innovative cloaking devices may find applications in
different radiating systems enabling unprecedented functionalities.
