  We present the design of an innovative wire antenna able to automatically
hide or reveal its presence depending on the waveform of the
received/transmitted signal. This unconventional behavior is achieved through
the use of a novel waveform-selective cloaking metasurface exploiting a
meander-like unit cell loaded with a lumped-element circuit capable to engineer
the scattering of the antenna depending on the waveform of the impinging
signal. Due to the time-domain response of the lumped-element circuit, the
antenna is able switching its scattering behavior when interacts with either a
pulsed wave (PW) or a continuous wave (CW) signal. The proposed configuration
paves the way to a new generation of cloaking devices for intelligent antenna
systems, extending the concept of antenna as a device capable to sense the
external environment and change its electromagnetic behavior accordingly.
