Waveform-Selective Mantle Cloaks for Intelligent Antennas

Abstract

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 behaviour is achieved through the use of a novel waveformselective 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 behaviour 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 behaviour accordingly.

Progress and perspective on advanced cloaking metasurfaces: from invisibility to intelligent antennas

“…The functionalities of cloaking metasurfaces can be enriched even more by loading them not only with nonlinear discrete components, as in the previous cases, but by introducing more elaborated lumped-element circuit. For instance, the novel concept of a coating metasurface able switching its cloaking functionality ON and OFF depending on both the frequency-and time-domain characteristics of the imping electromagnetic wave has been recently discussed [116,117].…”

“…This unique waveform-selectivity behavior has been exploited for conceiving an innovative cloaking device [117], such as the one depicted in Figure 18. Here, a halfwavelength dipole antenna is coated by a cloaking metasurface loaded by the previously described RL waveform-selective circuit, which is able to hide the antenna to a PW signal generated by a detecting radar (Fig.…”

Waveguide Components and Aperture Antennas With Frequency- and Time-Domain Selectivity Properties

“…The iris, thus, is not able to distinguish between two signals in the same frequency range, allowed by the filter response, even though their time-domain behaviors are different. To add this functionality, we explore here the approach used in [12]- [15] for designing waveform dependent metasurfaces, which can distinguish between a short pulsed wave (PW) and a continuous wave (CW) signal.…”

Pseudo‐Waveform‐Selective Metasurfaces and their Limited Performance

“…Recently, circuit-based metasurfaces containing nonlinear Schottky diodes have been reported to discriminate particular electromagnetic waves at the same frequency depending on their waveforms, or more specifically, their pulse widths. [36][37][38][39][40] Such waveform-selective metasurfaces are expected to provide an additional degree of freedom to address a wide range of existing problems/challenges involving waves at the same frequency, for example, in electromagnetic interference, [39] antenna design, [40] and wireless communications. [38,41] Although all waveform-selective metasurfaces reported to date require the use of an electromagnetic nonlinear effect, here we demonstrate that similar phenomena can be obtained using only linear circuits and linear media.…”