Invisible Electromagnetic Huygens’ Metasurface Operational in Wide Frequency Band and Its Experimental Validation

Electromagnetic Metasurface with Object Information and Position Illusion in Radar Vision at Microwave Frequencies

“…[24] In our previous work, the blocking gate unit was used to modulate the amplitude and phase response of the reflected electromagnetic waves. [23,29] Analogous to the Minkowski unit in Ref., [30,31] we can effectively increase the number of resonance points and modulate resonance frequency by adjusting the length of the central ridge s of the blocking gate unit. When s is small, the resonance occurs at the corners of the pattern edges when the electromagnetic wave is incident because the edges of the pattern are far apart, as shown in the inset of the yellow box in Figure 2b.…”

“…The coding sequence of metasurfaces provides a vast design space, and the functionality of the metasurface carpet cloak has become increasingly sophisticated. [19,20,21,22,23,24] However, metasurfaces have not yet been associated with illusion creation and display on a fabricated position. This means that detection systems may detect a different image on a fabricated position than what the real metasurface displays, potentially leading to the acquisition of false information about the target.…”

Terahertz tunable vanadium dioxide metasurface for dynamic illusion and cloaking

“…The existing main illusion methods include the carpet cloak, 2 , 4 holography mimicry, 5 , 6 , 7 external cloak, 8 and perturbative metasurface. 9 , 10 The main cloaking design methods include the absorber, 11 carpet cloak, 12 , 13 , 14 , 15 mantle cloak, 16 , 17 , 18 , 19 and cascaded metasurfaces. 20 However, the above illusion and cloaking devices are valid for the incident EM wave with a specific frequency, angle, or polarization, exhibit a single illusion or cloaking function, are structurally complex, or can’t effectively protect the target due to the planar structures.…”

Symbiotic Electromagnetic Shadow for Regional Invisibility and Camouflage

“…However, for two-sided or three-sided angle structures, , which are very commonly seen structures, the strong scattering source at the corner point is conspicuous due to multiple reflections and distance direction compression in radar vision. Other existing hiding skills include phase-gradient metasurface-based cloaks and tunable smart cloaks. − However, these camouflage techniques have strong restrictions on shielded targets as metasurface-based cloaks have a fixed slope. Hiding skills based on coding metasurfaces have been developed since 2014, which opens different possibilities for camouflage. − By breaking away from ordered and continuous phases, coding metasurfaces seek to maximize the chaos of the surface cell phases, dispersing and redirecting electromagnetic waves, which decrease the scattering of the covered object.…”