A Camouflage Device Without Metamaterials

Abstract

We propose a camouflage device that can greatly reduce scattering in the microwave frequency using only uniform copper plates with no internal structuring (no metamaterials). The camouflage device is designed by optical surface transformation (OST), which is derived from transformation optics but much simpler than transformation optics. The key of our design is to choose suitable arrangement and lengths of these copper plates that satisfy Fabry-Perot condition. The proposed camouflage device can work when the detecting wave comes from a wide-angle range (not only works for some discrete angles). The proposed method will give a new and simple way to design and realize camouflage device.

Deterministic Approach to Achieve Full-Polarization Cloak

“…We first design a full-polarization illusion device [ 40 , 41 ] which can be considered as a special case of a cloak. Such an illusion concept finds unprecedented applications in deception jamming of an electronic warfare and coincides well with that of camouflage [ 42 ] in terms of mimicking the scattering signature of other arbitrarily predefined objects. Although a broadband camouflage device is realized in wide-angle operation through optical surface transformation [ 42 ], the cloak works still under a specific polarization detection and the lateral displacement is unavoidable due to the bulk volume.…”

Transformation Metamaterials

“…[107,108] There are many TO devices and fabrications based on ONM. [106,[109][110][111][112] In practice, the ONM is hard to achieve in broad band of frequencies. A simplification of ONM was proposed by requiring Fabry-Pérot (FP) resonances along extension path, namely the phase accumulation along the extension path to be integer times of 2π.…”

Ultrawideband chromatic aberration-free meta-mirrors

“…7,8 However, these devices are seriously limited by their bulky size, complex fabrication, narrow operation band, and low efficiencies due to the inherent resonant property and material dispersion. Recently, metasurfaces, as a planar version of 3D metamaterials, provide a powerful capability to manipulate the amplitude, phases, and polarizations of EM waves, leading to a lot of fascinating phenomena and effects, such as anomalous refraction and reflection, [9][10][11][12] planar meta-holograms, [13][14][15][16] achromatic meta-lenses, [17][18][19][20][21][22][23][24][25][26] surface plasmon polaritons meta-couplers, [27][28][29][30] multifunctional metasurfaces, [31][32][33][34] meta-cloaks, [35][36][37][38][39] and many others. [40][41][42][43][44][45][46][47][48][49][50][51][52...…”

“…For one thing, most of the reported metasurfaces suffer from limited chromatic aberration ability and narrow bandwidth. [9][10][11][12][13][14][15][16][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]54 These metasurfaces are predesigned at a target frequency of f 0 with a certain phase gradient, and, as such, a pure single-mode EM functionality with high-efficiency can be observed at f 0 based on the generalized Snell's law. [9][10][11][12] However, the device performances and working efficiencies degrade significantly as the frequency is away from f 0 due to the intrinsically undesired dispersions of resonant meta-atoms.…”