A radar-infrared bi-stealth structure based on metasurfaces

Abstract

In this work, the authors proposed a thin artificial structure that could give rise to the strong reduction of both radar wave reflection and infrared thermal emission. This is realized by the subtle combination of two specifically designed metasurface layers that control the infrared emission and microwave absorption, respectively. Our measurement shows that the fabricated sample could have wideband absorption from 3–8 GHz with attenuation efficiency larger than 90% up to incident angles of 30°. In the infrared atmosphere window, it gives a very low emission value of about 0.2. These results show that our sample is practically very promising for the application of a radar-infrared bi-stealth technology.

Hierarchical Metamaterials for Multispectral Camouflage of Infrared and Microwaves

“…Unfortunately, no such materials exist that simultaneously satisfy these requirements. Many modeling and experimental efforts have been put forward to artificially engineer a suitable material, for example, by mixing metal powders with radar‐absorbing materials, shielding the radar‐absorbing structure with radar‐transparent patterned metal arrays or by harnessing the structure of 1D photonic crystals to mismatch the requirements of multiple spectral control. The major shortcoming of these approaches is that they focus solely on lowering the emissivity within the entire IR range while maintaining a stealth performance with in the microwave range.…”

Flexible and Transparent Microwave–Infrared Bistealth Structure

“…[26][27][28] Compared with traditional composite absorbers, metamaterial structures possess more freedoms for the realization of multispectral stealth. [30], a dual-layer metasurface was adopted to realize microwave-IR bistealth performance, which can absorb the radar wave between 3 and 8 GHz and simultaneously realize a low IR emission of 0.2. [29][30][31][32][33] In ref.…”

“…Specifically, the emissivity ε FSS of the FSS can be calculated as [29][30][31] (1 ) Here, the ISL is implemented by using capacitive frequency selective surface (FSS) due to the low-pass filtering characteristic.…”

“…[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Many intriguing devices based on metamaterial have been proposed in the stealth field, such as perfect absorber, [17][18][19][20] invisible cloak, [21][22][23][24][25] and low-scattering material. [29][30][31][32][33] In ref. Recently, several metamaterial structures have been proposed to achieve multiple-spectral stealth performances.…”

“…Recently, several metamaterial structures have been proposed to achieve multiple-spectral stealth performances. [29][30][31][32][33] In ref.[30], a dual-layer metasurface was adopted to realize microwave-IR bistealth performance, which can absorb the radar wave between 3 and 8 GHz and simultaneously realize a low IR emission of 0.2. Afterward, microwave transmission window and optical transparency have been integrated in single metamaterial.…”