Optically Transparent Ultrawideband Electromagnetic Stealth Metasurface for Microwave Absorption and Scattering
Yuzhou Ran, Lihua Shi, Shuran Wu, Jie Li, Xin Jin, Zhenwei Hou, Bo Fan, Jianbao Wang
Abstract
For the issue of stealth and electromagnetic protection of weapons and equipment in strong electromagnetic pulse (EMP) environment, a transparent double-sided ultrawideband metasurface is proposed to realize wave absorption/absorption-scattering integrated function in two directions. The interactions between backscattered waves produced by the meta-atoms are manipulated and optimized simultaneously by hybrid far-field scattering pattern analysis and genetic algorithm to achieve ultra wideband destructive interference. Both simulation and experimental results demonstrate that the polarization-independent −10 dB radar cross section (RCS) reduction performance can be achieved for more than 128% of the fractional bandwidth (4–18.25 GHz) at forward incidence, and the absorption more than 90% in the range of 2.75–12.75 GHz (fractional bandwidth more than 129%) at backward incidence. The scattering and absorbing characteristics of the metasurface are still well maintained in the range of 0°–50° oblique incidence. The method of this letter has an important prospect in related applications of strong EMP stealth and protection technology under the integration of information equipment in the future.