A bezier-shaped electromagnetic camouflaging meta surface

Abstract

Metasurface yields fantastic progress in diverse functional electromagnetic devices. However, in previously reported works, high-performance camouflaging device with curved metasurface for complex conformal target still keeps elusive. Herein, a novel and efficient Bezier-shaped metasurface is proposed based on the revised phase distribution equation. The prototype of camouflaging metasurface using a Bezier surface as the profile is designed, fabricated, and characterized by experimentally measuring the radiation patterns at both normal and 15° oblique incidence. The camouflaging metasurface has hundreds of ultrathin liquid–metal-based unit cells operating at microwave frequencies and mimics the reflection behaviors of a pre-designed triangular shape to conceal the electromagnetic perception of the original Bezier surface. The differences of the reflection coefficients between the metasurface and the target is only 20% of those between the bared bump and the target. The simulated and measured results show that the 3 dB reduction bandwidth is about 30% for both transverse electric (TE) and transverse magnetic (TM) polarizations. The proposed metasurface possesses a broadband generalized radar cross section (RCS) reduction. This work realizes the rapid design of complex curved camouflaging metasurface with versatile electromagnetic wave control abilities. The proposed metasurface can be applied to the stealth of objects with complex shapes and opens a new avenue to facilitate the practical application of artificial electromagnetic devices.