A zero refraction metamaterial and its application in electromagnetic stealth cloak

In this paper, a “+−” type metamaterial planar zero refraction metamaterial is proposed, which is composed of “+” and “−” shapes printed on both sides of the FR4 substrate, with a zero refraction bandwidth of 5.86GHz. By simulating the electric field distribution of the triangular prism and measuring the sample with the free space method, the zero refraction property of the sample is verified. A rectangular stealth cloak is constructed using the designed zero refraction metamaterials, which can make electromagnetic stealth of the shielding object in 2.2–4.3 GHz, overcome the strong distortion of the exposed object in the electromagnetic field, achieve fine wave front reconstruction, and effectively reduce the shadow behind the object. The basic structure of zero refraction metamaterials and the design method of stealth cloaks proposed in this paper have great potential to expand the application space, which will provide important reference for the application of zero refraction metamaterials in the field of electromagnetic stealth.