US12325224 - Lightweight, low-thickness, durable and reliable multi-band radar stealth-bulletproof integrated metamaterial
The patent describes a multi-band radar stealth-bulletproof integrated metamaterial composed of several layers, including a ceramic layer, UHMWPE fiber composite layers, a graphene-based filter layer, and a carbon fiber reflective layer, designed to attenuate radar waves while providing bulletproof capabilities. This innovative structure aims to achieve effective radar wave absorption at both low and high frequencies while maintaining a lightweight and low-thickness profile.
Claim 1
- A multi-band radar stealth-bulletproof integrated metamaterial, comprising: a ceramic layer; a bulletproof layer; a filter layer; an attenuation layer; and a reflective layer; wherein the ceramic layer, the bulletproof layer, the filter layer, the attenuation layer, and the reflective layer are stacked in sequence, and the ceramic layer serves as a projectile facing surface; the bulletproof layer is made of a first ultrahigh molecular weight polyethylene (UHMWPE) fiber composite; the filter layer is a graphene-based metamaterial layer; the attenuation layer is made of a second UHMWPE fiber composite; and the reflective layer is a carbon fiber-based composite layer; the bulletproof layer and the attenuate layer serve to attenuate incident radar waves; a circuit resonance of the filter layer serves to simultaneously generate a passband and a stopband for the incident radar waves; the bulletproof layer and the attenuation layer serve to be controlled by the filter layer in terms of working conditions within different incident radar frequency bands to establish a structure capable of generating λ/4 resonance at both low and high frequencies; the ceramic layer is formed by splicing a plurality of ceramic pieces in a shape of triangle, square, or hexagon; and each of the plurality of ceramic pieces has a thickness a 1 of 5˜10 mm, a side length of 50˜100 mm, a density ρ 1 of 1˜5 g/cm 3 , a permittivity ε r1 of 2˜3, and a dielectric loss angle tangent value tan δ e1 of 0.001˜0.01. a ceramic layer; a bulletproof layer; a filter layer; an attenuation layer; and a reflective layer; wherein the ceramic layer, the bulletproof layer, the filter layer, the attenuation layer, and the reflective layer are stacked in sequence, and the ceramic layer serves as a projectile facing surface; the bulletproof layer is made of a first ultrahigh molecular weight polyethylene (UHMWPE) fiber composite; the filter layer is a graphene-based metamaterial layer; the attenuation layer is made of a second UHMWPE fiber composite; and the reflective layer is a carbon fiber-based composite layer; the bulletproof layer and the attenuate layer serve to attenuate incident radar waves; a circuit resonance of the filter layer serves to simultaneously generate a passband and a stopband for the incident radar waves; the bulletproof layer and the attenuation layer serve to be controlled by the filter layer in terms of working conditions within different incident radar frequency bands to establish a structure capable of generating λ/4 resonance at both low and high frequencies; the ceramic layer is formed by splicing a plurality of ceramic pieces in a shape of triangle, square, or hexagon; and each of the plurality of ceramic pieces has a thickness a 1 of 5˜10 mm, a side length of 50˜100 mm, a density ρ 1 of 1˜5 g/cm 3 , a permittivity ε r1 of 2˜3, and a dielectric loss angle tangent value tan δ e1 of 0.001˜0.01.
Google Patents
https://patents.google.com/patent/US12325224
USPTO PDF
https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12325224