This invention discloses an integrated ultra-
wideband absorbing material. From top to bottom, the material comprises a first lossy
dielectric substrate, multiple lightweight interlayers, five resistive frequency selective surfaces, a
metal backplate, and a
composite material frame penetrating between the
layers. Through slots are formed between the square rings and concentric geometric patterns of each resistive frequency
selective surface. The
composite material frame is embedded in these slots and continuously arranged along the thickness direction, creating a non-uniform
dielectric structure within the material composed of high-
dielectric and low-dielectric regions. This structure jointly regulates the
resonance conditions and equivalent impedance gradient of the multiple resistive frequency selective surfaces, shifting the low-frequency absorption
initiation frequency towards lower frequencies without increasing the thickness, and maintaining stable absorption performance at large
oblique incidence angles. Simultaneously, the
composite material frame improves the overall structural
mechanical stability. This invention achieves thinness, wide bandwidth, and wide-angle absorption characteristics, making it suitable for electromagnetic stealth and
electromagnetic compatibility applications.