<p>In modern warfare, with the rapid development of modern detection technology, enhancing stealth technology is urgent. Infrared and radar detection are primary means, and their compatible stealth is a research focus in stealth material technology. The contrasting working mechanisms of infrared and radar stealth materials, along with the Planck–Rozanov limit, impede traditional composites from achieving compatible stealth in the low-frequency band while remaining lightweight. Thus, preparing structural compatible materials is crucial. In this paper, a layered structure and reflection-reducing graphic design are used to structure the double-layer composite with a Sierpinski carpet, which has excellent electromagnetic scattering performance, and aluminum foil tape (low infrared emissivity) is selected as the infrared stealth layer and carbonyl iron (magnetic loss) as the radar-absorbing layer. By optimizing the structure, the surface units of the bottom radar layer and the top infrared outer layer, the poor stealth performance of single-coated thin-layer compatible metamaterials in the S–C low-frequency band is effectively overcome. The effective absorption (reflection loss &lt;—10 dB) bandwidth of the material is increased to 2.29 GHz, achieving compatible stealth (infrared emissivity &lt; 0.3).</p>