Fig. 1. Schematic of the 3D meta-atom-based multispectral stealth material.

Fig. 2. Schematic of the 3D meta-atom: (a) side view of the 3D meta-atom, (b) top view of the IRSL, (c) top view of the MAU.

Fig. 3. Design of the IRSL. (a) The simulated transmittance of the IRSL with respect to frequency for various Rs2 and w. (b) The correlation chart between the IR emissivity and microwave transmittance spectra for IRSL design.

Fig. 4. Effect of variation in the imaginary part of relative permittivity and permeability on the absorptivity: (a) three-dimensional map; (b) two-dimensional map.

Fig. 5. Retrieved constitutive parameters and normalized impedance for different models.

Fig. 6. Scatter distribution plots of the imaginary part of relative permittivity versus the imaginary part of relative permeability at frequencies from 2 to 20 GHz for different models (the yellow area indicates the range where predicted absorptivity is over 90%).

Fig. 7. (a) Simulated absorption curves for different models. (b) Simulated frequency-dependent power loss of the constituents in the 3D meta-atom for Model-IV.

Fig. 8. Scatter distribution plots of the imaginary part of relative permittivity versus the imaginary part of relative permeability (top) and pie chart analysis on the consistency of predicted and simulated absorptivity (bottom) at frequencies from 2 to 20 GHz for different models.

Fig. 9. (a) Simulated absorption curve and (b) simulated variation curves of FBW with oblique incidence angles under TE and TM polarizations for the proof-of-concept prototype.

Fig. 10. Simulated absorptivity of the proof-of-concept prototype under oblique incidence with TE and TM polarizations.

Fig. 11. Measurement results of the fabricated prototype. (a) Photographic image of the prototype. (b) Visible transmission measurement. (c) Measured IR emissivity spectra (left) and comparison of measured and simulated microwave absorptivity (right). Inset: photograph of microwave absorption performance measurement scenario.

Fig. 12. Measured absorbance curves of the prototype under oblique incidence with (a) TE and (b) TM polarizations.

Fig. 13. Thermal infrared image of (a) glass substrate with uniform temperature distribution on the thermal plate and (b) continuous ITO, IRSL, and PET on the glass substrate.