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Pangolin-Inspired Stretchable, Microwave-Invisible Metascale.

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  • 1Innovative Center for Flexible Devices (iFLEX), Max Planck - NTU Joint Lab for Artificial Senses, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.

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This study introduces pangolin-inspired metascale (PIMS), a novel stretchable metamaterial for robust microwave absorption. PIMS demonstrates superior performance on complex surfaces, overcoming limitations of conventional absorbers.

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Area of Science:

  • Materials Science
  • Electromagnetics
  • Metamaterials

Background:

  • Conventional microwave absorbers lack stretchability, limiting applications in deformable or complex-shaped targets.
  • Existing technologies struggle with maintaining performance under mechanical strain and conforming to non-planar surfaces.

Purpose of the Study:

  • To develop a stretchable metamaterial with robust microwave absorption capabilities.
  • To overcome the limitations of conventional microwave absorbers for applications in soft robotics, shape-morphing structures, and electronic countermeasures.

Main Methods:

  • A soft-rigid-connection strategy inspired by pangolins was employed.
  • Pangolin-inspired metascale (PIMS) was designed, comprising electromagnetic dissipative scales (EMD-scales) and an elastomer.
  • The device was tested for microwave absorption under 50% stretching and its mechanical properties were evaluated.

Main Results:

  • PIMS exhibits robust microwave absorption capacity even under 50% stretching.
  • The out-of-plane indentation failure force of PIMS is at least 5 times greater than conventional devices.
  • On nondevelopable surfaces, PIMS achieved significant radar cross-section (RCS) reduction, outperforming conventional devices.

Conclusions:

  • The proposed PIMS offers a novel platform for stretchable, nondevelopable surface-conformable functional devices.
  • This technology enhances microwave invisibility for deformable and complex targets.
  • The pangolin-inspired design provides a unique combination of mechanical robustness and electromagnetic performance.