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<p>This work realizes an engineered metastructure in Ku-band for radar cross-section (RCS) reduction under different curvature states. The metastructure is designed by periodically embedding octagonal-shaped subwavelength EG-PUR resonators within the dielectric matrix to create electromagnetic traps, enabling more than 90% reduction. An angular stability of the unit cell up to 70° for both TE and TM polarizations is achieved. A peak RCS reduction (RCSR) exceeding 20&#xa0;dB is observed for both co- and cross-polarizations in reference to a completely reflecting surface. Monostatic RCS measurements reaffirm the performance of the metastructure in effectively reducing RCS in 12–18&#xa0;GHz range by absorption of the electromagnetic wave. The RCSR remains unaffected under mechanical deformation, confirming its suitability under conformal applications. Up to a 45° of oblique incident 10 dBsm RCS reduction is maintained under bending conditions. The proposed design offers a low-cost, lightweight, flexible, and corrosion-resistant single window alternative to other conformal RCSR materials, which can easily be mounted on multiple curvature profiles for stealth technology and electromagnetic interference (EMI) mitigation.</p>

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Shape-adaptive radar cross-section reduction (RCSR) metastructure for Ku-band

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • Debasish Das,
  • Nidhi S. Bhattacharyya

摘要

This work realizes an engineered metastructure in Ku-band for radar cross-section (RCS) reduction under different curvature states. The metastructure is designed by periodically embedding octagonal-shaped subwavelength EG-PUR resonators within the dielectric matrix to create electromagnetic traps, enabling more than 90% reduction. An angular stability of the unit cell up to 70° for both TE and TM polarizations is achieved. A peak RCS reduction (RCSR) exceeding 20 dB is observed for both co- and cross-polarizations in reference to a completely reflecting surface. Monostatic RCS measurements reaffirm the performance of the metastructure in effectively reducing RCS in 12–18 GHz range by absorption of the electromagnetic wave. The RCSR remains unaffected under mechanical deformation, confirming its suitability under conformal applications. Up to a 45° of oblique incident 10 dBsm RCS reduction is maintained under bending conditions. The proposed design offers a low-cost, lightweight, flexible, and corrosion-resistant single window alternative to other conformal RCSR materials, which can easily be mounted on multiple curvature profiles for stealth technology and electromagnetic interference (EMI) mitigation.