Disordered Broadband Dielectric Metamaterial Absorbers for Aerospace Applications

Cloaking technology plays a critical role in modern aerospace and defense systems, where reducing the radar cross section (RCS) is essential for achieving invisibility in complex electromagnetic environments. To fulfill the requirements for lightweight and compact designs, high-performance absorbers capable of achieving broadband RCS reduction are indispensable. However, conventional periodic dielectric metamaterial absorbers, despite their lightweight advantages, are inherently constrained by narrow absorption bandwidths, limiting their effectiveness across broad frequency ranges. This study investigates the influence of disorder factors, including permittivity, size, and position, on wave absorption performance in comparison to periodic structures. An innovative design for dielectric metamaterial absorbers employing disordered structures is presented, effectively addressing bandwidth limitations while achieving polarization independence, angular insensitivity, and enhanced broadband absorption. The lightweight and low-profile configuration of the absorber makes it particularly suitable for aerospace applications, offering an advanced solution for cloaking technology and system miniaturization in modern defense systems.