Ultra-wideband diamond-shaped metamaterial absorber for radar cross section reduction

Defrianto Defrianto (Department of Physics, Universitas Riau, Pekanbaru 28293, Indonesia)
Erwin Kurnia (Department of Physics, Universitas Riau, Pekanbaru 28293, Indonesia)
Saktioto Saktioto (Department of Physics, Universitas Riau, Pekanbaru 28293, Indonesia)
Tengku Emrinaldi (Department of Physics, Universitas Riau, Pekanbaru 28293, Indonesia)
Feby Nur Sakinah (Department of Physics, Universitas Riau, Pekanbaru 28293, Indonesia)
M Ikhsan (Department of Physics, Universitas Riau, Pekanbaru 28293, Indonesia)
Vepy Asyana (Department of Physics, Universitas Riau, Pekanbaru 28293, Indonesia \\ Department of Physics, Institut Teknologi Bandung, Bandung 40132, Indonesia \\ Department of Physics, Kyushu University, Fukuoka 819-0395, Japan)
Yan Soerbakti (Universitas Riau)

Science, Technology, and Communication Journal
Vol. 6 No. 2 (2026): SINTECHCOM Journal (February 2026)

This study presents the design and full-wave simulation of a diamond-shaped metamaterial absorber configured in a 4×4 array for applications in radar cross section reduction (RCSR). The structure was modeled on an FR-4 substrate with a copper patch and metallic ground plane to achieve high absorption across the ultra-wideband (UWB) frequency range of 0.09 – 10 GHz. Simulations were conducted using CST Studio Suite. Key radar-related performance parameters including reflection (S11), transmission (S21), and absorption were analyzed. Results indicate that the absorber achieves extremely low reflection values (return loss up to -85 dB), near-zero transmission due to the ground plane, and absorption exceeding 80% in targeted radar bands. These findings demonstrate the high potential of diamond-shaped metamaterial absorbers for stealth applications and electromagnetic wave attenuation in modern radar systems.