International Journal of Scientific Research and Engineering Development

This paper presents a dual-band rasorber exhibiting two transmission windows and three absorption states (A/T/A/T/A) in the microwave frequency range. The proposed structure consists of a two-layer metasurface configuration comprising a patterned lossy layer and a complementary lossless layer, enabling controlled multi-band spectral response. The lossy layer employs a four-fold symmetric arrangement of coupled rectangular resonators integrated with multi-branch dipole elements and lumped resistors, supporting both absorption and transmission resonances. The lossless layer is designed to introduce two corresponding transmission bands that align with those of the lossy layer, enabling efficient energy tunneling at the desired frequencies. The rasorber demonstrates three absorption bands at 4.6–5.3 GHz, 6.58–8.32 GHz, and 11.15–12.17 GHz, along with two transmission windows at 5.98–6.38 GHz and 9.1–9.85 GHz, both exhibiting with very low insertion loss. Additionally, stable performance is maintained under oblique incidence up to 30°, making it suitable for stealth radome and advanced electromagnetic filtering applications.

Kasun Athapatthu, Li Chen,"Dual-Band Rasorber With Two Transmission Windows and Three Absorption Bands for A/T/A/T/A Spectral Response" International Journal of Scientific Research and Engineering Development, V9(3): Page(1551-1555) May-June 2026. ISSN: 2581-7175. www.ijsred.com. Published by Scientific and Academic Research Publishing.