• The proposed CFSR achieves a wide −1 dB transmission band (8.79–10.41 GHz) with low insertion loss (0.44 dB at 9.59 GHz) and two high absorption bands (>90%) with wide-angle stability up to 60°.
• The design integrates three metasurfaces and a 3D-printed metastructure, simplifying the transmission band design while enhancing absorption performance.
• Equivalent circuit model (ECM) and impedance characterization elucidate the physical mechanisms, providing a systematic design methodology for high-performance Rasorbers.
• Experimental results confirm the simulated performance, demonstrating the practical viability of 3D-printing technology in advanced electromagnetic structures.