Design of a frequency selective rasorber based on aramid paper honeycomb structure

This work describes a honeycomb frequency selective rasorber used in thin film absorbing material consisting of independent absorption and transmission channels. The second-order coupled-slotline frequency selective structure with stepped impedance resonator produces a passband, while a lossy absorbing material produces an absorption band above the passband. The honeycomb absorber with a thickness of 20mm has a minimum insertion loss of 1dB in the passband, and the absorption band is from 8.58GHz to 14GHz.The oblique incidence maintains stable within 30°.