Frequency-Selective Surface-Based Composite Radar Absorbing Structures Using Transferred Laser-Induced Graphene on Glass Fiber Fabric

초록

Frequency-selective surface-based radar absorbing structures (FSS-RAS) fabricated in traditional manner involves dispersing conductive fillers in polymer matrix and using metal masks for bar-coating or screen-printing on dielectric substrates. This study investigates an alternative technique of FSS-RAS that uses laser-induced graphene (LIG) periodic patterns with controllable sheet resistance engraved on polyimide (PI) precursor, transferred onto glass fiber (GF) dielectric fabric. We successfully designed and fabricated RAS using frequency-selective Jerusalem cross LIG pattern. The resulting structure, with a thickness of 2.91 mm, demonstrates 90% radar signal absorption across X-band. Additionally, short-beam shear tests revealed that interlaminar shear strength (ILSS) of the composite RAS can be enhanced when LIG layers are integrated between glass fiber fabric laminates. This study not only visualize a new type of wideband composite RAS with LIGs but also demonstrates a straight-forward scalable fabrication process including a series of LIG deposition and transferring.