“…[1][2][3] Over the past few decades, microwave absorption materials with the advantage of flexible, lightweight, thermally, thin in thickness, and strong in absorption over a broad absorption frequency range are highly enjoyed for aircraft and electronics. 1,2,[7][8][9] Of all the critical electromagnetic wave absorption materials, polymer-derived ceramics (PDC), including SiOC, SiBCN, SiCN, and Si 3 N 4 , have captured growing attention due to their controllable microstructure, lightweight, excellent thermomechanical properties, and a wide absorption frequency. 1,2,[7][8][9] Of all the critical electromagnetic wave absorption materials, polymer-derived ceramics (PDC), including SiOC, SiBCN, SiCN, and Si 3 N 4 , have captured growing attention due to their controllable microstructure, lightweight, excellent thermomechanical properties, and a wide absorption frequency.…”