▎ 摘　　要

NOVELTY - Foam absorbing substrate comprises 1-15 pts. wt. graphene oxide, 40-58 pts. wt. methacrylonitrile, 40-58 pts. wt. methacrylic acid, 0.1-0.2 pts. wt. co-solvent, 0.25-0.5 pts. wt. initiator, 2-8 pts. wt. cross-linking agent, 2-8 pts. wt. foaming agent and 0.1-0.6 pts. wt. auxiliary agent. USE - The foam absorbing substrate is useful for manufacturing broadband radar antenna. ADVANTAGE - The substrate has uniformly distributed density, wide absorbing frequency band, strong mechanical property and good stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the foam absorbing substrate, comprising mixing methacrylonitrile, methacrylic acid, co-solvent, initiator, cross-linking agent and foaming agent to obtain a mixed solution, adding graphene oxide into the mixed solution, dispersing, adding auxiliary agent and dispersing to obtain raw material liquid, casting the raw material liquid into closed cavity and polymerizing to obtain a copolymerized plate, pre-heating the copolymer plate and foaming.