▎ 摘　　要

NOVELTY - Use of graphene in spraying slurry for filter, is claimed. USE - The graphene is useful in spraying slurry for filter (claimed), preferably Fifth generation (5G) filer. ADVANTAGE - The graphene improves the conductivity of spraying slurry and binding property to ceramic substrate, improves the existing 5G filters, ensures low insertion loss, high Q value, uniform binding effect and low sintering temperature. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a spraying slurry comprising 1-3 wt.% glass powder, 10-20 wt.% organic carrier, 0.1-5 wt.% film forming additive, 0.1-1 wt.% graphene and remaining of silver powder; (2) a method for preparing the spraying slurry, involving uniformly stirring and mixing glass powder, organic carrier, film-forming additive, graphene and silver powder, grinding and dispersing to obtain the spraying slurry; and (3) a filter comprising ceramic substrate, and coating ceramic substrate with above-mentioned spraying slurry.