The microwave power transmission is a very useful technology. Especially, a flexible rectenna can have many applications as it can be freely transformed to fold flat. Two conductive non-woven fabrics are examined as a material of microwave transmission lines for the flexible rectenna in this paper. The result indicates that the efficiencies of the flexible rectenna with the two conductive non-woven fabrics are not so high as the rectenna with copper foil. We have to examine the characteristics of the conductive non-woven fabrics as microwave transmission lines for the design of the rectenna.