The single layer absorber has the simplest structure among electromagnetic wave absorbers. To have thin and light materials with wide frequency characteristics for this structure, carbon and ferrite are mixed with rubber in different weight ratios. This new material has both dielectric and magnetic losses, which in a single layer structure, has good absorber characteristics . In the C-band, the relative bandwidth is up to 4.6 times wider, and the absorber is thinner, compared with nonmagnetic lossy dielectric material (i.e., 1.0, 0).