Silicon carbide fibers were coated with iron (Fe) via the chemical vapor deposition (CVD) method. No obvious changes were observed for the silicon carbide fibers' tension while the coating process continued, but the strength of the iron-coated fiber declined accordingly as a result of the increased diameter. The resistivity decreased greatly. The dielectric constant of the iron-coated fibers could be adjusted in a wide range under different process conditions. Magnetic loss was introduced due to the inherent property of the iron. The dielectric constant and magnetic permeability could be improved under lower depositing temperature and higher flow rate of carrier gas.