Preparation and Microwave Electromagnetic Properties of Cross-shaped SiC Fibers

Cross-shaped SiC fibers were prepared from precursor polymer. The diameter of fiber’s circumcircle is about 34 μm, the length of vane is about 12μm, and the width of vane is 8μm. The complex permittivity and permeability of cross-shaped SiC fibers were measured by the coaxial line method at 2-18 GHz. The ε′, ε″, μ′, μ″ and tanδ of cross-shaped SiC fibers/paraffin wax composites are 2.77-7.93, 1.38-6.41, 0.96-1.12, -0.05-0.08, 0.49-0.81, respectively. Cross-shaped SiC fiber is a kind of dielectric loss materials. The reflection loss of the composites is below -10 dB at 9.12-18 GHz in the range of 2-18 GHz, and the minimum value is -28.47 dB at 12 GHz. The bandwidth corresponding to the reflection loss below -10 dB is 8.88 GHz.