Abstract: In order to investigate the electrical performance of basalt fiber, some tentative research was made in this paper. The results show that the dielectric constant of basalt fiber is less than other fibers such as E-glass fiber, S-glass fiber, D-glass fiber, quartz fiber and Kevlar fiber, etc. But the dielectric loss is a little bit higher even though the results were of the same order of magnitude. The wave absorption properties of basalt fiber cloth and mat are also measured. According to the results, these basalt fiber fabrics show good wave permeability in frequency range of 2~18 GHz. The CBF-EP composite laminate were prepared through a vacuuming procedure and measured by arch method. The results indicate that the CBF-EP composite laminate exhibits excellent characteristic in wave permeability in frequency range of 2~18 GHz. The reflection losses of all the above basalt fiber products are less than 10 dB, but the absorbing performance is not positively related to the thickness for the reasons of spatial distribution of the material.

Key words: basalt fiber, permittivity, composite materials, wave permeability