Characterizing the Electromagnetic Properties of Fiber Materials Using Effective Medium Technique
Yen-Ren Chen1*, Hsien-Wen Chao1, Tsun-Hsu Chang1
1Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
* Presenter:Yen-Ren Chen,
This work presents a method that can measure the complex permittivity and the conductivity of thin-and-long fiber materials. The extremely high aspect ratio of the fibers is difficult to characterize because of small sample volume. Here we introduce a teflon shell and randomly pack the fibers into the container with different volumetric percentages. The samples are placed in a resonant cavity with strong field enhancement. The resonant frequency and quality factor are measured using a network analyzer. By comparing with the simulation results of a full-wave sover, the conductivity and complex permittivity can be obtained for various volume fraction. The effective medium technique is then employed to calculate the effective electromagnetic properties of the pure fiber materials.

Keywords: fiber, dielectric property, enhanced field method, frequency response, effective medium theory