Study of the anisotropy of microwave electromagnetic parameters of polycrystalline iron fiber absorber

Based on Maxwell equations, the theoretical formulas of microwave electroma gnetic parameters of polycrystalline iron fiber absorber are derived. The a nisotropy of microwave electromagnetic parameters of polycrystalline iron f iber absorber is explained by use of numerical calculations. Some samples o f fiber orientation have been produced and their electromagnetic parameters have been tested, the results confirm the anisotropy of electromagnetic pa rameters. Both of the theoretical and experimental results demonstrate that the axial permeability of polycrystalline iron fiber is greater than its r adial permeability, and the axial permittivity of polycrystalline iron fibe r is greater than its radial permittivity.