Structure and radiophysical properties of ferrite-based materials, designed for ultrawideband systems

The paper presents some results of studies of radioabsorbing materials of meter and decimeter wavelength range on the basis of ferrites, as well as composite materials based on them. Some technology aspects of modified ferrites are given in account; the techniques of the determinations dispersion of the material parameters (complex permittivity and permeability) are discussed. Example of complex permeability of Ni-Zn, Mg-Zn ferrites in a frequency range from 1 MHz up to 8 GHz and electron microscopy investigations are presented.