MICROWAVE POLYMER-FERROXIDE FILM ABSORBERS

The influence was studied of applying an external magnetic field on th e microstructure and on the microwave magnetic and dielectric properti es of thin-film absorbing structures containing two types of magnetic fillers. The frequency spectra between 7 and 17 GHz were obtained of t he complex magnetic permeability mu() and the complex dielectric perm ittivity epsilon(). A strong dependence was established of the compos ite's magnetic losses on the internal anisotropy field of the fillers. When the polymer containing a highly anisotropic filler was prepared in the presence of an external magnetic field, structural changes were observed that affected composite's dieIectric and magnetic properties .