Electromagnetic properties of polymer composites Li$_{0.33}$Fe$_{2.29}$Zn$_{0.21}$Mn$_{0.17}$O$_4$/P(VDF-TFE) in the frequency range 100–7000 MHz

The article describes electromagnetic and microwave properties of the polymer composite with the lithium spinel ferrite inclusion of composition Li$_{0.33}$Fe$_{2.29}$Zn$_{0.21}$Mn$_{0.17}$O$_4$ in the frequency range 100-7000 MHz. It is shown that samples with a mass fraction of ferrite 60, 80% have pronounced radio-absorbing properties, measured using the reflection coefficient on a metal plate (return losses). For a composite with 80% ferrite, the minimum return loss was -37.5 dB at 2.71 GHz with an absorption width at -10 dB of 3 GHz. High absorption characteristics are directly related to the use of ferroelectric polymer P(VDF-TFE) as a binder, which is expressed in the combined action of the absorption mechanisms of the magnetic and ferroelectric phases.