Polymer absorbers containing magnetic particles: Effect of polymer permittivity on wave absorption in the quasi-microwave band

The effect of polymer permittivity on wave absorption in the quasi-microwave band has been elucidated for polymer composites containing magnetic metal particles. Absorbers composed of these composites can be thin when their real permittivities are high and their imaginary parts are low. However, in general, for polymer composites the real part actually increases as the imaginary part increases in this band. This implies that in designing absorbers we must choose a polymer species on the crossing area of the real and imaginary parts of the permittivity. Furthermore, to obtain thin absorbers, we should choose a polymer species with high real permittivities and low imaginary parts.