Abstract
The electromagnetic properties of Y-type hexagonal ferrite were studied to apply it to the electromagnetic wave absorbers in the GHz band. The sintered bodies having various chemical compositions were prepared, and both the complex relative-permeability and complex relative-permittivity were measured in the frequency range of 45MHz to 20GHz. The return loss was simulated with those experimental values for the metal-backed single-layer model. Moreover, a ferrite-rubber composite absorber was fabricated with Ni2Y-type ferrite. The simulated return loss curve agreed closely with that observed experimentally. The absorber showed the matching frequency, matching thickness and -20dB absorber bandwidth being 6.7GHz, 3.71mm and 2.1GHz, respectively. It was found that Y-type ferrite was a promising material for the absorber in the GHz band.
