Preparation of λ/4 Type Absorber of Flyash in S-band for the EM-pollute Protection

On the basis of λ/4 type, by means of theory design and simulation analysis, a new flyash absorber was prepared by assembling resistive film with dielectric board of flyash in this paper.Resultsshow that absorber with a thickness of 1.5 cm and a resistance of 356 Ω/□ has the minimum reflectivity of-25 dB in 2.9 GHz, and in the band of 2~4 GHz, the range of absorbing over-10 dB can achieve 60%.This new material can be used in the electromagnetic pollute protection of indoor upholster.