Two-layer wave absorber composed of soft-magnetic and ferroelectric substances

The proposed electromagnetic-wave absorber is based on the fact that the high matching frequency of a carbonyl iron-loaded one-layer rubber wave absorber decreases as the thickness or permittivity of the ferroelectric substance layer in front of it increases. A proposed two-layer wave absorber with a 1.5-mm carbonyl iron-loaded rubber and 0.5-mm barium titanate system has a return loss of 29 dB at 0.9 GHz. The matching frequency can easily designed to any frequency in the quasi-microwave-band by controlling the thickness of ferroelectric substance layer. It is suitable for quasi-microwave-band application.