マイクロ波塗装化電波吸収体 : X-バンド・薄層広帯域電波吸収体の試作

抄録

Two kinds of double-layer absorbers according to the design method Proposed in a previous paper, have been tested. They consist of BaTiO_3 ceramics for the 1st layer and Paints of ferromagnetic materials for the 2nd layer. Absorption properties have been measured in a microwave anechoic Chamber by the use of the phase-interference method. The results obtained are summarized as follows : (1) paint absorber for 8.5GHz band,combined with BaTiO_3 Ceramics and Ni-zn ferrite. Ratio of its thick(ness to the central-wave*length is 1/50. The frequency band of reflection loss at 10dB is 650NHz. The weight is 3.3Kg/m^2. (2) paint absorber for 10GHz band,combined BaTiO_3 ceramics and Hn-Zn ferrite Ratio of its thickness to the central wave-length is 1/25. The frequency band of reflection loss at 10dB is very wide to be 2550MHz. The weight is 4.8Kg/m^2. Thus, by choosing appropriately a combination of the electrical constants of the layer materials wider-ranged frequency characteristics can be obtained comparared to the conventional single-layer absorbers.