羰基铁和FeSiAl共混制备宽频吸波材料

Preparation of radar absorbing materials with broad bandwidth by mixing carbonyl iron and FeSiAl particles

为提高材料在低频段(1～4GHz)下的吸波性能和拓宽吸波频带,选择羰基铁和FeSiAl颗粒作为吸收剂、石蜡作为粘结剂制作吸波材料,采用矢量网络分析仪测试材料的电磁参数,并在给定厚度(0.5和1mm)下分析吸波材料的吸波性能。随着质量添加比的增加,两类材料的介电常数和磁导率均升高,添加比相同下含FeSiAl颗粒吸波材料在1mm厚时具有优异的低频吸波性能(-8.6～-1.2dB),而高频段(14～18GHz)时不及羰基铁(-16.0～-10.1dB);两类颗粒共混后,通过改变FeSiAl颗粒的含量能获得具有良好低频吸收性能(-4.5～-1.1dB)和宽频带(<-4dB频带为3.8～18GHz)的吸波材料。该结果对于通过混合其它优良低频和高频吸波材料以获取宽频带的吸波材料具有指导意义。

In order to increase the absorbing ability in the lower band（1-4GHz） and expand the absorbing band width, carbonyl iron and FeSiA1 particles were established as absorbers, and wax as adhesive, and the electro- magnetic parameters were tested by using a vector network analyzer, then the absorbing properties were calcu lated with a given thickness（0.5 or lmm）. The results showed that both the complex permittivity and permea bility increase as the ratio of quality increase. And under the same ratio of quality, FeSiA1 particles has excel- lent absorbing properties in low frequency band（-6.8～-1.2dB）, while inferior to carbonyl iron（-16.0 10.1 dB） in high frequency band（14-18GHz）. After mixing the two types of particles, the content of FeSiA1 particles is adjusted, and a composite absorbers with good absorbing properties in low frequency band（-4.5 ～-1.1 dB） and wide absorbing bandwidth（less than -4 dB in 3.8-18GHz） is found. It has an instructive value to mix other excellent low frequency absorbers and high frequency absorbers to get materials in a wide absorbing band