采用超声共混法制备CNTS/La2O3复合粉末,测试复合粉末在2～18 GHz波段的电磁参数,研究不同La2O3含量的CNTS/La2O3吸波材料的电磁特性.结果表明,随着La2O3含量的增加,CNTs/La2O3的复介电常数的实部和虚部逐渐增加,介电损耗增大,衰减常数逐渐增大,但是特征阻抗降低.根据电磁波传输线理论计算CNTS/La2O3吸波材料的反射率曲线,当厚为2.0 mm,未掺杂La2O3,质量分数为6％CNTs的反射率峰值为-18.1 dB.La2O3的质量分数为15％时,CNTs/La2O3具有最佳的吸波性能,反射率峰值为-31.6 dB,小于-5 dB和-10 dB的频带宽为2.98 GHz和6.3 GHz.
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