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研究了含有谐振子和损耗介质的环氧树脂基复合材料对电磁波的反射与吸收效应。对具有不同谐振子含量的复合材料的微波反射率测试结果表明:复合材料中谐振子的含量达到某一临界值 V_(fc)时,呈现对电磁波吸收至反射的转变效应,对于铁氧体填充的环氧树脂基复合材料,当铁氧体的体积含量为70%时,V_(fc)=0.4%,实验发现:V_(fc)依赖于材料的介电特性,复数介电常数虚部越小,V_(fc)越大,对于复数介电常数虚部很小的材料,由吸收向反射的转变是逐渐过渡的,V_(fc)存在一个较宽的范围。分析表明:当谐振子含量 V_f 增大时,出现吸收与反射转变效应,与体系的快极化电容增加以及谐振子感应场的相互作用增强有关。
The effects of the reflection and absorption of the electromagnetic waves on the epoxy matrix composites containing the harmonic oscillator and the lossy medium were studied. The results of microwave reflectivity tests on composite materials with different content of harmonic oscillator show that the transition effect from electromagnetic wave absorption to reflection appears when the content of the harmonic oscillator in the composite reaches a certain critical value V fc, Vfc = 0.4% when the volume fraction of ferrite is 70%. It is found that V fc depends on the dielectric properties of the material and the imaginary part of the complex dielectric constant Small, V_ (fc) the larger, for a small number of imaginary part of the dielectric constant is small, the transition from absorption to reflection is a gradual transition, V_ (fc) there is a wide range. It is shown that the absorption and reflection transition effect occurs when the content of harmonic oscillator V_f increases, which is related to the increase of the fast polarization capacitance of the system and the enhancement of the interaction of the resonator.