含随机分布散射颗粒的吸波体设计和性能分析  

Design and wave absorption properties of a slab containing randomly distributed discrete macro-inclusions

作　　者：段玉平[1] 刘顺华[1] 王桂芹[1] 管洪涛[1] 

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《大连理工大学学报》2006年第6期823-827,共5页Journal of Dalian University of Technology

摘　　要：单层致密平板吸波材料除几个特殊的吸收峰外，很难在较宽的频段达到理想的吸收效果．通过在吸波体内导电媒质的“孤岛”化设计，制备了单层非连续体平板吸波材料．测试结果表明，在8～18GHz频段内，热压平板媒质只出现两个特征吸收峰值，含炭20％吸收效果最好，但超过10dB的有效频段只有约1GHz．而非连续体平板吸波材料由于和空间波阻抗的良好匹配以及内部“孤立”颗粒对电磁波的散射和吸收衰减，其反射损耗有较大提高；而且随着平板试样中“孤立”颗粒炭含量的增加，平板对电磁波的反射损耗也增加，当炭含量达到30％时，平板的反射损耗在8．5～18GHz宽频范围内都超过10dB，有效频段在10GHz以上．It is difficult for compact single-layer absorbers to exhibit a required absorptivity in broad wave band other than in some absorption peak. By isolating conductive medium in absorbing matrix, a single-layer absorber structure containing randomly distributed discrete macro-inclusions has been designed. The structure was specially designed so as to exhibit the optimum absorptivity at 8-18 GHz. The test results indicate that the reflection loss of compact sample only has two absorption peak and the effective wave band above 10 dB has only 1 GHz. But reflection loss of the slab absorbers containing discrete macro-inclusions was great, compared with that of compact sample because of good impedance matching, scattering and absorption losses of isolated conducting macro-inclusions. With the increasing carbon black content of discrete macro-inclusions in the slab absorber, the reflection loss of the sample increases in 8-18 GHz, and it is above 10 dB in 8.5-18 GHz when mass fraction of carbon black gets to 30%, so the effective wave band is about 10 GHz.

关 键 词：吸波 非连续 平板 孤岛 散射 

分 类 号：TB34[一般工业技术—材料科学与工程]