混杂组元低频吸波阵列层板复合材料的吸波性能

采用电磁仿真运算的方法设计了方形和十字形混杂组元低频吸波阵列,采用模压工艺制备了基于混杂组元低频吸波阵列的吸波层板复合材料。研究了各单组元阵列本征吸波特性随单元结构变化的规律和混杂组元低频阵列本征吸收带的叠加效应。吸波性能测试结果表明,不同形状阵列单元的混杂可以有效拓宽阵列的本征吸收带宽,方形和十字形混杂组元阵列为双峰吸收阵列,吸收峰频率分别为3.1与4.5 GHz。混杂组元低频阵列的引入可以有效改善层板低频吸波性能,5 mm厚吸波阵列层板的反射率在2~6 GHz范围内-4.7 d B,6~16 GHz范围内-7 d B,阵列吸波层板的宽频吸波性能显著优于传统的阻抗渐变型吸波层板,阵列吸波层板力学性能与树脂基复合材料层板相当。

Microwave Absorbing Composites Based on Low-Frequency Electromagnetic Wave Absorbing Array With Multiple-Component

In this paper, an low-frequency microwave absorbing (LFMA) array with patch & cross multiple-component is designed by electromagnetic simulation, and the microwave absorbing composites (MAC) based on LFMA array is prepared by moulded pressing. The influence of component structure on changing of the intrinsic microwave absorbing properties is studied. The microwave absorbing performance measurement reveals that the intrinsic absorbing bandwidth can be broaden by utilizing multi-component array. Dual absorbing peak is found on multi-component array with patch & loop cell, the frequency of which is located at 3.1 GHz and 4.5 GHz, respectively. The low-frequency absorbing performance of MAC can be obviously improved by intoduction of LFMA array. The reflection coefficient of MAC in 5 mm thickness is lower than -4.7 dB in the frequency range of 2 to 6 GHz as well as lower than -7 dB in the frequency range of 6 to 16 GHz, which is remarkably improved compared with the traditional impedance gradation MAC.