蜂窝结构吸波材料等效电磁参数的计算

THE CALCULATION OF EFFECTIVE ELECTROMAGNETIC PARAMETERS OF HONEYCOMB RADAR ABSORBING STRUCTURAL MATERIALS

用介质波导理论导出了蜂窝结构吸波材料的特征方程;数值计算了蜂窝结构中电磁波传播常数及其等效介电常数与等效磁导率。其主模的传播常数是介于芯与壁单质平面波的传播常数之间,等效电磁参数具有色散特性。

Honeycomb structural material is one of the valuable radar absorbing material? for the application of stealth technology. The calculation of effective electromagnetic parameters of lossy medium-filled honeycomb structure is essential to the electrical matching design of honeycomb structural materials. In this paper, the honeycomb structure is supposed to be the axi-symmetric dielectric rod arrays. The characteristic equation of lossy medium-filled honeycomb structure is derived with the dielectric waveguide theory and the consideration of coupling effects of the honeycomb arrays. The propagation properties and the propagation modes of electromagnetic wave in honeycomb arrays numerically ars analysed to find out the effective permittivity and the effective permeability of the lossy medium-filled honeycomb structure. The results indicate that the dominant mode propagation constant of the honeycomb structure takes the value between the propagation constant of plane wave of pure material^ of core and that of shell. The effective electromagnetic parameters of honeycomb structure present the dispersive effect, its effective permeability is larger and its effective permittivity is smaller, as expected for electrical matching design. With the lossy medium-filled honeycomb structural materials, the high performance proper ties of structural materials could be obtained through designing.