【摘要】 应用广义匹配规律(GML)给出了多涂层吸波材料的功率反射率公式,定义了广义匹配规律的匹配常数M,并讨论了匹配常数M与功率反射率RP、百分比功率反射率RbP、涂层厚度d、相对介电常数εr、相对磁导率μr的关系.指出随着厚度d的增大,当M>1时,RbP开始时下降迅速,然后很快趋于0;当M<1时,RbP开始时下降迅速,随后出现振荡并随d的增大而趋于某一定值,但当M<1且介质和空气的阻抗完全匹配时,振荡消失;M=1时为临界情况.另外指出,在d很小且1≤μ′r≤4的要求下,要使RP有较大的分贝数,M应取大于1的值,而且发现优化ε″r对RP的提高并不明显,而优化μ″r则是主要的,这也证明了全貌分析方法提出的观点.更多还原

【Abstract】 The formula of power reflectivity has been developed for multilayer absorbing coatings using general matching law (GML). The constant of general matching law M is defined, and its relationship with power reflectivity RP, percentage power reflectivity RbP,thickness d, relative permittivity εr,relative permeability μr  is discussed. It was found that RbP descends quickly and approaches to zero with increasing thickness(d) at M>1; When M<1, RbP decreases rapidly at the beginning, and oscillates to constant with increasing thickness (d); When M<1 and at the impedance of medium match with aero entirely, the surges of RbP do not occur, the case of M=1 is the critical state. In addition, when 1≤μ′r ≤4 and the thickness (d) is very small, the value of M has to be larger than one if RP has large dB. It was also found that the enhancement of RP is not obvious owing to optimized ε″r, but optimized μ″r is primary. This is consistent with the panorama analysis method.更多还原