磁性材料及器件
磁性材料及器件
자성재료급기건
JOURNAL OF MAGNETIC MATERIALS AND DEVICES
2013年
1期
16-19
,共4页
吸波材料%蜂窝结构%均质化%等效介电常数%等效磁导率%反射率
吸波材料%蜂窩結構%均質化%等效介電常數%等效磁導率%反射率
흡파재료%봉와결구%균질화%등효개전상수%등효자도솔%반사솔
absorbing material%honeycomb-structure%homogenization%equivalent permittivity%equivalent permeability%reflection coefficient
为简化计算,在分析蜂窝周期结构电磁场问题时用到一个叫做“均质化”的方法,通过均质化理论推导出蜂窝吸波材料等效电磁参数的近似计算公式.这些表达式可用来计算具有几何周期结构的蜂窝材料的等效介电常数、磁导率以及反射系数.计算结果表明,蜂窝结构的等效介电常数和等效磁导率均小于基体材料的介电常数和磁导率.对于轴向厚度(区别于蜂窝壁厚度)不同的蜂窝材料,存在一个最优的基体材料占空比值,使得吸收层整体的反射率最小,这些结果对于蜂窝结构的设计具有一定意义.
為簡化計算,在分析蜂窩週期結構電磁場問題時用到一箇叫做“均質化”的方法,通過均質化理論推導齣蜂窩吸波材料等效電磁參數的近似計算公式.這些錶達式可用來計算具有幾何週期結構的蜂窩材料的等效介電常數、磁導率以及反射繫數.計算結果錶明,蜂窩結構的等效介電常數和等效磁導率均小于基體材料的介電常數和磁導率.對于軸嚮厚度(區彆于蜂窩壁厚度)不同的蜂窩材料,存在一箇最優的基體材料佔空比值,使得吸收層整體的反射率最小,這些結果對于蜂窩結構的設計具有一定意義.
위간화계산,재분석봉와주기결구전자장문제시용도일개규주“균질화”적방법,통과균질화이론추도출봉와흡파재료등효전자삼수적근사계산공식.저사표체식가용래계산구유궤하주기결구적봉와재료적등효개전상수、자도솔이급반사계수.계산결과표명,봉와결구적등효개전상수화등효자도솔균소우기체재료적개전상수화자도솔.대우축향후도(구별우봉와벽후도)불동적봉와재료,존재일개최우적기체재료점공비치,사득흡수층정체적반사솔최소,저사결과대우봉와결구적설계구유일정의의.
In order to simplify the calculation, a method called"homogenization"is used in the analysis of the electromagnetic field problems of honeycomb structures. Closed-form computing formulas for the equivalent electromagnetic parameters of honeycomb absorbing materials are obtained by theoretical derivation of homogenization. These expressions can be used to efficiently calculate the equivalent permittivity, permeability and reflection coefficient of honeycomb materials with periodic structures. It is pointed out that the equivalent permittivity and permeability of honeycomb-structure are smaller than those of the matrix material. The absorbing layer should have an optimum duty cycle value of the matrix material to make the reflectivity minimal for honeycomb materials with different axial thickness. These results are of some significance for design of honeycomb structures.
