手征媒质反射特性仿真计算

手征媒质是双各向同性媒质的一种，其手征参数具有可调性。首先，在标准粒子群 算法(PSO)和模拟退火（SA）算法的基础上进行了改进，并利用混合算法优化设计手征参数 及媒质 厚度，以在给定的频率范围内获得较高的吸收率。然后，仿真计算了某一个参数取不同值而 其它参数固定情况下电磁波垂直入射到手征媒质时的反射系数。结果证明，只有在最优化参 数条件下才可以在频带内获得较理想的吸收率和反射系数。

Reflection Characteristics Simulation of Chiral Medium

Chiral medium belongs to bi isotropic medium, whose chiral parameter i s a controlled variable. Based on the standard particle swarm optimization (PSO) algorithm and simulated annealing (SA) algorithm, improved algorithms are propo sed . A hybrid optimization algorithm based on improved PSO and SA is applied to des ign the thickness and chiral parameter of chiral medium in the given frequency b and to achieve a better absorptivity. Then reflection coefficients are computed when one parameter is variable but the others are kept invariable. The resul ts illustrate that better absorptivity and reflection coefficient are gained bec ause of optimal parameters.