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对地闪放电参量的估算主要是利用雷电电磁场与电流的关系,通过一定的通道模型从观测到的电磁场数据来反演得到回击电流峰值等特征量。当观测距离远大于通道高度时,利用回击天线模型与随高度指数衰减的传输线电流模型(MTL)相结合得到远场近似公式;当观测距离较近时,利用“先导-回击模型”得到近场近似公式。并分别估算了回击电流峰值与回击中和的电荷量等放电参量,得到与实测数据相一致的结果.说明了近似公式的可靠性. 相似文献
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Summary The aim of this work is to examine the differences in power absorption in the brain of adults and children exposed to the
radiation of mobile phone terminals at 1710 MHz. To this end, simulations using the Finite-Difference Time-Domain (FDTD) method
have been carried out to study the interaction between heterogeneous anatomically correct models of the human head and a linear
or helical monopole mounted on the top of a metal box representing a realistic mobile communication terminal. The study includes
computations of specific absorption rates (SARs) inside the human head and the total power absorbed by the head. Emphasis
is placed on the comparative assessment of power absorption characteristics in heads of adults and children as well as on
the effect of various parameters such as the age-related changes in dielectric properties and the usage distance between the
user's head and the mobile terminal. 相似文献
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简要介绍了微带天线的优点和分形天线的基本概念及特性,设计了一种能够满足超宽带通信要求的、简化的矩形分形微带贴片天线.并利用电磁仿真软件CST,分别对采用两种不同迭代次数所设计天线的性能进行了仿真实验,通过对实验数据的分析,证实了所设计天线的有效性. 相似文献