Comparison of Site Attenuation Analysis Results between FDTD and Ray-Tracing Method Using Compact Anechoic Chamber
Comparison of Site Attenuation Analysis Results between FDTD and Ray-Tracing Method Using Compact Anechoic Chamber
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FDTD 与紧凑型电波暗室射线追踪法现场衰减分析结果比较
DOI：
10.1093/ietcom/e88-b.8.3152
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
N. Kuwabara
中科院分区：
文献类型：
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作者：
M. Kawabata;Yasuhiro Ishida;K. Shimada;N. Kuwabara
场地衰减是评价电波暗室的重要参数。应用射线追踪法对其进行了分析。然而，适用的最低频率尚未清除。本文用FDTD方法分析了紧凑型电波暗室从30 MHz到250 MHz的场地衰减，并与射线追踪法的计算结果进行了比较，以确定射线追踪法可以应用的最低频率。计算中使用了紧凑型消声室，吸声体放置在所有的墙壁上。对于FDTD分析，采用了尺寸大于天线单元直径的大单元来模拟偶极子天线和吸振体。为了验证，对紧凑型电波暗室的场地衰减进行了测量，并与FDTD法和射线追踪法的计算值进行了比较。结果表明，当频率小于180 MHz时，射线跟踪法的计算值比FDTD法的计算值有较大的偏差。
The site attenuation is an important parameter to evaluate an anechoic chamber. The ray-tracing method has been applied to analyze it. However, the lowest applicable frequency has not been cleared. In this paper, the FDTD method has been applied to analyze the site attenuation of a compact anechoic chamber from 30 MHz to 250 MHz, and this has been compared with the calculated one by the ray-tracing method to evaluate the lowest frequency where the ray-tracing method could be applied. The compact anechoic chamber, where the absorbers are placed on the all walls, has been used for the calculation. For FDTD analysis, the dipole antenna and the absorber have been modeled by using the large cell, whose size is larger than the diameter of the antenna element. For verification, the site attenuation of a compact anechoic chamber has been measured and compared with the calculated values by the FDTD method and the ray-tracing method. As the results, the calculated values by the ray-tracing method have larger deviation than the ones by the FDTD method when the frequency is less than 180MHz.