无线电吸波暗室的反射电平（下）

给出了天线方向图比较法和自由空间电压驻波比法两者的对照,这2种方法可用于评估无线电吸波暗室的反射电平。在分析这2种方法之后,指出了哪些参数会影响反射电平的测量值。通过实验结果的对照,揭示了为什么在采用这2种方法时会得到不尽一致和不相关联的结果,进而还表明当吸波暗室性能获得改进之后,如何利用反射电平来衡量这种改进。基于目前的研究成果,描述了吸波暗室性能的评估步骤。同时,还通过举例指出有必要开展进一步的研究,以便归纳出满意的评估步骤。

Reflectivity Level of Radio Anechoic Chambers

A comparison between the antenna-pattern comparison technique and the free-space voltage standing-wave ratio technique for evaluating the reflectivity level of radio anechoic chambers is presented. Based on an analysis of the two techniques, it is pointed out which parameters infl uence the measured value of the refl ectivity level. The comparison is illustrated with experimental results and it is explained why inconsistent and uncorrelated results may be found when the two methods are used. Furthermore, it is demonstrated, by introducing improvements in a chamber, how the refl ectivity level can be used to measure the improvements. This work is inspired by the current discussion of fi nding a fi gure of merit for anechoic chambers. Based on the results, an evaluation procedure for anechoic chambers is indicated. However, it is pointed out and illustrated by examples that further investigations are necessary before a satisfactory procedure can be outlined.