混响室中天线复合q因子的各种估计

P. Besnier, C. Lemoine, J. Sol
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引用次数: 36

摘要

本文讨论了混响室中使用一根或两根天线(可能是一组天线)估计复合q因子的问题。文献中提供的大多数q因子估计都是基于在接收天线的末端捕获的电力的集合平均估计,电磁场与另一个天线一起产生。我们首先强调,使用两个天线和一个矢量网络分析仪,三种不同的估计是可能的,它们在实验中发现几乎是等效的。其次,去除一个天线,q因子可能主要在天线的q系数不再可以忽略的频率范围内变化。此外,对这两种类型的测量进行后处理可以单独提取该q系数的估计。与基于理想随机场假设的理论估计相比,这种估计是相当有利的。
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Various estimations of composite Q-factor with antennas in a reverberation chamber
This paper deals with the estimation of the composite Q-factor in a reverberation chamber using one or two antennas (possibly a set of them). Most of Q-factor estimations provided in literature are based on the estimation of the ensemble average of the electric power captured at the terminal of a receiving antenna, the EM field being produced with another one. We first highlight that using two antennas and a vector network analyzer, three different estimations are possible and they are found experimentally to be almost equivalent. Second, removing one antenna the Q-factor may change mainly in the frequency range for which the Q-coefficient of an antenna is no more negligible. Furthermore a post-processing of these two types of measurements allows to extract an estimation of this Q-coefficient alone. This estimation is quite favorably compared to its theoretical estimation based on ideal random field hypothesis.
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