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首页> 外文期刊>Antennas and Propagation, IEEE Transactions on >Characterization of Reverberation Chambers for OTA Measurements of Wireless Devices: Physical Formulations of Channel Matrix and New Uncertainty Formula
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Characterization of Reverberation Chambers for OTA Measurements of Wireless Devices: Physical Formulations of Channel Matrix and New Uncertainty Formula

机译：用于无线设备OTA测量的混响室的特性：通道矩阵的物理公式和新的不确定度公式

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The paper deals with reverberation chambers for over-the-air (OTA) testing of wireless devices for use in multipath. We present a formulation of the ${rm S}$-parameters of a reverberation chamber in terms of the free space ${rm S}$-parameters of the antennas, and the channel matrix in the way this is known from propagation literature. Thereby the physical relations between the chamber and real-life multipath environments are more easily explained. Thereafter we use the formulation to determine the uncertainty by which efficiency-related quantities can be measured in reverberation chamber. The final expression shows that the uncertainty is predominantly determined by the Rician ${rm K}$-factor in the reverberation chamber rather than by the number of excited modes, assumed by previous literature. We introduce an average Rician ${rm K}$-factor that is conveniently expressed in terms of the direct coupling between the transmitting and receiving antennas (corresponding to a line-of-sight contribution) and Hill's transmission formula (corresponding to a multipath or non-line-of-sight contribution). The uncertainty is expressed in terms of this average ${rm K}$-factor and geometrical mode stirring parameters, showing strong reduction by platform and polarization stirring. Finally the formulations are verified by measurements, and the new understanding of uncertainty is used to upgrade an existing reverberation chamber to better uncertainty.
机译：本文涉及用于多径无线设备的无线（OTA）测试的混响室。我们根据天线的自由空间$ {rm S} $参数，以混响室的$ {rm S} $参数，以及从传播文献中得知的信道矩阵的形式，提出了一个公式。因此，腔室和现实多径环境之间的物理关系更容易解释。此后，我们使用公式确定不确定性，通过该不确定性可以在混响室中测量与效率相关的量。最后的表达式表明，不确定性主要由混响室内的Rician $ {rm K} $系数决定，而不是由先前文献所假设的激发模数决定。我们介绍一个平均Rician $ {rm K} $因子，该因子可以方便地表示为发射和接收天线之间的直接耦合（对应于视线贡献）和Hill的传输公式（对应于多径或非视线贡献）。不确定性用该平均$ {rm K} $因子和几何模式搅拌参数表示，显示出平台和极化搅拌的强烈降低。最后，通过测量验证了配方，并使用对不确定性的新理解将现有混响室升级为更好的不确定性。

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