Equalização do desvio padrão do campo elétrico em uma câmara de reverberação compacta.

Abstract

A reverberation chamber is a test environment used to evaluate the electromagnetic compatibility of electronic equipment. Inside the Reverb chamber there is a volume called the uniform field zone where the equipment under test is positioned. In this volume the value of the standard deviation of the electric field can not exceed 3 dB. The position of the equipment under test may raise the standard deviation of the electric field within the uniform field zone. In this sense, it is important to verify, equalize and reduce the values of the electric field component standard. The standard deviation can be used as a performance metric, but to evaluate the performance of the reverberation chamber and the stirrers it is necessary to choose a set of metrics that can characterize different aspects of the electric field without interior of the chamber, allowing to investigate a convergence of the results. Each performance metric is obtained by measuring the electric field at one or more vertices of the uniform field zone. In this work, we used a set of performance metrics more common in the literature as: coefficient of anisotropy, coefficient of non-homogeneity, standard pattern and quality factor. The results were obtained in the range of 700 MHz to 3 GHz, allowing to prove that the reduction of the working area, the introduction of roughness and the use of opening angles in the blades of the agitator contribute to the increase of the operating range (in 150 MHz) of the reverberation chamber, reduction and equalization of the standard deviation (from 1.35 GHz to 3 GHz) within the uniform field zone, allowing the equipment under test to be tested regardless of its position.