Numerical Analysis of a New Location for the Working Volume Inside a Reverberation Chamber

2012 ◽  
Vol 54 (2) ◽  
pp. 238-245 ◽  
Author(s):  
Franco Moglie ◽  
Valter Mariani Primiani
Keyword(s):  
Numerical Analysis ◽  
Reverberation Chamber ◽  
Working Volume ◽  
New Location

scholarly journals Development and Validation of New Reverberation Chamber for Wireless Devices

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Dong-Uk Sim ◽  
Sang Il Kwak ◽  
Jong Hwa Kwon ◽  
Seong-Ook Park
Keyword(s):  
Standard Deviation ◽  
Electromagnetic Compatibility ◽  
Initial Structure ◽  
Wireless Devices ◽  
Reverberation Chamber ◽  
Working Volume ◽  
Wireless Terminal ◽  
Reasonable Approach ◽  
Measurement And Evaluation ◽  
Development And Validation

This paper proposes a reverberation chamber structure consisting of new reflectors and mode stirrers for electromagnetic compatibility and wireless terminal measurements. The key design considerations for them are determined through a reasonable approach to analyze the eigenmode for a reverberation chamber and the standard deviation of its working volume based on 3D simulation. The final designs are expected to improve the standard deviation performance of the initial structure of the reverberation chamber and provide a better mode stirring environment. The results measured in the fabricated chamber demonstrate that these predictions are clearly realized. The results satisfy the main requirements of this paper, which are defined in consideration of the specifications of commercial reverberation chamber products. Therefore, the reverberation chamber of this paper is expected to be useful for performance measurement and evaluation of commercial wireless terminals. To verify this logical approach to obtain a good design and its results, the results measured in the actual fabricated reverberation chamber are described along with analytical and computational results.

scholarly journals Maximum Working Volume Evaluation in a Non-Canonical Reverberation Chamber

2009 ◽  
Vol 45 (3) ◽  
pp. 1646-1649 ◽  
Author(s):  
S.L. Avila ◽  
M.A. Santos ◽  
D. Weinzierl ◽  
L. Krahenbuhl ◽  
R. Perrussel ◽  
...  
Keyword(s):  
Reverberation Chamber ◽  
Working Volume

New Location Model Based on Automatic Trimming and Smoothing Approaches

2018 ◽  
Vol 15 (2) ◽  
pp. 493-499 ◽  
Author(s):  
Hashibah Hamid
Keyword(s):  
Numerical Analysis ◽  
Location Model ◽  
Continuous Variables ◽  
Classification Problems ◽  
Binary Variables ◽  
Classification Approach ◽  
New Model ◽  
Model Based ◽  
New Location

Location Model is a classification approach that capable to deal with mixed binary and continuous variables at once. The binary variables create segmentation in the groups called cells whilst the continuous variables measure the differences between groups based on information inside the cells. It is important to note that location model is biased and even impossible to be constructed when involving some empty cells. Interestingly from previous studies, smoothing approach managed to remedy the effects of some empty cells. However, numerical analysis has demonstrated that the performances of the location model based on smoothing approach are good in most situations except if there are outliers in the sample. Thus, the presence of outliers has alarmed us to further investigating the performance of the location model. Therefore, in this paper, we develop a new methodology of location model producing new model called automatic trimmed location model through new estimators resulting from an integration of automatic trimming and smoothing approaches in addressing both issues of outliers and empty cells simultaneously. The results have confirmed that the new methodology developed as well as the new location model produced offer another potential tools to practitioners, which possible to be considered in classification problems when the data samples contain outliers and at the same time could resolve the crisis of some empty cells of the location model.

scholarly journals Distances between Rats in Reverberation Chambers Used for Large-Scale Experiments

2021 ◽  
Vol 21 (2) ◽  
pp. 148-152
Author(s):  
Sangbong Jeon ◽  
Wook Jang ◽  
Ae-Kyoung Lee ◽  
Hyung-Do Choi ◽  
Jeong-Ki Pack ◽  
...  
Keyword(s):  
Plane Wave ◽  
Large Scale ◽  
Specific Absorption Rate ◽  
Three Dimensional ◽  
Wave Exposure ◽  
Whole Body ◽  
Reverberation Chamber ◽  
Working Volume ◽  
Reverberation Chambers ◽  
Sar Analysis

We investigate the whole-body average specific absorption rate (WBA-SAR) of rats under various plane wave exposure characteristics, including different polarizations, incidence angles, distances between rats, and total number of rats. Unlike many other studies, we start our SAR analysis from one rat and expand it to 27 rats facing random directions in a three-dimensional area. In a one-rat analysis, we examine how the incidence direction and polarization affect the SAR of a single rat. Moreover, we look into how various incidence polarizations behave differently after they are transmited through a rat, the information of which is then used to analyze the effect of spacing among 27 randomly arranged rats. Next, we analyze the effect on spacing of the 27 rats deployed under a 52-plane-wave exposure, which is introduced to mimic a realistic reverberation chamber (RC) environment. We show the deviation in WBA-SAR according to the distance between rats, which provides guidelines for selecting the appropriate rat distance based on the number of animals and the exposure deviation within a limited working volume in an RC for large-scale experiments.

scholarly journals Optimization of the Measurement Technique for Emissions in Reverberation Chamber Using the Equivalence Principle

2021 ◽  
Vol 11 (16) ◽  
pp. 7696
Author(s):  
Alfredo De Leo ◽  
Graziano Cerri ◽  
Paola Russo ◽  
Valter Mariani Primiani
Keyword(s):  
Electric Field ◽  
Equivalence Principle ◽  
Current Version ◽  
Reverberation Chamber ◽  
Working Volume ◽  
Field Samples ◽  
Radiated Emissions ◽  
Equivalent Sources ◽  
Real Scenario ◽  
Space Conditions

This paper presents an optimization of a method to reconstruct the radiated emissions of an equipment under test by the measurement of the electric field samples collected on the walls of a reverberation chamber. This means that only the orthogonal component of the electric field is necessary to obtain the radiative behavior of the device in free space conditions. The use of the equivalence principle allows one to reduce the number of equivalent sources used to reconstruct the radiation of the device. In fact, in the previous version of the method, the sources are placed into the entirety of working volume of the reverberation chamber. In the current version of the method, only the surface surrounding the equipment under test is discretized. The analytical implementation of the method is proposed for a particular stirring action: the multiple monopole source stirring technique. This technique is based on an array of monopoles placed onto the walls of the cavity, and therefore no further hardware is needed for the reconstruction of the radiated emissions. The method is experimentally validated in a real scenario.

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