Reverberation Chamber Measurement Correlation

Pirkl, Ryan J.; Remley, Kate A.; Patane, C. S. L.

doi:10.1109/temc.2011.2166964

Cited by 86 publications

(96 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This behavior of the CC results was also observed in the past, for the same chamber and the same stirrer configurations, analyzing the ratio between the maximum and the ensemble averaged field inside the chamber whose value is related, in a statistical sense, to the independent position number [35]. Similar results were observed in [36] with a different work methodology and higher frequency range. Figure 4 shows the effect produced by the number of field points used to build up the correlation matrix.…”

Section: Resultssupporting

confidence: 83%

“…These analyses highlighted the importance of the mechanical blades in the stirring process, suggesting a deep investigation of the geometrical parameters that affect stirrer performance [34]. The use of multiple blade systems can enhance stirring efficiency but it depends on the way they are moved [35,36], and new stirrer shapes that enhance its performance are obtained by FDTD simulations [37]. One of the main parameters used to check stirrer efficiency is the number of statistical independent positions assured during blade rotation.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the proposed approach is based on the calculation of the correlation matrix for the magnitude of the electric field computed by FDTD code in a grid of N w spatial points, selected among an arbitrary volume of the chamber. Another recent application of the correlation matrix to evaluated stirrer efficiency was applied to RC measurements based on a single point, adopting different frequency points to populate the matrix and investigating different chamber loading conditions [36]. Figure 1 shows the RC geometry used for both simulations and measurements: dimensions are 6.00 × 4.00 × 2.50 m 3 .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reverberation Chamber as a Multivariate Process: FDTD Evaluation of Correlation Matrix and Independent Positions

Gradoni

Primiani²,

Moglie³

2013

PIER

View full text Add to dashboard Cite

Abstract-This paper evaluates the mode-stirring efficiency in terms of uncorrelated positions of a mechanical stirrer operating inside a reverberation chamber (RC). The actual RC is simulated and viewed as a multivariate random process: the chamber field is sampled in a lattice of spatial points distributed uniformly over a volume of arbitrary dimensions. By adopting such a grid, the stirrer efficiency is then computed through the correlation matrix, accounting for the residual correlation between stirrer positions. The second-order statistics are calculated averaging over the sampling volume. Results are presented for two stirrers that move in both synchronous and interleaved mode. A comparison with the traditional circular correlation (CC) method, for the determination of the uncorrelated positions, is done showing how CC overestimates stirrer efficiency.

show abstract

Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reverberation Chamber as a Multivariate Process: FDTD Evaluation of Correlation Matrix and Independent Positions

Gradoni

Primiani²,

Moglie³

2013

PIER

View full text Add to dashboard Cite

show abstract

“…The diversity measure is simply the number of independent antennas. Actually, it has been used for estimating independent sample number in RC measurements [18][19][20].…”

Section: Diversity Measurementioning

confidence: 99%

Antenna Correlation and Its Impact on Multi-Antenna System

Chen¹

2015

PIER B

View full text Add to dashboard Cite

Abstract-It is generally believed that antenna correlations of up to 0.5 in magnitude have negligible effects on the performance of multi-antenna systems, and that antenna correlation only affects the system performance via its magnitude. In this paper, we show that antenna correlations of 0.5 in magnitude that has negligible effect in capacity (i.e., theoretically maximum data rate) can cause noticeable degradation on the throughput (i.e., actual achievable data rate); and that, when the number of antennas is larger than two, the phase of the correlation also has an impact on the performance of multi-antenna system. We demonstrated these via simulations and measurements in a reverberation chamber.

show abstract

“…The Rényi information entropy ( ) has been used in the analysis of reverberation chamber measurements in [23]. can be evaluated for each time instant from the correlation of some sets of field values, obtained changing the stirrer position.…”

Section: Introductionmentioning

confidence: 99%

Reverberation chamber as a statistical relaxation process: Entropy analysis and fast time domain simulations

Gradoni

Primiani

Moglie

2012

International Symposium on Electromagnetic Compatibility - EMC EUROPE

View full text Add to dashboard Cite

In this contribution, we investigate the entropy growth in a mode-stirred cavity simulated by the FDTD method. The adopted reverberation chamber is efficiently stirred by multiple paddles and excited by a Gaussian pulse. It is observed that the entropy starts growing quadratically in time, then it increases linearly during the energy buildup, and it saturates after a few nanoseconds, when the full onset of chaotic regime is developed. This allows for terminating the numerical simulations well before the Richardson time, as the asymptotic entropy is rapidly achieved. The analysis is based on the eigenvalues of the correlation matrix, calculated over a dense grid of spatial points, thus supporting the perspective of the reverberation chamber as a statistical multivariate process. The number of orthogonal eigenvectors (principal components) can be estimated and used as the number of statistically independent stirrer positions (degrees of freedom, cavity realizations). It is found that letting the chamber evolve for a very long time would gain only a few principal components, thus adding a negligible improvement in the stirring performances. Different mode-stirrer shapes can be investigated and their efficiency quantified by this method.

show abstract

Reverberation Chamber Measurement Correlation

Cited by 86 publications

References 34 publications

Reverberation Chamber as a Multivariate Process: FDTD Evaluation of Correlation Matrix and Independent Positions

Reverberation Chamber as a Multivariate Process: FDTD Evaluation of Correlation Matrix and Independent Positions

Antenna Correlation and Its Impact on Multi-Antenna System

Reverberation chamber as a statistical relaxation process: Entropy analysis and fast time domain simulations

Contact Info

Product

Resources

About