Reverberating chamber electromagnetic field in presence of an unstirred component

Corona, P.; Ferrara, Giuseppe; Migliaccio, M.

doi:10.1109/15.852404

Cited by 78 publications

(49 citation statements)

References 7 publications

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“…1. This is a common approach used to determine the statistical behavior of a multimode-stirred chamber [30]. The statistics of the measured -parameters are equivalent to the statistics of the field components [30].…”

Section: B Measurement Techniquementioning

confidence: 99%

“…This is a common approach used to determine the statistical behavior of a multimode-stirred chamber [30]. The statistics of the measured -parameters are equivalent to the statistics of the field components [30]. This should be no surprise, since a measurement between two antennas is essentially a measurement of the transfer function of a given radio propagation environment [31].…”

Section: B Measurement Techniquementioning

confidence: 99%

See 1 more Smart Citation

Evaluation of True Polarization Diversity for MIMO Systems

Valenzuela-Valdés¹,

Garcı́a-Fernández

Martinez-Gonzalez

et al. 2009

IEEE Trans. Antennas Propagat.

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Abstract-MIMO systems where multipath fading is only partially correlated could use polarization diversity to provide a higher diversity gain. Recent letters have proposed the use of tri-polarized antennas and a novel true polarization diversity (TPD) scheme. In this paper, the full potential of TPD is evaluated with both simulations and measurements and compared to conventional orthogonal polarization diversity (OPD). MIMO system performance with respect to capacity and diversity gain is obtained through the use of multimode-stirred chambers for both isotropic and non-isotropic environments. Simulated and measured results in over 591 different MIMO systems show that TPD outperforms conventional OPD for reduced volumes. Likewise, it has been demonstrated that TPD can be effectively combined with spatial diversity to nearly double the diversity gain and MIMO capacity for the same available handset volume.

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Section: B Measurement Techniquementioning

confidence: 99%

Section: B Measurement Techniquementioning

confidence: 99%

Evaluation of True Polarization Diversity for MIMO Systems

Valenzuela-Valdés¹,

Garcı́a-Fernández

Martinez-Gonzalez

et al. 2009

IEEE Trans. Antennas Propagat.

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show abstract

“…The plane wave integral representation and properties in a reverberation chamber are addressed in [3]. [4] presented a statistical electromagnetic theory when unstirred components of the electromagnetic field (EMF) are presented in the chamber. [5] described how to tune a reverberation chamber to emulate either a Rayleigh or a Rician channel, along with the probability density function of the EMF.…”

mentioning

confidence: 99%

Assessing Whole-Body Absorption Cross Section For Diffuse Exposure From Reverberation Chamber Measurements

Bamba

Gaillot

Tanghe

et al. 2015

IEEE Trans. Electromagn. Compat.

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Abstract-An original experimental protocol is developed to assess the whole-body absorption cross section of objects with arbitrary shapes and materials in diffuse fields at any operating frequency. This approach is important for dosimetry specifically in realistic environments wherein diffuse fields can be prominent. For this application, the knowledge of the whole-body specific absorption rate is critical and can be determined from the human whole-body absorption cross section. The whole-body absorption cross section is obtained from measurements performed in a stirred-mode reverberating chamber processed with the high-resolution parameter estimator RiMAX. To validate the proposed approach and highlight its robustness, the whole-body absorption cross section of a cylindrical phantom is experimentally and numerically determined at 1800 MHz. For both methods, the whole-body absorption cross section is shown to be independent on the orientation of the transceivers, indicating that it is indeed caused by diffuse fields. A good agreement is obtained between experimental and numerical Finite-Difference Time-Domain (FDTD) results with a relative deviation of about 17 %. From the validation of this approach, the measurement protocol is applied to a real human at 1800 MHz resulting in a whole-body absorption cross section of 0.95 m 2 , 1.01 m 2 and 1.11 m 2 for a sitting, standing, and standing with stretched arms posture, respectively.

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“…Excluding the existence of unconventional setup configurations where the excitation source is strongly coupled to the equipment under test (EUT) [8], experimental observations of local anomalies in field statistics, appearing as glitches, have been reported in several papers [9], [10], [11]: these phenomena, though partially tolerated in the current operation of MSRC [12], have not yet received a satisfying physical explanation. Anomalies of this kind usually imply statistical dispersions higher than expected for a diffuse field (perfect reverberation), taking the form of local deviations rather than systematic ones over a bandwidth: these are usually referred to as outliers [2], i.e., as samples not belonging to the reference law and suspected to indicate a problem of some sort in the setup.…”

Section: Introductionmentioning

confidence: 99%

Probability Distributions of Local Modal-Density Fluctuations in an Electromagnetic Cavity

Cozza

2012

IEEE Trans. Electromagn. Compat.

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Abstract-Results from random-matrix theory are applied to the modeling of random fluctuations in the modal density observed in an electrically large cavity. By starting from results describing the probability distribution of the modal spacing between adjacent frequencies of resonance, or nearest-neighbor spacing, we introduce a simple procedure allowing to pass from the modal spacing to the local modal density as measured over a finite bandwidth. This local definition of the modal density is more consistent with the physics of reverberation chambers, since it has been recently shown that the deviation from asymptotic statistics of field samples is dependent on the number of modes overlapping within a modal bandwidth. It is shown that as opposed to current interpretation, the number of overlapping modes is a strongly fluctuating quantity, and that estimating it by taking the frequency derivative of Weyl's formula can lead to non-negligible errors and misunderstandings. Regarding these fluctuations as second-order effects is therefore not sound from a physical point of view, since the existence of modal depleted scenarios can easily explain the appearance of local anomalies in the field statistics, particularly, but not exclusively, in the lower frequency range of operation of reverberation chambers.

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Reverberating chamber electromagnetic field in presence of an unstirred component

Cited by 78 publications

References 7 publications

Evaluation of True Polarization Diversity for MIMO Systems

Evaluation of True Polarization Diversity for MIMO Systems

Assessing Whole-Body Absorption Cross Section For Diffuse Exposure From Reverberation Chamber Measurements

Probability Distributions of Local Modal-Density Fluctuations in an Electromagnetic Cavity

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