Electromagnetic theory of reverberation chambers

Hill, David A.

doi:10.6028/nist.tn.1506

Cited by 188 publications

(120 citation statements)

References 30 publications

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“…accounts for power leaked by a perfectly matched and lossless antenna, expressed as a quality factor [1]; V λ = V /λ 3 is the electric volume of the RC, with λ the wavelength. Eq.…”

Section: Power Transmission Through An Rcmentioning

confidence: 99%

“…But antennas do not simply behave as gateways: they may introduce their own power dissipation mechanism, measured by their radiation efficiency η a . These observations also apply to any receiver or EUT [1].…”

Section: Introductionmentioning

confidence: 99%

“…The standard model available for predicting antenna-related losses was derived in [1]. Its main drawback is that it regards as lost only the power dissipated onto antenna loads, a description here argued to hold only for lossless antennas.…”

Section: Introductionmentioning

confidence: 99%

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Power Loss in Reverberation Chambers by Antennas and Receivers

Cozza

2018

IEEE Trans. Electromagn. Compat.

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Abstract-Antennas, and more generally any equipment under test (EUT) capable of coupling to impinging electromagnetic waves, are well-known sources of power loss in reverberation chambers (RCs). As such, it is fundamental to model their contribution to an RC quality factor. The standard model available in the literature is based on power dissipated in loads connected to an antenna. This paper argues about the inaccuracy of this description, where internal dissipation within an antenna (or EUT), associated to low radiation efficiencies, is neglected. An alternative model is validated by showing its selfconsistency in predicting change in loading effects as opposed to the standard model. It is expected to have practical importance for tests performed in the low-frequency range of RCs, where antenna-related dissipation is the dominant loss mechanism, and in particular for EUTs which can be expected to display poor radiation efficiencies.

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“…accounts for power leaked by a perfectly matched and lossless antenna, expressed as a quality factor [1]; V λ = V /λ 3 is the electric volume of the RC, with λ the wavelength. Eq.…”

Section: Power Transmission Through An Rcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Power Loss in Reverberation Chambers by Antennas and Receivers

Cozza

2018

IEEE Trans. Electromagn. Compat.

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“…For both OATS and ACS, it is difficult to generate high E-field strength without using an amplifier at high frequency. In contrary, a reverberation chamber (RC) is considered as an alternative to an OATS and an ACS for EMC test due to advantages of reasonable building, maintenance cost, and high E-field strength (100 V/m with only 1 W) [2,3].…”

Section: Introductionmentioning

confidence: 99%

Research on a guideline of stirrer installation in reverberation chamber

Kim

Jang

Yang

2014

IEICE Electron. Express

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This paper presents a guideline for determining an adequate position and orientation of a stirrer. A stirrer is used to improve a uniform electric field on a working volume inside a reverberation chamber (RC). An efficient stirrer is expected to change boundary conditions and field characteristics such as magnitude and direction, so as to improve the uniform electric field. To determine an adequate installation location of a stirrer, we have analyzed efficiency of two kinds of stirrers with different shapes, and measured field uniformities. Efficiency of each stirrer has been investigated in terms of the number of independent samples that the stirrers can provide, and E field strengths and powers in the working volume measured in order to investigate the field uniformity. Measurement results show that the field uniformity and the stirrer efficiency are deteriorated by STD 0.8 dB and 20% point, respectively, when the stirrer is located less than λ LUF /4 close to any chamber wall and in a parallel orientation with the wall. Hence, it is recommended that a stirrer should be installed in a position > λ LUF for the field uniformity and < 2λ LUF for a large working volume, and in an orientation to avoid a parallel angle with the ceiling or any wall.

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“…RCs are electrically large, high Qcavities that generate statistically uniform fields by either mechanical stirrers or frequency stirring [8]. RCs have been well studied theoretically and experimentally [9,10]. The concept of statistical electromagnetics and reverberation chamber have been applied to many applications characterized by having large cavities with a complex environment [11,12].…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis of Electromagnetic Field Inside a Jet Engine Using the Reverberation Chamber Approach

Abdelaziz

Trinchero²,

Khattab³

2012

PIER M

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Abstract-In this paper, the electromagnetic field distribution inside a jet engine is studied through full wave analysis. Results are statistically analyzed by comparisons to the models used for the reverberation chamber with a mechanical mode stirrer. The jet engine is simulated as an open cylinder containing one set of rotating blades by using 'Ansys R HFSS'. A simple Hertzian dipole illuminates the interior structure as an incident wave excitation representing a transmitting antenna radiating continuous wave fields. The field distribution inside the engine, which results from a distinct set of rotating positions of the blades, is primarily studied through the simulation program. In our case, the mechanical stirrer is represented by the rotating set of blades. The field values are extracted at different planes along the cylindrical engine, and the average field is statistically analyzed. We show that the squared magnitude of the field component along the engine's main axis has an exponential distribution compared to the theoretical exponential distribution proved in a reverberation chamber. This approach promises to act as a novel effective method to analyze the engine system without dealing with the complex details inside the engine cavity.

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Electromagnetic theory of reverberation chambers

Cited by 188 publications

References 30 publications

Power Loss in Reverberation Chambers by Antennas and Receivers

Power Loss in Reverberation Chambers by Antennas and Receivers

Research on a guideline of stirrer installation in reverberation chamber

Statistical Analysis of Electromagnetic Field Inside a Jet Engine Using the Reverberation Chamber Approach

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