Determining the lowest usable frequency of a frequency-stirred reverberation chamber using modal density

Fall, Abdou Khadir; Besnier, Philippe; Lemoine, Christophe; Sauleau, Ronan

doi:10.1109/emceurope.2014.6930914

Cited by 10 publications

(6 citation statements)

References 9 publications

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“…The computed standard deviation of E-field components is compared with the IEC standard defined limit to determine the LUF of the RRA RC. 11 The comparison of the simulated and measured results of field uniformity results show good agreement. The rest of the manuscript is arranged as follows: Section 2 discusses the limitations of the LUF calculations using modal density approach.…”

Section: Introductionmentioning

confidence: 61%

“…2,4,5,8 The EMI/EMC testing of a DUT or performing any other kind of testing in RC such as antenna radiation efficiency measurements 9,10 demands the accurate determination of the LUF of the chamber. 1,2,4 The LUF of the chamber can be computed using modal density formulas 3,11 or through the field uniformity analysis of RC internal generated EM fields. The former approach is based on the theoretical cavity modal density calculations, and it is used for the rough approximation of the LUF.…”

Section: Introductionmentioning

confidence: 99%

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Design, analysis, and validation of Radio Research Agency reverberation chamber

Yousaf

Lee

Faisal

et al. 2020

Int J Communication

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Summary This study presents the electromagnetic (EM) field uniformity analysis of the Korean National Radio Research Agency (RRA) reverberation chamber (RC). The analysis is performed using the normative procedure of International Electrotechnical Commission (IEC) 61000‐4‐21 for the estimation of the lowest usable frequency (LUF) of the RRA RC based on the field uniformity characterization. A full‐wave EM model of the RRA RC is designed using the method‐of‐moments (MOM) technique. The triaxial electric fields at the eight corners of the defined working volume are measured using electric field probes for the complete revolution of the mechanical stirrer. The experimental data are obtained for the frequency range of 80–1,000 MHz through the designed data acquisition software. The post‐processing of the experimental and simulation data in terms of calculation of standard deviation of recorded E‐field data, and its comparison with the defined standard deviation limit in IEC 61000‐4‐21 standard is performed to obtain the LUF of the RRA RC. A good degree of agreement was observed between the simulated and measured results of the RC field uniformity.

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Section: Introductionmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Design, analysis, and validation of Radio Research Agency reverberation chamber

Yousaf

Lee

Faisal

et al. 2020

Int J Communication

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“…It should be pointed out that to the CST simulation and measurements, we show the power density at the center frequency, which is 5.5GHz. Because the first resonant frequency of the enclosure is 700MHz and as a rule of thumb, the lowest usable frequency of an enclosure is three times the first resonant frequency [14]. Therefore at 5.5GHz we assume a diffuse field has been established.…”

Section: Resultsmentioning

confidence: 99%

“…It should be pointed out that the field in the vicinity of the point source can not be considered diffuse, so in the final results they should be discarded. When the energy density is obtained, the power density in the enclosure is (14) The FreeFEM++ simulation finished in only a few seconds on a desktop computer ( Intel Core i7-870 @ 2.93GHz, 8GB RAM).…”

Section: The Energy Densitymentioning

confidence: 99%

Estimating Reverberant Electromagnetic Fields in Populated Enclosures by Using the Diffusion Model

Yan

Dawson

Marvin

2018

2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity (EMC, SI &Amp; PI)

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The ability of an enclosure to protect its contents from electromagnetic interference is quantified by its shielding effectiveness. Previous research has proved that the contents of an enclosure may greatly change the internal field and thus the shielding effectiveness. The power balance method is an efficient approach to analyze shielding problems of populated enclosures. One assumption of the power balance method is that in the steady state, the electromagnetic field in an enclosure is homogeneous. In actual circumstances, however, the presence of losses in an enclosure often compromises the field homogeneity and the power balance method may become inaccurate. A diffusion equation approach has been previously proposed to overcome this problem. In this paper, we predict the internal electromagnetic field of a populated enclosure by using the diffusion model, and compare them with the fields obtained by the power balance method, a fullwave electromagnetic solver and measurements, to demonstrate its efficacy. Comparisons between the diffusion model and the power balance method show that for populated enclosures, the internal electromagnetic field varies with position and that the diffusion model allows this to be observed.

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“…It shows that the f LU F IEC did not accurately predict the over-moded condition of RC as the statistical field uniformity and isotropy of the RC is not exactly achieved at f LU F IEC , but rather at little higher than the f LU F IEC due to the associated losses and inherent uncertainties of RC. These losses affect the statistics of the EM field and overmoded condition in RC [40], [53], [54]. Table 6 summarizes the reviewed techniques for the rapid indirect characterization of an RC.…”

Section: A Statistical Tests For Rc Field Analysismentioning

confidence: 99%