On the Measurable Range of Absorption Cross Section in a Reverberation Chamber

Flintoft, Ian D.; Bale, Simon J.; Parker, Simon B.; Marvin, A.C.; Dawson, J.F.; Robinson, M.P.

doi:10.1109/temc.2015.2499841

Cited by 23 publications

(15 citation statements)

References 16 publications

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“…These PCBs also show greater variation with frequency, particularly at lower frequencies when they also have a greater difference between themselves. Note that the measurement uncertainty is greater in the low frequency band, particularly from 2-3 GHz, due to a lower number of independent field samples and larger amount of nonstochastic energy in the chamber [15].…”

Section: Resultsmentioning

confidence: 99%

“…This size of chamber was necessary in order for the measurable range of the ACS to cover the expected range of the PCB ACSs [15]. The experimental setup is shown in Fig.…”

Section: Measurement Methodologymentioning

confidence: 99%

“…Since the total ACS is inversely related to the chamber power transfer function, the ACS of the object can be determined from [14] σ a PCB = The overall measurement procedure was validated using a collection of objects with known ACS [15]. The uncertainty in the ACS is estimated to be ±15%.…”

Section: Measurement Methodologymentioning

confidence: 99%

“…Average ACS is defined as the ratio of the average power absorbed to the average power density of the illuminating field. Such an average ACS can be measured in a reverberation chamber (RC) [14], [15]. The average ACS obtained from such measurements can be used directly in a power balance (PWB) analysis of the populated ICT enclosures in an external environment to provide an estimate of the level of shielding provided by the enclosure [16], [17].…”

Section: Introductionmentioning

confidence: 99%

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Measured Average Absorption Cross-Sections of Printed Circuit Boards from 2 to 20 GHz

Flintoft

Parker

Bale

et al. 2016

IEEE Trans. Electromagn. Compat.

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Absorption by the contents of an equipment enclosure, particularly printed circuit boards (PCBs), affect the enclosure's shielding performance. At high frequencies, this absorption can be quantified using the angle of arrival and polarization averaged absorption cross-section (ACS). However, there is no available data on the high-frequency absorption characteristics of modern PCBs. In this study, we apply a reverberation chamber to the determination of the average ACS of a large number of PCBs taken from contemporary information and communication technology (ICT) equipment to provide a unique and comprehensive dataset. The ACS was found to range from 4 × 10 −4 -10 −2 m 2 from 2-20 GHz and different classes of PCB could be identified according to their surface characteristics. The "shadowing effect" of densely packed PCBs was also quantified for a subset of the PCBs. It was found that the ACS of a PCB in the stack was reduced by 20%-40% compared to its value when isolated. By way of a review of the general power balance analysis of an electrically large populated equipment enclosure in an external environment, we show how the acquired data will be useful for future qualification methodologies for ICT enclosures and PCBs.

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Section: Resultsmentioning

confidence: 99%

“…This size of chamber was necessary in order for the measurable range of the ACS to cover the expected range of the PCB ACSs [15]. The experimental setup is shown in Fig.…”

Section: Measurement Methodologymentioning

confidence: 99%

Section: Measurement Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Measured Average Absorption Cross-Sections of Printed Circuit Boards from 2 to 20 GHz

Flintoft

Parker

Bale

et al. 2016

IEEE Trans. Electromagn. Compat.

Self Cite

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“…σ is the standard deviation of the ACS over a number of measurements with either different stirrer positions and/or over a range of frequencies. In[10], Flintoft et al include a model to calculate the uncertainty of ACS measurements in a reverberation chamber. Both (4) and the method in[10] led to similar uncertainty, which is about 20%.…”

mentioning

confidence: 99%

Effect of power state on absorption cross section of personal computer components: Applications to enclosure shielding

Yan

Dawson

Marvin

2017

2017 International Symposium on Electromagnetic Compatibility - EMC EUROPE

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Knowledge of the shielding effectiveness of an enclosure is important for the electromagnetic compatibility of electronic systems. The shielding effectiveness of an enclosure depends on the absorption cross section of its contents. It might be expected that the energy absorption in an electronic circuit changes according to the operating state of the semiconductor devices which compose the active components. In most published research, the absorption cross section measurements were performed when the contents were unpowered. In this paper we compare the measured absorption cross sections of the components of a personal computer in powered and unpowered states. Comparisons indicate that power and the particular operating configuration do not have a significant influence on the absorption cross section. This means that the process of determining absorption cross sections of circuit boards and other components can be easily achieved without the need to provide power and define a particular operating state.

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Discussion on Future Applications

2018

Anechoic and Reverberation Chambers

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On the Measurable Range of Absorption Cross Section in a Reverberation Chamber

Cited by 23 publications

References 16 publications

Measured Average Absorption Cross-Sections of Printed Circuit Boards from 2 to 20 GHz

Measured Average Absorption Cross-Sections of Printed Circuit Boards from 2 to 20 GHz

Effect of power state on absorption cross section of personal computer components: Applications to enclosure shielding

Discussion on Future Applications

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