Aperture excitation of electrically large, lossy cavities

Hill, David A.; Ma, Mingyang; Ondrejka, Arthur; Riddle, Billy F.; Crawford, M. L.; Johnk, Robert T.

doi:10.1109/15.305461

Cited by 308 publications

(190 citation statements)

References 15 publications

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“…For a resonant aperture, there is no approximation of the transmission cross section σ TCS available. However, the circular aperture does not have strong resonances according to Hill et al (1994). Figure 1.…”

Section: The Quality Factor Qmentioning

confidence: 99%

“…In this paper, Q is extracted from the resonance behaviour in time domain, observing the decay of the field strength inside the shield. In the following, a short introduction to the Q factor theory by Hill et al (1994) is given.…”

Section: The Quality Factor Qmentioning

confidence: 99%

“…The Q factor of an electrically large, lossy cavity has been calculated by Hill et al (1994), assuming a uniform energy density throughout the cavity. On the one hand, this theory is only an approximation, as cavity resonances and the exact interior field strength distribution are not considered.…”

Section: The Quality Factor Qmentioning

confidence: 99%

“…where V shield is the volume of the shield, λ the wavelength and σ TCS the transmission cross section, which is given in Hill et al (1994) for circular apertures. If the aperture is electrically small and the direction of the incident transverse electromagnetic (TEM) wave is perpendicular to the front side of the shield as in fig.…”

Section: The Quality Factor Qmentioning

confidence: 99%

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Effects of Aperture Size on <i>Q</i> factor and Shielding Effectiveness of a Cubic Resonator

et al. 2017

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Abstract. The EMC properties of a cubic metallic shield are highly affected by its resonances. At the resonant frequencies, the shielding effectiveness (SE) collapses, which results in high field strengths inside the cavity. This can cause failure or even breakdown of electronic devices inside the shield. The resonant behaviour is mainly determined by the quality or Q factor of the shield. In this paper, the effects of the aperture size on the Q factor and the SE of an electrically large, cubic shield are analysed. At first, a method is developed in order to determine the Q factor based on the resonance behaviour of the shield in time domain. Only the first resonance of the shield is considered therefore. The results are evaluated for different aperture diameters and compared with theory for the Q factor. The dominant coupling mechanism of electromagnetic energy into the shield is thus identified.Then the effect of aperture size on the SE is analysed. The excitation of resonances is very probable if the interfering signal is an ultrawideband (UWB) pulse, which constitutes a typical intentional electromagnetic interference (IEMI) scenario. Therefore, the relation between aperture size and SE is analysed using the theory of the transient SE for a broadband signal with a constant spectral density distribution. The results show, that a "worst case" aperture size exists, where the SE has its minimum.

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Section: The Quality Factor Qmentioning

confidence: 99%

Section: The Quality Factor Qmentioning

confidence: 99%

Section: The Quality Factor Qmentioning

confidence: 99%

Section: The Quality Factor Qmentioning

confidence: 99%

See 2 more Smart Citations

Effects of Aperture Size on <i>Q</i> factor and Shielding Effectiveness of a Cubic Resonator

et al. 2017

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“…Especially, an RC is a useful facility in testing both emission and immunity of electronic devices. The typical RC which is based on statistic theories has been designed in a cavity with fully metallic walls [1,4] and the related standards are published in IEC 61000-4-21 and ISO 11452-11. Many studies on rectangular, triangular, and asymmetric RCs with the same volume have been carried out [5,6,7].…”

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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References

2009

Electromagnetic Fields in Cavities

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Aperture excitation of electrically large, lossy cavities

Cited by 308 publications

References 15 publications

Effects of Aperture Size on <i>Q</i> factor and Shielding Effectiveness of a Cubic Resonator

Effects of Aperture Size on <i>Q</i> factor and Shielding Effectiveness of a Cubic Resonator

Research on a guideline of stirrer installation in reverberation chamber

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Aperture excitation of electrically large, lossy cavities

Cited by 308 publications

References 15 publications

Effects of Aperture Size on &lt;i&gt;Q&lt;/i&gt; factor and Shielding Effectiveness of a Cubic Resonator

Effects of Aperture Size on &lt;i&gt;Q&lt;/i&gt; factor and Shielding Effectiveness of a Cubic Resonator

Research on a guideline of stirrer installation in reverberation chamber

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Contact Info

Product

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About

Effects of Aperture Size on <i>Q</i> factor and Shielding Effectiveness of a Cubic Resonator

Effects of Aperture Size on <i>Q</i> factor and Shielding Effectiveness of a Cubic Resonator