effects of aperture size on q factor and shielding effectiveness of a cubic resonator
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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
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 caseaperture size exists, where the SE has its minimum.
| Reference Key |
parr2017advanceseffects
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|---|---|
| Authors | ;S. Parr;S. Chromy;S. Dickmann;M. Schaarschmidt |
| Journal | neuropsychiatrie : klinik, diagnostik, therapie und rehabilitation : organ der gesellschaft osterreichischer nervenarzte und psychiater |
| Year | 2017 |
| DOI |
10.5194/ars-15-169-2017
|
| URL | |
| Keywords | Keywords not found |
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