NDLI: Shielding effectiveness measurements for a large commercial aircraft

Content Provider	IEEE Xplore Digital Library
Author	Freyer, G.J. Hatfield, M.O. Loughry, T.A. Johnk, R. Johnson, D.M.
Copyright Year	1997
Description	Author affiliation: Universal Syst. Inc., Monument, CO, USA (Freyer, G.J.)
Abstract	The electromagnetic energy density in internal cavities of commercial aircraft is of increasing interest as the use of electronic systems to perform critical flight functions increases. This paper describes three test techniques which were used on a commercial transport aircraft to determine the external to internal coupling of electromagnetic energy over the frequency range 0.1 to 1 GHz. Coupling or shielding effectiveness measurements were performed on a Boeing 707 aircraft. The first technique used the external ambient electromagnetic environment as the excitation source. In the second technique, the aircraft was illuminated with band limited white Gaussian noise on a swept frequency carrier. The third technique used time domain analysis of the cavity electromagnetic environment generated by repetitive, short pulse excitation of the aircraft. Both of the direct excitation techniques included vertical and horizontal polarizations from three aspect angles. The shielding effectiveness data for the aircraft cockpit derived from the three techniques are in general agreement within measurement uncertainty. The minimum shielding effectiveness values are about 15 dB over the frequency interval 0.1 to 1 GHz. Polarization effects and aspect angle variations of a few dB were measured. The ambient electromagnetic environment excitation suggests the possibility of narrow band structure in the shielding effectiveness.
Starting Page	383
Ending Page	386
File Size	350138
Page Count	4
File Format	PDF
ISBN	0780336089
DOI	10.1109/ISEMC.1995.523586
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-08-14
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Aircraft Electromagnetic shielding Electromagnetic measurements Frequency Aerospace electronics Electromagnetic coupling Electromagnetic wave polarization Testing Performance evaluation Gaussian noise
Content Type	Text
Resource Type	Article

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