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Radio frequency electromagnetic fields in large conducting enclosures: effects of apertures and human bodies on propagation and field-statistics

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JournalIEEE Transactions on Electromagnetic Compatibility
DatePublished - May 2006
Issue number2
Volume48
Number of pages7
Pages (from-to)304-310
Original languageEnglish

Abstract

Radio frequency propagation in an electrically large resonant chamber (a screened room) was simulated by two models: a statistical combination of multiple resonant modes and a computational electromagnetic simulation [the transmission line matrix (TLM) method]. The purpose of this work was to investigate the effects of passengers and windows on electromagnetic fields (EMF) in aircraft and other vehicles. Comparison of the multimode models with measurements made in a screened room showed that as the electromagnetic losses increased, the transmission between two internal antennas was reduced, and there were fewer turning points in its frequency response. The autocorrelation of this frequency response provided a useful estimate of the composite Q-factor of the resonances and showed that the Q of the chamber was reduced from a value of the order of 10 000 when emptied to 1000 when windows were added and when filled with people to 100. The TLM simulation provided further useful information about the statistical variation of electric field strength with position.

    Research areas

  • aircraft, cavity resonators, electromagnetic compatibility, electromagnetic fields, propagation, Q-factor, statistics, transmission line matrix methods, vehicles, DIELECTRIC-PROPERTIES, RESONANT-CAVITY

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