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Table of contents
Introduction
I State of the art
I.1 ElectroMagnetic SECurity (EMSEC)
I.1.1 Introduction
I.1.2 EMSEC at component level
I.1.3 EMSEC at system level
I.1.4 EMSEC at building level
I.1.5 Conclusion
I.1.6 Need to study reverberant environments
I.2 Couplings to and inside reverberant environment
I.2.1 Introduction
I.2.2 Electromagnetic couplings through apertures
I.2.3 Electromagnetic couplings within a cavity
I.2.4 Electromagnetic field to conductors couplings
I.2.5 Cavity regimes
I.2.6 Conclusion
I.2.7 Selection of approaches for the study of couplings inside cavities from an electromagnetic
security (EMSEC) perspective
II Design and assessment of computer chassis models
II.1 Design of computer chassis models
II.1.1 Introduction
II.1.2 The simulation model
II.1.3 Design and production of a computer chassis mock-up
II.1.4 Design and production of devices to measure couplings
II.1.5 Conclusion
II.2 Comparison between the two models for two configurations
II.2.1 Introduction
II.2.2 Electric field amplitude and couplings assessment with the two models .
II.2.3 Applicability of the simulation model to determine statistics
II.2.4 Conclusion
III Application of the Random coupling model
III.1 Application of the Random Matrix Theory to determine couplings inside microwave cavities
III.1.1 Introduction
III.1.2 The Random Matrix Theory (RMT)
III.1.3 The random coupling model (RCM)
III.1.4 Set up of the random coupling model (RCM) for the two configurations of interest
III.2 Determination of the impedance/admittance of an aperture
III.2.1 Introduction
III.2.2 First estimation
III.2.3 Second estimation
III.2.4 Impedance of an aperture between two regions
III.2.5 Mapping of the aperture impedance to the RCM
III.3 Numerical computation of the aperture admittance
III.3.1 Introduction
III.3.2 Numerical error estimation
III.3.3 Integration of Grad mn over kx
III.3.4 Integration of Brad,ms mn over kx and ky
III.3.5 Computation of Brad mn by means of the Hilbert transform
III.3.6 Impedance and admittance
III.4 Monte-Carlo simulations
III.4.1 Introduction
III.4.2 Elements statistics of the normalized impedance matrix ξ
III.4.3 RCM implementation
III.4.4 Statistics of the elements of the normalized impedance matrix
III.4.5 Relation between the variance of ii, ij and α
III.4.6 Chaoticity of the random normalized impedance matrix
III.4.7 Statistical quantity of interest for EMSEC
III.4.8 First RCM application
III.4.9 Conclusion
III.5 Measurements
III.5.1 Introduction
III.5.2 Use of a small stirrer to generate a chaotic environment
III.5.3 Methods to determine the parameters of the RCM
III.5.4 First comparison: monopoles
III.5.5 Second comparison: printed circuit boards
III.5.6 Effects of absorbers on the magnitude of induced currents
III.5.7 Coupling between the aperture and the internal ports
III.5.8 Conclusion
Conclusion
IV Appendix
A Tables of the mock-up deformations
B Admittance of an aperture
C Derivation of the Random coupling model
C.1 Introduction
C.2 Derivation of the RCM in two dimensions
C.3 Statistical representation
C.4 Radiation impedance as a deterministic quantity
C.5 Generalisation to the multiple port case
D Determination of the antenna factor from experimental data, and of the electric field from the antenna factor
D.1 Determination of the electric field strength at a distance D from an antenna using its antenna factor AF
D.2 Determination of the antenna factor with two identical antennas
E Résumé des travaux
E.1 Introduction
E.2 La sécurité électromagnétique (SECEM)
E.3 Méthodes d’étude des couplages dans les cavités
E.4 Établissement et évaluation de deux modèles de châssis d’ordinateur
E.5 Le modèle de couplages aléatoires
E.6 Conclusion
E.7 Travaux futurs
