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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Duffy, Alistair Paul (1993)
Languages: English
Types: Unknown
Subjects:
Electromagnetic Compatibility (EMC) problems may occur in many environments. This Thesis considers a particular sub-set of coupling within shielded enclosures. The actual systems studied are the coupling between a dipole and either one or two rods in a screened room and the effect of a cavity and apertures on a signal travelling along a wire. Experiments are described for the screened room which investigate the repeatability of the measurements and the effects of two closely spaced conductors on the coupling results. The cavity experiments also consider the repeatability of the measurements and the effects of the apertures. Transmission-Line Modelling (TLM) is compared with some other popular modelling methods and generally described. It is applied to the modelling of the experimental systems already discussed. An inherent error associated with the modelling of wires in TLM, manifesting itself as an apparent decrease in the resonant frequency of a wire-like structure, is investigated. The source of the error is deduced and a method of minimising it is proposed. The experimental results are applied to the validation of TLM, and its error correction. Very good comparisons between the experiments and simulations are reported. Correlelograms are investigated as a method of comparing the modelled and experimental results.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • 4. MEASURING ELECTROMAGNETIC COUPLING IN A SCREENED ROOM AND IN A CAVITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 46 4.1. INTRODUCTION TO VERIFICATION TESTS . . . . . . . . .. 46 4.2. ENVIRONMENTS INVESTIGATED 49 4.3. SCREENED ROOM EXPERIMENTAL PROCEDURES AND UNCERTAINTIES . . . . . . . . . . . . . . . . . . . . . . . . .. 52 4.3.1. Metrology .. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 53 4.3.2. Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 55 4.3.3. Dipole and rod positioning errors " 59 Sadiku MNO, Obiozor eN; Annotated bibliography of numerical modelling in electromagnetic compatibility; International Journal of Numerical Modelling; 4; 1991; pp. 259-269.
    • Chen Z, Ney MM, Hoefer WJR; A new finite-difference time-domain formulation and its equivalence with the TLM symmetrical condensed node; IEEE Transactions on Microwave Theory and Techniques; MTTĀ·39; 1991; pp. 2160-2169.
    • Nielsen JS, Hoefer WJR; Modification of the condensed 3-D TLM Node to improve modeling of conductor edges; IEEE Microwave and Guided Wave Letters; 2, no. 3; 1992; pp. 105-107.
    • Naylor P, Christopoulos C, Johns PB; Analysis of the coupling of electromagnetic radiation into wires using transmission-line modelling; IERE Fifth Int, Conf. on Electromagnetic Compatibility 1-3 Oct publ no 71; 1986; pp. 129-135.
    • Hejase HAN, Adams AT, Harrington RF, Sarkar TK; Shielding effectiveness of "pigtail" connections; IEEE Transactions on Electromagnetic Compatibility; 31, no.
    • 1; 1989; pp. 63-68.
    • Shih Y-C, Hoefer WJR; Dominant and second-order cutoff frequencies with a twodimensional TLM-program; IEEE Transactions on Microwave Theory and Techniques; 28; 1980; pp. 1443-1448.
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