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Modelling of electromagnetic wave penetration through loaded apertures
Author(s) -
Gobin V.,
Alliot J. C.,
Degauque P.
Publication year - 1991
Publication title -
international journal of numerical modelling: electronic networks, devices and fields
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.249
H-Index - 30
eISSN - 1099-1204
pISSN - 0894-3370
DOI - 10.1111/j.1365-2834.1996.tb00045.x
Subject(s) - diffraction , active listening , aperture (computer memory) , integral equation , ground plane , optics , plane (geometry) , electrical impedance , computer science , physics , acoustics , mathematical analysis , mathematics , geometry , telecommunications , psychology , quantum mechanics , communication , antenna (radio)
Calculation of the electromagnetic field diffracted by an aperture situated in a perfectly conducting ground plane can be made through the well‐known theory of polarizabilities. However, simple expressions are only obtained under conditions which are not often fulfilled in electromagnetic compatibility problems since, for example, the disturbing field incident on the aperture must be considered as a uniform one. Furthermore, if the aperture is loaded by a low conducting material, available approximate formulas are only valid for a small circular hole. In this paper, we present a numerical approach based on the determination of the equivalent magnetic current distributed on the surface of the aperture. This distribution is the solution of an integral equation solved by the method of moments. This formulation allows us to take the surface impedance of a loading material and the contact resistance between this material and the rim into account. The validation of the computer code is shown by comparing computed and analytical results on some typical examples. Few applications are also described.