Electromagnetic Coupling to an Infinite Cable Placed Behind a Slot-Perforated Screen |
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Authors: | Umashankar KR Wait JR |
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Affiliation: | Cooperative Institute for Research in Environmental Sciences, University of Colorado/NOAA, Boulder, CO 80309. (303) 499-1000, ext. 6471; |
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Abstract: | We present an analysis of the electromagnetic coupling from an external illuminating field to an infinitely long thin cable placed behind the conducting screen that is perforated by a narrow slot. By using a Fourier transform representation for the unknown electric current on the cable, we obtain an integro-differential equation for the distribution of the electric field in the slot that accounts completely for the coupling. The transfer admittance function so obtained, is in a form very convenient to estimate the electric current on the infinite cable. Results of the slot electric-field distribution and the current induced on the infinite cable are given for a few typical cases. Not surprisingly, the axial distribution of induced voltage on the slot is markedly affected by the presence of the cable. |
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