Impedance of an electric dipole located in a cylindrical cavity in a dissipative medium |
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Authors: | J R Wait D A Hill |
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Institution: | (1) Cooperative Institute for Research in Environmental Sciences, University of Colorado, 80309 Boulder, CO, USA;(2) Institute for Telecommunication Sciences, Office of Telecommunications, U. S. Department of Commerce, 80302 Boulder, CO, USA |
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Abstract: | The electromagnetic fields of an electric dipole located inside a cylindrical cavity or empty tunnel are formulated. The results
are used to deduce an expression for the change of self-impedance due to the presence of the cavity or tunnel walls. A numerical
evaluation of the resultant convergent integral and a summation of the angular harmonic series were performed. An important
finding is that the input resistance of the dipole is approximately a constant for frequencies less than about 25 MHz for
a typical tunnel radius of 2 m. Such results are shown to be in qualitative agreement with an earlier analysis of an electric
dipole over a dissipative half-space. |
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Keywords: | 84 |
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