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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2011-01-21
A Quasi-Static Theory for Dielectric-Coated Thin-Wire Antenna Structures
By
Alex Ike Mowete,

    Prof. Alex Ike Mowete

    Department of Electrical and Electronics Engineering

    University of Lagos

    Nigeria

    Homepage

Ade Ogunsola,

    Dr. Ade Ogunsola

    Rail Transit Division

    Parsons Group International

    UK

    Homepage

Leonardo Sandrolini

    Dr. Leonardo Sandrolini

    Electrical, Electronic, and Information Engineering “G. Marconi

    University of Bologna

    Italy

    Homepage

Progress In Electromagnetics Research Letters, Vol. 20, 45-54, 2011
doi:10.2528/PIERL10121104 | Google Scholar

Abstract
Analytical investigations of the problem of dielectriccoated thin-wire antenna structures have invariably focused on the physics of developing appropriate models for the dielectric insulation on the thin-wire conductors that serve as antenna for the structure. These include the frequency domain moment-method-based approaches in which the dielectric insulation is replaced by equivalent volume polarization currents; and the time-domain analysis based on the `equivalent radius' concept. An earlier paper gave a physical interpretation to the frequency-domain solutions to suggest that the volume polarization currents derive from an equivalent static charge distribution, which excites an essentially radially-directed quasi-static field, confined to the region associated with the dielectric insulation. It is the main objective of this paper to investigate the veracity of the claims made in open literature as they concern the physics of the model for the dielectric insulation in terms of the electric field excited in the dielectric region. And to that end, simulation experiments were carried out, using a commercial Transmission Line Matrix (TLM) Method code, with which the characteristic features of the radial and axial components of the electric field within the dielectric region were investigated. The simulation results obtained from the experiments suggest that the field in question is not only of the quasi-static variety, but that it is also characterized by an axial component that meets the boundary condition of vanishingly small values on the surface of the conducting wire, to support the theory proposed.
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Citation
Alex Ike Mowete, Ade Ogunsola, and Leonardo Sandrolini, "A Quasi-Static Theory for Dielectric-Coated Thin-Wire Antenna Structures," Progress In Electromagnetics Research Letters, Vol. 20, 45-54, 2011.
doi:10.2528/PIERL10121104
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