Fresnel zones for ground-based antennas

J. Bach Andersen

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    Abstract

    The ordinary Fresnel zone concept is modified to include the influence of finite ground conductivity. This is important for ground-based antennas because the influence on the radiation pattern of irregularities near the antenna is determined by the amplitude and phase of the groundwave. A new definition of Fresnel zones which takes into account the phase shift of groundwave propagation is given and it is shown that these new zones are zones of greatest influence, at least when discontinuities of the electrical parameters of the ground are considered. Numerical results for the first Fresnel zone are given, and it is shown that the zone is much smaller for a finite conductivity than for an infinity conductivity, especially for small angles of elevation
    Original languageEnglish
    JournalI E E E Transactions on Antennas and Propagation
    Volume12
    Issue number4
    Pages (from-to)417-422
    ISSN0018-926X
    DOIs
    Publication statusPublished - 1964

    Bibliographical note

    Copyright: 1964 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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