Fresnel Zones for Ground-Based Antennas

Download or read book Fresnel Zones for Ground-Based Antennas written by J. Bach Andersen and published by . This book was released on 1963 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ordinary Fresnel zone concept is extended to include the influence of finite con ductivity. 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. Only discontinuities of the elec trical parameters of the ground are considered. Extensive 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 infinite conductivity, especially for small angles of elevation. (Author).