Accession Number : ADA138068

Title :   Buried Antenna Analysis at VHF. Part 1. The Buried Horizontal Electric Dipole.

Descriptive Note : Master's thesis,


Personal Author(s) : Burks,J W

PDF Url : ADA138068

Report Date : Jan 1984

Pagination or Media Count : 68

Abstract : A method was developed to find the far-field radiation pattern of a buried horizontal electric dipole (HED) at 37.5 MHz. The imaginary part of the index of refraction was shown to be negligible for dry soil at this frequency so standard antenna theory and ray-optic theory was used. The effect of the ground-air interface was modeled using the transmission coefficient and Snell's law for a dielectric interface. Because the current distribution for the buried HED depends on antenna construction, results are shown for the far-field pattern in the air for different current distributions on the HED. The literature on this problem was reviewed; most used the Sommerfeld or moment methods to make the same calculations. The results of one of the reports using the Sommerfeld method could be compared and were found to be similar. An extensive bibliography is included. The anlaysis was then applied to a buried antenna array. The current distribution was known and was used to calculate the far-field pattern. It was concluded that the far-field pattern is highly dependent on the current distribution. This part is classified.

Descriptors :   *Antenna arrays, *Underground antennas, *Antenna radiation patterns, *Dipole antennas, Dry materials, Very high frequency, Refractive index, Soils, Surface to air, Coefficients, Snells law, Far field, Interfaces, Transmittance, Subroutines, Construction, Patterns, Dielectrics, Theory, Antennas, Radiation, Theses

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE