Date of Award
1990
Document Type
Thesis
Publication Status
Version of Record
Submission Date
October 2026
Thesis/Dissertation Advisor [Chair]
Helmken, Henry
Abstract
It has been proposed that the use of a small number of ground radials elevated above the surface of the earth can yield similar or actually better radiated performance than a larger number (typically 120) of buried ground radials in the case of a monopole element used in the standard AM broadcast band. This proposal is based on the results of numerous computer modelling. The author knows of no A-B field tests compared to the computed data. A case study is performed at 1 MHz (the center of the standard AM broadcast band) using the NEC-81 computer program modelling both the elevated and buried ground radial scenarios and comparing the findings to the identical measured data. Tower impedances, currents in both the tower legs and along the elevated radials, and radiated fields along one radial and in between two radials at 1 km are presented.
Extent
74 p.
Recommended Citation
Overton, David Hill, "Comparison of computer modelled monopole element with both 120 buried ground radials and 4 elevated ground radials at various heights using NEC-81 versus measured field data in the standard AM broadcast band at 1 MHz" (1990). Electronic Theses and Dissertations 1990 - 1999. 20.
https://digitalcommons.fau.edu/etd_general_4/20
Identifier
FADT14655
Comments
College of Engineering and Computer Science|FAU Electronic Theses and Dissertations Collection|Thesis (M.S.)--Florida Atlantic University, 1990.|College of Engineering and Computer Science