September 1987 | NTIA Technical Memo TM-87-129

Procedures for Calculating Field Intensities of Antennas

Andrew Farrar; Eugene Chang

Abstract: This report discusses simplified procedures for calculating near and far field intensities of several types of aperture and wire antennas. The antenna technical characteristics listed in the Government Master File (GMF) were reviewed. For this analysis, two categories (i.e., linear and aperture) were found to be sufficiently representative of the majority of antenna types listed in the GMF. Existing analytical antenna models developed for a near field analysis of the antennas were identified. Some of these models were used to develop a simplified model for estimating near field radiation from Government radiocommunications systems. These models are conservative and are expected to yield higher field intensity or power density values than would be expected in actual practice. Measurements may be required to determine more exact values for these parameters.

Keywords: radio frequency radiation; computer model; antennas; Neodymium; Appleton-Hartree formula; linear and aperture antennas; near field analysis of antennas

To request a reprint of this report, contact:

Ed Drocella, Chief,
Spectrum Engineering and Analysis Division
Office of Spectrum Management
National Telecommunications and Information Administration
(202) 482-1652

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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