September 2011 | NTIA Technical Report TR-11-481
Eric D. Nelson; Nicholas DeMinco
Abstract: NTIA/ITS has developed an improved electromagnetic compatibility (EMC) analysis method that can be applied to more accurately model real scenarios for evaluating interference. The methodology described in this report can be used to conduct EMC analyses for base stations that use a variety of antennas. The model can be used to determine the received power in the proximity of the base station at both the fundamental and harmonic frequencies. It uses accurate radio-wave propagation models and antenna models. The antenna models can be created for the fundamental and third harmonic frequencies of many antennas. Fields adjacent to the base station antenna are heavily influenced by interactions with ground, and the electromagnetic fields are dominated by the side lobe structure of the elevation pattern of the base station antenna. The described rigorous EMC analysis for a base station considers all of these factors to assess interference more accurately than previous methods.
Keywords: electromagnetic compatibility (EMC); land mobile radio; numerical electromagnetic code (NEC); undisturbed field method; third order harmonics; received power; global positioning system; folded-dipole antenna
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Eric D. Nelson
Institute for Telecommunication Sciences
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.