A three-loop antenna system for performing near-field measurements of electric and magnetic fields from video display terminals

Abstract

This paper discusses the use of a three-loop antenna system (TLAS) for near-field measurement of electric and magnetic fields from video display terminals (VDTs). We calculated the electric and magnetic dipole moments to derive the electric and magnetic field patterns in the near field region. Electric and magnetic fields, emitted by several different models of VDTs, were evaluated with the TLAS and were compared with those measured by conventional electric and magnetic field probes at different distances and directions from VDTs. A good correlation (/spl plusmn/1.6 dB) between the two measurement techniques was found. This agreement is within the accuracy (/spl plusmn/2 dB) of the conventional field probe measurements.