Amplitude Probability Distribution Measurement for Electric Field Intensity Assessment of Cellular-Phone-Base Stations

Abstract

In compliance assessments of radio-frequency exposure from cellular-phone-base station antennas, the root of 6-min time average of the squared electric fields is commonly required. Under the assumption that the time-varying electric fields belong to an ergodic process, a new approach has been proposed to estimate the 6-min time average from the ensemble average of the squared electric fields based on amplitude probability distribution (APD) measurements for a shorter time, much less than 6 min. The usefulness of the approach has been demonstrated at the 800-MHz band and the 1.5-GHz band, and the results have shown that by using a fast sampling rate, 1-min APD measurements could give a good estimate of the 6-min time average with an accuracy of within ±10%.Index Terms-Amplitude probability distribution (APD), base station antenna, cellular phone, electric field intensity assessment.

Comparative Analysis of Electromagnetic Field Exposure Levels and Determination of the Minimum Safe Distances From Mobile-Phone Base Stations in Urban Areas

“…Studies have reported the development of procedures, prediction formulas and instrumentation for assessing the SAR and radio frequency electromagnetic fields (RF-EMFs) of base station antennas, in terms of the antenna parameters, distance and time variations and amplitude probability of exposure levels [9][10][11][12][13].…”