RF exposure compliance assessment for radio base station with built-in antenna

This paper proposes a method for evaluating the distribution of an electric field to assess the RF human exposure compliance of indoor radio base stations employing a built-in antenna that radiates broadband RF signals such as an Orthogonal Frequency Division Multiplexing (OFDM) signal. Indoor base stations are used to enhance broadband wireless service and the built-in antenna is directly connected to the transmission power amplifier and cannot be removed easily. The three-dimensional distribution of the electric field from the antenna is calculated from the measured near field distribution, which is excited by a broadband RF signal, and the compliance boundary where the calculated electric field strength is equal to the exposure limit is determined in order to assess the RF human exposure.