Electric Fields Radiated from a Cellular Phone Base Station Antenna Constructed on a Roof-Top

Abstract

In this article, electric fields radiated from a cellular phone base station antenna constructed on a reinforced concrete roof-top will be investigated by the finite-difference time-domain method, by the near-zone to far-zone transformation technique, and by experimental measurements. From obtained radiation patterns, it is found that the theory of the finite-difference time-domain method implemented with the near-zone to far-zone transformation technique makes a good agreement with the experiment. Simulation results of electric fields radiated from the cellular phone base station antenna are presented and compared, with experimental data measured by a Narda broadband field meter. From electric field distributions on a plane with a height of 1 meter above the roof-top, it is again shown that simulation results calculated by the finite-difference time-domain method make a good agreement with those obtained by measurements. Within 50 meters of the cellular phone base station, the electric fields obtained by measurements and calculations are in the ranges of 0.15–42.47 and 0.24–39.57 V/m, respectively. The maximum electric field strength of 42.47 V/m is less than 45% of the ANSI/IEEE standard for public exposure at 1,795 MHz.