Electric fields radiated from a cellular phone base station antenna constructed on a roof-top

摘要

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.