[Estimation of the restricted area related to the limitation of exposure of the general public to electromagnetic fields in the vicinity of microwave relay antenna systems].

Background: The aim of the study was to analyze and modify methods used to estimate the range of restricted area corresponding with the limitation of exposure of the general public to electromagnetic fields in the vicinity of microwave relay antenna systems.

Materials And Methods: In this paper a well known spherical-wave model is revised. Some drawbacks of this model in terms of the microwave relay antenna systems are shown and a method for their elimination is proposed. The idea of this method is based on placing an equivalent point source of radiation behind the actual antenna, and then on taking into account the power density produced by this source over the antenna aperture.

Results: In the course of the study an algorithm for the range of restricted area estimation was developed. Some results of calculation validating the proposed method are presented.

Conclusions: The proposed model and algorithm for the range of restricted area estimation may be employed in administrative procedures for evaluating the effects exerted on the environment. The proposed method can be regarded as an alternative to the presently employed spherical wave approach in the case of the microwave relay antenna systems.