Abstract
An efficient practical method for the electromagnetic (EM) fields reduction around transmitting stations has been developed. The project has been stimulated by the necessity to reduce the field levels in the vicinity of transmitting stations, including FM, UHF, cellular base stations and other radiocommunication services, to obey regulations concerning human protection against electromagnetic radiation. The main constraint in the optimization procedure is the requirement to preserve the radiated power ERP of a service in operation. The method joins accuracy with high efficiency, and is based on 3 stages procedure using the antenna numerical models of different levels of approximation. An example is given of its application to a real case of transmitting stations in which the levels of measured EM exceeded the safety limits.
Highlights
A practical problem often met in antenna techniques is the necessity to modify the electromagnetic fields (EMF) distribution generated by an antenna system
The problem can emerge due to various reasons, in particular due to requirements concerning the human protection against EMF radiation [1,2]
The violation of safety limits was detected via control measurements in certain points around a transmitting station located on the top of a local mountain (Radio and TV Transmission Station on Swiety Krzyz Mountain, Kielce, Poland, see Fig.1)
Summary
A practical problem often met in antenna techniques is the necessity to modify the electromagnetic fields (EMF) distribution generated by an antenna system. For that purpose we use a synthetic model [10], in which the radiation characteristics of elementary sources (antenna panels or patches) are evaluated by direct numerical solution of Maxwell’s equations At this stage the source of radiation responsible for the violation is identified. The main constraint in the procedure of modification is that the coverage area of the service must be kept unchanged and that the excitations above the safety limits in some other points should not appear With this method the effect of modifications on the field distribution can be observed immediately in real time of simulation. The proposed procedure is very efficient, flexible, and allows finding the necessary modifications so that they meet the economic and technical requirements It has been successfully used and tested in practice. We will describe the method in more detail on the example of its application to a real life problem
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
