UDC: 621.396.67:537.87:614 DOI: 10.7562/SE2019.9.02.05 Original article 81 | Safety Engineering Dejan Krstić 1 , Darko Zigar 2 , Nenad Cvetković 3 , Željko Hederić 4 , Dejan Jovanović 5 , Vladimir Stanković 6 1,2,5 Faculty of Occupational Safety, Niš, Serbia 3,6 Faculty of Electronic Engineering, University of Niš, Serbia: 4 Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, Croatia, Croatia 1 dekikrs@gmail.com 2 darko.zigar@znrfak.ni.ac.rs 3 nenad.cvetkovic@elfak.ni.ac.rs 4 zhederic@etfos.hr 5 dejan.jovanovic@elfak.ni.ac.rs 6 vladimir.stankovic@znrfak.ni.ac.rs ELECTROMAGNETIC SCREENING PLATE IN PROTECTION SERVICE TECHNICIANS FROM BASE STATION ANTENNA SYSTEMS Abstract: Service technicians on base station mobile phone systems are exposed to electromagnetic waves in the near field. This is an area where the values of the electrical and magnetic fields often exceed maximum limits defined by standards. The timing of exposure of people close to the antenna system, even if permitted values are not exceeded, indicates possible negative health effects. There is a need to use personal protective equipment in order to reduce the penetration of fields into human bodies. Therefore, it is important to analyze the protective screens in the form of a network of conductive materials that could be incorporated into workers’ clothes. Keywords: near electromagnetic field, service technicians, health risk from the electromagnetic field. INTRODUCTION Service technicians work close to the antenna systems which are turned on and those systems emit waves i.e. electromagnetic radiation most of the time. Usually, the antenna systems are mounted at the top of the roof, and there are several different operators in these sites. In most cases, the antenna on which they operate is turned off, but in some situations, service technicians work on antenna systems that are turned on. The investigation of the effects of electromagnetic radiation from technical equipment of telecommunication systems has been explained in our recent research article [1, 2]. We performed the calculation of the electromagnetic field on the body pointed to the increased field values, relative to the values allowed by the standard, even when the servicer is not in the direct radiation beam. The aim of this paper is to take care of workers’ health as well as the authors’ wish to investigate possible means of protection. For passive shielding, we chose a conductive grid plate of a rectangular shape with dimensions similar to the human body. Knowing that these fields can endanger human health emphasized the necessity to reduce the field components in the body during work. THEORY OF ELECTROMAGNETIC SHIELDING A possible way of protection is to use electromagnetic screens in the form of wire meshes. There are two screening options: good e-conductivity shielding and 1 Paper is presented in 14th International Conference on Applied Electromagnetics PES 2019, Nis, Serbia high permeability shielding. Good conductivity material induces currents whose EM field, depending on the problem configuration, can weaken and partially cancel the existing EM field. High permeability material - ferromagnetic, is a good magnetic "conductor" that represents a short circuit for a magnetic field. The magnetic field enters the ferromagnet, and in this way reduces the intensity of the field in the shielded space. At this moment, conducting wire mesh structure is analyzed. The physical flexibility of these structures is appropriate for plastic deformation and can be impregnated as part of protective clothes [3]. For this purpose, the behaviour of mesh screens is analyzed with square mashes and sizes which are small in comparison to the free-space wavelength. For this purpose, shielding effectiveness which consists of electric field and magnetic field shielding effectiveness e SE and m SE has been calculated in theory, 20log i e t E SE E  20log i m t H SE H  (1) where indices i and t correspond to the incident and transmitted wave. The shielding performance of mesh screens is considered wherein the individual meshes are square and of small size in comparison to the free-space wavelength. The shielding effectiveness of a wire mesh screen not only depends on the frequency of operation and dimensions of the screen mesh but also on the angle of incidence of plane wave [3]. For this reason, the expressions of analytical forms for SE are unsuitable for