This study analyses the influence of a metasurface coupled to a rectangular microstrip antenna. The proposed metasurface converts linearly polarised electromagnetic waves into circularly polarised electromagnetic waves. The rectangular microstrip antenna is designed to operate at 2.45 GHz. The metasurface is coupled to the antenna in order to provide a structure capable of radiating circularly polarised electromagnetic waves without the need for adjustments to the antenna feed. In this analysis, the metasurface was designed from unit cells, distributed in a periodic arrangement acting as a polariser, when coupled to the upper part of the antenna. The geometry of the unit cells and their distribution in the arrangement were calculated in order to obtain an axial ratio below 3 dB in the design frequency range. Prototypes of the microstrip antenna and the metasurface were constructed to obtain experimental results and it was possible to observe a good convergence between the simulated and measured results.

The increasing demand for electricity has led humans to a growing exposure to artificial sources of electromagnetic emission, making it essential to determine the intensity of electromagnetic fields (EMFs), which is subject to the population of a given area. This Letter proposes an analysis of EMF exposure levels and spatial distribution over the region of the input and power circuits of a 230 kV/60 Hz air‐insulated substation. For this, measurement protocols were determined based on current standards and from spatial interpolation methods, a contour map was developed, allowing a complete evaluation of the behaviour and levels of EMF throughout the region. The results obtained indicate that exposure levels in this region are below those recommended by regulatory agencies.

This study presents the estimation of the electric and magnetic fields level inside a 400 MVA electrical substation. Located in the northeast region of Brazil, the power plant operates with 230 and 69 kV at 60 Hz frequency. The on‐site measurements were performed at previously selected locations covering the whole courtyard and followed the international and national regulatory standards. The electrical and magnetic fields 2‐D contour maps over the entire courtyard are presented, which allow better visualisation and analysis of the exposure levels around all equipment. By using the GoldenSurfer V.13 tool, eight interpolation methods were applied to predict unsampled locations. The plots were made using the method that best fit the sampled dataset after the cross‐validation technique is used. The measurements were taken during six days during a period of 16 h on 741 locations. For this electrical substation, the maps validate the high electric field level close to breakers and switches at 230 kV and high magnetic field close to equipment operating at 69 kV. The comparison between the exposure levels and those established in current guidelines indicate that the electromagnetic environment on this substation is safe for the occupational population as well as for the general public.