In this article, the authors propose a new model of metasurface able to convert linearly polarized signals in circularly polarized signals for a planar antenna array designed to operate at the ISM frequency band (2.45 GHz). All simulated results were obtained using the Ansoft HFSS TM software. The prototypes were produced and their transmission characteristics were measured. A good agreement between simulated and measured results was obtained. The proposed structure presents a linear-to-circular polarization conversion feature, with good bandwidth and axial ratio. Besides, the structure is simple and maintains the advantages of low profile and low cost. V C 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:861-864, 2016; View this article online at wileyonlinelibrary.com.

In this article, the authors proposed a new structure able to convert signals linearly polarized generated by a microstrip antenna for circularly polarized signals at two operating bands (2.45 and 5.8 GHz), for use in portable radio frequency identification readers, using two miniaturized metasurfaces. All simulation results were obtained using the commercial software HFSS™. Prototypes were built and their characteristics were measured. We obtained a good agreement between simulated and measured results. The proposed structure is able to obtain linear to circular conversion in two bands of interesting, with a large bandwidth for return loss and axial ratio. The structure is simple and presents good advantages as low profile and low cost. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2294–2300, 2016