In this article, an extension of the spatial filter method to study Fabry‐Perot antennas with homogeneous or inhomogeneous partially reflecting surface (PRS) of finite size is proposed. This tool was subsequently validated through the study of different Fabry‐Perot antennas, with homogeneous PRS and inhomogeneous GRadient‐INdex (GRIN) PRS that present very high side lobe level (SLL). Since they are due to structure truncation, a new inhomogeneous PRS to reduce the SLL is designed with the new analytical tool. The new inhomogeneous PRS for Fabry‐Perot antenna is characterized by simulations and measurements. Compared to the homogeneous PRS antenna, the proposed PRS allows a SLL reduction of 5 dB without decreasing the 14 dBi directivity.
In this study, we have performed numerical simulations using the commercial full-wave software CST, in order to show the increasing of the performance of a normal patch antenna. Photonic band gap structures based on one and two-dimensional photonic crystals have been used. The numerical simulation results have enabled us to have better performances. A comparison of simulated results between the antennas alone and in the presence of PBG structure and shaped metamaterials structure has been presented. We show then that the PBG structures contributes significantly to improving the directivity, gain and angular width and provides a better matching of the antenna compared to the shaped metamaterial patterns.
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