Research On Fabry-Perot Resonant Cavity Antenna Based On Frequency Selective Surface

With the rapid development of science and technology in recent years,people’s requirements for the performance of wireless communication systems are increasing day by day,and antennas play a crucial role in wireless communication systems.The Fabry-Perot resonant cavity antenna has been a hot topic of research at home and abroad because of its simple structure and small size to achieve high gain performance.To address the problems of the existing Fabry-Perot resonant cavity antenna such as poor beam deflection angle,narrow bandwidth and difficulty in achieving electromagnetic stealth,this paper introduces the frequency selective surface to the partially reflective surface for optimization,and combines the improved design of the feed antenna to finally achieve beam deflection and electromagnetic stealth function based on high gain and large bandwidth.In this paper,based on the analysis of Fabry-Perot resonant cavity antenna principle,a new frequency selective cell structure is designed by introducing open resonant ring into the upper partially reflective surface cell structure,and the phase difference between cells is evenly arranged by optimizing the cell structure arrangement law to avoid the adverse effect of large phase difference on the antenna beam,and finally the gap coupled feed antenna is combined with The Fabry-Perot resonant cavity antenna with beam deflection is achieved by combining a partially reflective surface with a frequency selective surface.The experimental results show that the antenna operates from 4.9GHz to 6.1GHz,with a relative bandwidth of 20.8%and a maximum gain of 12.5dBi,and achieves a beam deflection angle of 56°.By further studying the upper part of the reflecting surface of the Fabry-Perot resonant cavity antenna,two different frequency selective surface cell structures are designed,which can redirect the reflected waves to reduce the radar scattering cross section(RCS)on part of the transmitting surface by using the different compensation phases of the two cell structures.A Fabry-Perot resonant cavity antenna with Electromagnetic stealth is designed by optimising the tessellation arrangement of the surface cells.The experimental results show that the antenna operates in the frequency range of 6GHz-14GHz with a relative bandwidth of 24%and a maximum gain of 16.1dBi;compared with the reference antenna,the RCS of the antenna is reduced by more than 6dB.