Design Of Wideband And Multiband Fabry-Perot Resonator Antennas

With the advancement of modern science and technology,wireless communication and other technologies have achieved rapid development.The propagation of various information is not only fast and efficient,but also more diverse,all of which stem from the applications of electromagnetic fields and electromagnetic waves in the radio technology.As the front end of wireless communication systems,the antennas need to be studied,and their performance should be continuously improved.For example,in the long-distance communication system,the antenna needs to have higher gains.When the communication device with many functions is small,the antenna needs to cover a wider frequency band or many narrower frequency bands.As one kind of high-gain antennas,the Fabry-Perot resonator antenna（FPRA）has obvious advantages in the miniaturization and the high efficiency.Therefore,this thesis aims at designing some novel high-performance FPRAs.Specifically,a FPRA with the single-layer dielectric substrate,a FPRA with the double-layer dielectric substrates,and a dual-band FPRA with the single-layer dielectric substrate are designed and implemented.Main contribution of this thesis can be summarized as following.1.A wideband Fabry-Perot resonator antenna based on the single-layer substrate is proposed.The antenna adopts the slot coupling patch feed,by which not only complexity of the feeding network is avoided,but also wideband stable gains for the FPRA are provided.In the partially reflective surface（PRS）,the element with the combination of regular hexagonal patch and hexagonal branch is used,which is more closely arranged and has better reflection performance than the traditional quadrilateral structure.The experimental results show that 3d B gain bandwidth of the FPRA is 25.3%（from 8.7 GHz to 11.4 GHz）,and its peak gain is 13.8 d Bi.In addition,-10d B reflection coefficient bandwidth of the FPRA is 26%（from 8.6 GHz to 11.2 GHz）.Compared with the existing similar FPRAs,the proposed FPRA has not only wider gain bandwidth,but also better radiation performance.2.A wideband FPRA based on the two-layer substrates is designed and implemented.In the first-layer substrate,the element with the combination of regular hexagonal patch and regular hexagonal ring is adopted.While in the second-layer substrate,the element with the combination of regular hexagonal patches,regular hexagonal rings and tripod branches is used.The combination of these two elements not only makes electrical dimension of the FPRA more compact,but also makes the substrates obtain a positive reflection phase gradient in 9.1-13.5GHz frequency band.The antenna adopts the dual-patch feed coupling with two slots,which ensures wideband characteristics of the FPRA.The measured results indicate that 3d B gain bandwidth of the FPRA is 34.2%,and its peak gain is 14.2 d Bi.Compared with some existing FPRAs,the proposed antenna has a smaller size（0.6 λ₀×2.2 λ₀×2.2 λ₀）and a wider 3d B gain bandwidth.3.A dual-band Fabry-Perot resonator antenna based on the single-layer substrate is designed by simulation.Circular patches are printed on both sides of the substrate,and the periodic arrangement of circular patches enables the substrate to obtain the reflection performance in both X-band and Ku-band.The FPRA adopts the double-feed slot-coupled patch feed,which realizes the working performance in both X-band and Ku-band.The optimized FPRA has good impedance characteristics and directivity.Whether in the X-band or the Ku-band,its operating frequency bandwidths are more than 10%,and its gains are all higher.