The Research Of Shared-aperture Antenna Based On Fabry-perot Resonator

With the continuous progress of science and technology,modern communication means are changing with each passing day.As the main equipment to receive and send electromagnetic wave,antenna plays a vital role in the communication system.5G technology being widely used today,people have higher and higher requirements for communication system performance.Antenna technology is also developing towards high gain,multi-polarization,high bandwidth,miniaturization and low sidelobe.Among them,Fabry-Perot resonant antenna and reflectarray antenna are common types of high gain antennas.Fabry-Perot resonant antenna achieves high gain effect by making the electromagnetic wave reflect multiple times in the resonant cavity.The reflectarray antenna mainly depends on the design of the size of the reflection element,by carrying out different phase compensation through different elements,making the reflected electromagnetic wave be in the same phase to achieve the purpose of high gain.In order to realize the miniaturization and integration of antenna,modern antenna engineers put forward the concept of shared-aperture antenna.Shared-aperture antenna refers to multiple antennas with different polarization and different bands that can work in the same aperture.It allows the antenna to achieve multi-function while reducing the overall size of the antenna as much as possible to reduce the cost.Therefore,people pay more and more attention to the improvement of aperture utilization ratio while pursuing the high gain performance of antenna.Based on Fabry-Perot resonator,this paper studies the performance of shared-aperture antenna to achieve high gain in dual bands.The main research contents are as follows:1.Firstly,the radiation principle of Fabry-Perot cavity antenna is studied and a novel dual-band high-gain shared-aperture resonant antenna is proposed,which consists of a low band resonant cavity,a high band resonant cavity and two feeders located in two resonant cavities respectively.Two Fabry-Perot resonators are formed by designing the characteristics of frequency selective surface(FSS)in the middle layer,and the high gain effect can be achieved in both bands.2.Secondly,the principle of high-gain reflectarray antenna is studied.By designing different sizes of unit cels to compensate phases of the reflector,the effect of high gain can be achieved.On this basis,the polarization conversion characteristic of unit cell is analyzed,and the folded reflectarray antenna which can realize crosspolarization conversion is studied.3.Finally,on the basis of previous research,a novel shared-aperture antenna is designed by combining Fabry-Perot resonator with folded reflectarray antenna.It can form Fabry-Perot resonator in low band and can be used as folded reflectarray antenna in high band.