Research And Design Of Multi-frequency Common Aperture Antenna Array

With the development of wireless communication technology,antennas as a device capable of transmitting and receiving electromagnetic waves have been used more and more widely in modern life,and at the same time,the requirements for antenna performance have become higher and higher.Through a reasonable spatial layout,the shared aperture antenna can support multiple antennas to operate simultaneously in the same antenna aperture.Compared with traditiona L band antennas,shared-aperture antennas have higher space utilization.The shared-aperture antenna occupies less space under the same frequency,which can meet the needs of the system for multi-frequency operation and effectively increase the system capacity.Based on the multi-frequency work of the shared-aperture antenna,this paper conducts research on the multi-frequency and dual-polarization of the shared-aperture antenna.The main contents of this paper are as follows:Firstly,this article introduces the development history of shared aperture antennas,as well as the research status and background at home and abroad.The basic principles of microstrip antennas are introduced,including the radiation principle of microstrip antennas,the analysis methods and feeding methods of microstrip antennas.The analysis of microstrip antenna arrays mainly includes linear arrays,planar arrays and feed networks of microstrip antennas.Secondly,the basic radiation principle of the double-layer microstrip patch is introduced,and a shared-aperture antenna unit based on slot coupling feed is designed.The working frequency range of the antenna is 2GHz?2.12 GHz,2.18GHz?2.3GHz,and the antenna unit is fed by slot coupling.Simulate the shared-aperture antenna unit voltage standing wave ratio,axial ratio,gain and other parameters.In order to achieve the high gain of the antenna,a 2×2 antenna array is designed based on the shared-aperture antenna unit.And based on the antenna array simulation results,the mutual influence between adjacent antenna elements was evaluated,and the feasibility of the antenna array design was verified.Thirdly,the L/S band dual circular polarization shared-aperture antenna is designed.The antenna uses a multilayer board process,the upper layer of the antenna is an S band antenna,and the lower layer is an L band antenna.The S band antenna uses a single feed point and cut angle to meet the circular polarization performance of the antenna.A single coaxial line is used for direct center feeding,which effectively simplifies the feeding structure of the antenna.The length of the L band antenna is bigger than S band antenna,so the L band antenna is placed on the lower layer of the S band antenna.The L-band antenna uses a double feed point for feeding,and the circular polarization performance of the antenna is formed by a one-to-two power divider.The antenna has undergone physical processing and testing,and the measurement result is basically the same as the simulation result,realized the design of dual circular polarization shared-aperture antenna.Finally,the UHF/S-band multi-band dual-polarization shared-aperture antenna is designed.The antenna uses a multi-layer board processing technology,the upper layer is an S band antenna,and the lower layer is a UHF band antenna.The S-band unit adopts double feed points for direct feeding,and uses two coaxial lines for feeding.By controlling the amplitude and phase of each feed port,the ability of antenna beam deflection and wide-angle coverage can be achieved.Because the UHF band antenna has a larger aperture,it is placed under the S band antenna.The antenna feeding mode is two-point feeding,and the circular polarization performance of the antenna is realized by a one-to-two power divider.The antenna has undergone physical testing,and the measured performance is basically consistent with the simulation results,Realized the design of multi-band dual-polarization shared-aperture antenna.