Research On Multi-beam Reflector Antenna Based On FP Array Feeds And Espps Graphene Attenuator

In recent years,with the development and advancement of social science and technology,communication between people has become more frequent,and the data transmission have become greater.Coupled with the expansion of communication applications,the communication environment has become more complex and comprehensive.Therefore,the communication systems need more comprehensive,stable and adjustable performance.In the satellite communication system of a specific radar system,the antenna is not only an indispensable device with high-frequency current and electromagnetic wave conversion function,but also required to have the characteristics of high gain,narrow beam,multi-beam,multi-polarization and full coverage.Coverage and other characteristics,which also make multi-polarization and full-coverage multi-beam antennas become the current research focus.Due to good optical,thermal,electromagnetic properties,graphene has important applications in materials,chemistry,communications,biology,medicine and other fields.And graphene is widely used in the research of dynamically adjustable microwave devices because of its adjustable resistance in the microwave frequency band.Among them,the dynamically adjustable attenuator has huge application prospects in communication systems such as phased array antennas.This article mainly focuses on the following aspects:First,the principle of the radiation of the array feed in the rotating parabolic reflector is analyzed.Secondly,a linearly polarized Fabry-Perot resonant cavity antenna is designed and combined into a 3*3 array.Through simulation and experiment,it has high gain,port isolation and good sidelobe performance.Finally,the Fabry-Perot array is used as the feed source of the rotating paraboloid,so that the spacing of the feed sources can be further reduced.Second,based on the principle of converting linear polarization of reflection and superposition into circularly polarized waves,a chiral metamaterial structure that can convert linear polarizations in different directions into circularly polarized waves is proposed.Taking the chiral metamaterial structure as a part of the reflective surface and using linearly polarized wave feeds in the x-axis and y-axis directions,a dual-circularly polarized Fabry-Perot resonant cavity antenna unit is designed.The dual circularly polarized Fabry-Perot resonator antenna unit is combined into a 3*3 array,and a suitable rotating parabolic reflector is designed to form a complete array.Covered multi-beam antenna.The designed circularly polarized multi-beam antenna structure is simple and easy to process,and does not require complex feed sources and feed networks.Third,based on the principle of Effective Surface Plasmon Polaritons(ESPPs)and the characteristics of graphene's adjustable resistance in the microwave range,two graphene-based dynamically adjustable ESPPs attenuators are designed.At the same time,the method of mode matching and transverse equivalent network are used to analyze and calculate the electromagnetic field in the attenuator and the influence of parameters on the attenuation,and verified by simulation and experiment.