Research On Base Station Communication Antenna Based On 5G

With the rapid development of wireless communication technology,in recent years,the mobile communication has gradually entered the 5G era,it has more stringent technical requirements for the various components of the 5G communication system.As we all know,the antenna plays an important role in the mobile communication system,and often determines the performance of this communication system.Therefore,the base station antenna should have strong anti-interference ability outside the main working frequency band,so the role of the filter is particularly prominent.However,the current design concept of the base station antenna is miniaturization and integration.Integrating the antenna and the filter or applying the filter design idea to the antenna can greatly reflect the miniaturized design idea.In addition,the microstrip antenna has the advantages of low profile and easy integration,so it can be widely used in satellite communications,navigation and other fields.In recent years,researchers have found that the circularly polarized antenna is a useful tool to provide flexibility in the orientation angle between the receiving and transmitting antenna.So the circularly polarization antenna has been explored for many wireless applications,such as electronic reconnaissance,interference,communications,and electronic countermeasures.Therefore,this paper studies the circular polarization filter antenna and the dual polarization filter base station antenna.The main work content and innovation work of this thesis includes the following four parts:1.The background and research significance of circularly polarized antenna,dual polarized antenna and filter antenna are introduced in this thesis.The different methods of implementing circularly polarized antenna and filter antenna are enumerated,and the current implementation of filter antenna is also introduced.Brief analysis and method induction are summarized,and the difficulties and shortcomings of the current technology are listed.Finally,the current application background and practical application significance of circular polarization filter antenna and dual polarization filter antenna are proposed.2.According to the design idea of the step impedance filter,and based on the existing knowledge and means,a low pass filter with small size and wide stop band is introduced.In order to demonstrate the practical application of the filter,the filter is cascaded with a monopole narrow band antenna to achieve wide harmonic suppression.The filter has a-3dB cut-off frequency at 4GHz,S21 is less than-0.1dB in the passband,and S11 is less than-15dB in the stopband of 5GHz-20GHz,indicating that the filter has better filtering effect and lower insertion loss.3.According to the design principle and idea of the cavity filter,a multi-layer low profile dual polarization filtering MIMO base station antenna is designed.In this chapter,a dual polarized low profile base station antenna based on 5G communication is designed and composed of a 1×3 antenna array.4.According to the design principle and ideas of the cavity filter,a multi-layer structure low profile filter antenna is introduced,and a circular polarization filter antenna is realized by a90°power divider.The height of the filter antenna is 5.535mm,only 0.064?_g(?_g is the wavelength corresponding to the antenna working center frequency),and the impedance bandwidth of this antenna(VSWR<1.5)is 3.16GHz-4.23GHz.The bandwidth(AR<3)is3.18GHz-3.76GHz,and the working frequency band of the antenna is located in the 5G communication band,so it can be used for 5G satellite communication.The antenna can achieve a maximum gain of 7.5dB in the operating frequency band.In terms of out of band rejection,the gain of the antenna is lower than-15dB,which has good filtering effect and strong anti-signal interference capability.