Study Of Miniaturized Communication Antenna Technologies

With the development of China's aerospace industry and the gradual entry of mobile communication technology into the 5G era,the performance requirements of communication equipment are becoming more and more stringent.Antenna is an important part in the communication system.Its performance directly determines the working state of the whole system.Now the communication system has changed from a single performance into the trend of multi function,multi band and multi scene,so one of the indicators of the size of antenna design become the key points of consideration.Because of its obvious advantages in conformation and reducing air resistance,the low profile antenna has been the focus of research in the field of space communication,and with the development of communication technology,it has become a hot spot in the field of mobile communication.Multi band wireless system has become mainstream,this puts forward higher requirements for anti interference between antennas.Cascade filter system with traditional antenna system design has great influence on the system size and performance,so the design of filter antenna is more and more important.This thesis focuses on the design of low profile antenna and filter antenna.The main contents are as follows 1.The current research trend of communication technology is introduced.The importance of the miniaturized antenna research is analyzed.The basic parameters of the antenna design,the principle of the artificial magnetic conductor material and the design principle of the filter are introduced.The design of miniaturized antenna is carried out from two angles: low profile circularly polarized antenna and filtering antenna.2.The design of low profile circular polarized antenna.In this paper,a low profile wideband circularly polarized antenna is designed based on the in-phase reflection bandgap characteristics of AMC materials.The antenna unit in this design adopts electromagnetic dipole antenna,thus ensuring the wide bandwidth of the final antenna.A design of side copper plating is put forward,which improved the axial ratio performance of the antenna and realized characteristic of wide axis ratio.3.The design of the filter antenna.In this paper,two filters with small size and resistance bandwidth are designed by using the miniaturized resonator principle,and two filter antennas with small size and a good out-band rejection characteristic are designed based on these two filters.In the design process,the interaction between the filter and the antenna is studied,and the frequency band of the filter antenna is adjustable.