Research On Wide-angle Scanning Multi-beam Antenna Based On Over-molded Coaxial And 3D Printed Lumberg Lenses

Multi-beam antenna can form multiple beams in different directions by using only one antenna in space,which can reduce the size of the antenna,reduce the cost,and achieve wide angle beam coverage.Multi-beam antenna is the key technology in modern wireless communication,which has different application prospects in various occasions.In this paper,the multi-beam antenna with wide angle scanning ability is studied in detail.The main achievements are as follows:1.A-multi beam antenna with coaxial waveguide and biconical horn is introduced in this paper.Compared with other antenna,this antenna has the advantages of simple structure,low cost and wide beam width.Firstly,the overmoded coaxial waveguide is analyzed,and the cut-off frequencies of various modes at different operating frequencies are obtained.Then,the linear superposition of multiple modes working at the same time is qualitatively analyzed and the influence of antenna structure parameters on antenna beam is studied by using full wave simulation software HFSS.The continuity of coaxial waveguide to biconical horn is ensured by optimizing the transition structure from coaxial waveguide to biconical waveguide,and the horizontal beam scanning is realized by feeding at different angles.Finally,a multi-beam antenna at 10.25 Ghz is developed which can realize a 360° beam coverage in azimuth plane by feeding at five different angles.The gain of the proposed antenna can reach up to 9dB.2.In view of the shortcomings of the traditional Luneburg lens antenna,which is difficult to manufacture and control the uniform and fine change of dielectric constant from 2 to 1,a Luneburg lens multi-beam antenna based on 3D printing technology is proposed in this paper.Compared with the traditional Luneburg lens antenna,3D printing technology improves the accuracy of the change of dielectric constant,reduces the difficulty of Manufacturing technology,reduces the cost and the performance degradation caused by material constraints,improves the performance of the antenna.Firstly,the relationship between the dielectric constant and the size of dielectric elements is analyzed,and then modeling Luneburg lens antenna with MATLAB and CST.A circle of TSA antenna array is placed equiangular around the lens,and the beam scanning in horizontal plane is realized by switching feed between TSA units.Finally,a multi-beam Luneburg antenna at 10.25 Ghz is developed which can realize a 100° beam coverage in azimuth plane.And the physical processing and testing are carried out.The experimental results show that the beam consistency is good,and the gain of the proposed antenna can reach up to 19 dB.