The invention provides a low-cost Luneberg lens antenna designed based on a 3D printer, which mainly solves the problems of complicated structure and inconvenient 
processing in the prior art. The antenna comprises a hemispherical lens (1), a circular 
metal reflecting plate (2), a plastic bracket (3) and a Vivaldi feed source (4). The hemispherical lens is fixed on the upper surface of the circularmetal reflecting plate, and the spherical center coincides with the circular center of the reflecting plate. The Vivaldi feed source is fixed at the 
focal length position of the hemispherical lens. The hemispherical lens is a meshed filling structure composed of a spherical core (11) and two 
layers of hemispherical shells (12, 13), wherein a first layer of hemispherical shell is nested outside the spherical core, a second layer of hemispherical shell is nested outside the first layer of hemispherical shell, and the spherical core and the two 
layers of hemispherical shells have different equivalent 
dielectric constants and correspond to filling media with different filling rates. The antenna of the invention has the advantages of simple structure, low cost, high 
gain, convenient processingand manufacturing and good 
scanning beam consistency in the whole 
frequency band, and can be used in 
satellite communication, automobile anti-collision 
radar and 
microwave remote sensing.