3D printing-based sparse dielectric rod antenna

The invention discloses a 3D printing-based sparse dielectric rod antenna, which comprises a dielectric rod and a printed logarithmic periodic antenna. The 3D printing-based sparse dielectric rod antenna is characterized in that the printed logarithmic periodic antenna consists of an upper metal layer, a lower metal layer, a dielectric substrate and a metalized via hole. M air grooves and N air holes are respectively and periodically formed in the cross section of the dielectric rod. Each air groove and each air hole are respectively positioned in the outer edge and the cross section of the dielectric rod. The central distribution axes of the air grooves and the air holes are overlapped with the central axis of the dielectric rod. Meanwhile, the printed logarithmic periodic antenna fed bythe substrate integrated waveguide is used as an excitation source, so that the size of the feed structure is reduced. The dielectric rod is formed through 3D printing, so that a complex structure iseasy to machine. The machi