Fully Metallic 3D-Printed Omnidirectional High-Gain Array Antenna for 5G Application

This paper presents a novel omnidirectional high-gain array antenna operating at 5G-NR band based on fully metallic 3D printing technology. Radiation units consist of V-shaped slots. And open-ended sleeves are applied to the air-filled coaxial line. Omnidirectional radiation pattern is achieved by the modes of open-ended sleeves, and this array antenna presents a high-directivity beam at boresight direction. To verify the performance of proposed design, a prototype is fabricated. The measured results demonstrate wide impendence bandwidth of 19.5% (3.20 GHz to 3.89 GHz) and peak gain of 8.13 dBi with radiation efficiency of 99.2%, which are well matched with the simulated results.