Miniaturized Conical Waveguide Filtenna for 5G Millimeter Wave Base Stations

摘要

This paper presents the design, manufacturing, and measurement of a novel miniaturized 3D printed conical waveguide filtenna concept for use in the 5G New Radio n257 band. Field tests, for the band 26.5 to 27.5 GHz, motivates the desire to add a filtering functionality to the wideband horn antenna. Miniaturization is achieved by adding a lens to the antenna and exploiting the symmetrical resonance properties of a cylindrical resonator for dual-mode operation. Therefore, the manufactured concept filtenna consists of a miniaturized lens-fitted conical horn antenna with an integrated 4^{th order 3D printed dual-mode cylindrical waveguide filter. Tuning screws in the filter enable mechanical control over the filtenna centre frequency and bandwidth. The manufactured filtenna achieves a 10 dB return loss bandwidth of 2 % about a centre frequency of 27 GHz, and a gain of 14.8 dBi.}