Wideband Wide Beam-Width Modified Angled Dipole Antenna for 5G Millimeter-Wave IoT Applications

Abstract

In this work, a millimeter-wave wideband wide beamwidth modified angled dipole antenna is proposed for 5G millimeter-wave(mmW) IoT applications. The modified angled dipole antenna which has a dipole arm that is bent once more perpendicular to the ground plane compared to the existing angled dipole is proposed to improve not only the beamwidth but also the S11 bandwidth. The image current is formed in the direction perpendicular to the ground by the dipole arm bent to be orthogonal to the ground. Because only the E-field in the direction perpendicular to the ground can be formed by the boundary condition, the E-field radiated from the proposed antenna can be radiated along the ground plane, and thus the E-plane beamwidth is widened, and the H-plane beamwidth can be widened. The measured -10 dB S11 bandwidth is 5 GHz(=17.8%) ranging from 25.7 GHz to 30.7 GHz, and the measured HPBW is 160°±5 ° and 310 pm 10 for the E-plane and H-plane, respectively. To verify whether the proposed antenna is practically applied to 5G IoT applications, the beamforming IC was connected to the proposed antenna array, and the E-plane beam-forming radiation pattern was measured. Although it was applied only to the -90 ≤ β ≤90 range, the -3 dB E-plane beamwidth was 130°, ensuring wide coverage.