Beamforming bow-tie antenna for millimeter-wave applications using metamaterial lens

This paper presents a new approach to achieve a beamforming network for 60 GHz applications. The proposed technique consists of a printed bow-tie antenna with end-fire radiation type integrated by an array of metamaterial lens. Embedded in the elevation-plane of the printed bow-tie antenna, an array of metamaterial unit-cells with low-index is proposed to obtain a beam-tilted angle of 22 degrees with respect to the end-fire direction. Furthermore, the antenna gain is enhanced by 6 dBi, when the proposed unit-cells are integrated compared to a conventional bow-tie antenna. The simulation results indicate that with this technique a scanning angle of 22 degree can be achieved across the frequency band of 57-64 GHz while the reflection coefficient is below -10 dB.