Additively Manufactured Wideband Millimeter-Wave Sidelobe Suppression of Metalens Antenna

This paper designs a transmissive metalens unit with independent control of amplitude and phase. The proposed metalens can be used as an antenna-in-package (AiP) solution to shape the radiation patterns for the millimeter-wave (mm-Wave) transceiver chip modules. The proposed metalens unit cell has three metal layers. The top and bottom layers are metal grids. The middle layer is a T-shaped metal structure used to control the amplitude and phase. The unit cell works in the frequency band of 50-60GHz, the amplitude control range is 0-0.935, and the phase shift range is over 360 degrees, which can realize the independent control of amplitude and phase. Based on the unit cell, a wideband high-gain, low sidelobe levels metalens antenna is designed, with excellent performance (SLL better than -25 dB, beam deflection of ±30 degrees).