Dual-Polarized Dual-Frequency Ka-band Transmitarray Lens

In this contribution, a new dual-frequency unit cell for transmitarrays is presented. This cell is based on a rectangular structure consisting of 4-stacked rectangular patches coupled 2-by-2 using a cross slot. One of the polarization is optimized to be transparent at 28 GHz, and the perpendicular one at 38 GHz. The cell provides a phase delay up to 300 degrees for each polarization at both frequencies. Furthermore, it allows to develop different radiation patterns for each frequency independently. In order to show the potential applications of this cell, a transmitarray antenna has been designed and simulated. The antenna can focus the energy on a near-field spot at 28 GHz using one polarization and it can also steer a beam to the broadside direction with the other polarization at 38 GHz.