A 28 GHz 4 × 4 U-Slot Patch Array Antenna for mm-wave Communication

In this paper, a 28 GHz $4\times 4$ U-slot patch array antenna for mm-wave communication is proposed. The proposed antenna is comprised of16 rectangular patchs with U-slot and microstrip line feed network. Rectangular patch antennas are arrayed in $4\times 4$ formation to obtain a high gain. The -10dB reflection coefficient bandwidth of array antenna is 4.91 GHz (25.16 GHz −30.7 GHz) and the maximum gain is 17.01 dBi in the y-z plane.