Novel Integrated Design of a Dual-Band Dual-Polarization 5G mm-Wave Antenna Array with a U-Slotted Full-Metal Casing for a Cellular Phone

A novel integrated design of a dual-band dual-polarization millimeter-wave (mm-Wave) antenna array to a full-metal casing with U-shaped slots of a cellular phone with a high screen-to-body ratio (based on the display active area) over 94.5% for the fifth generation mobile communications (5G) technology is proposed and this integrated design is promising to the future potential attractive antenna solution of mm-Wave antennas in non-mm-Wave antennas (AiA) especially when a metal frame or a metal casing is applied to the exterior of a cellular phone. The novel mm-Wave antenna array is based on 5 dual-band dual-polarization stacked patch antennas embedded in the metal exterior. Bases on simulations, in terms of input reflection coefficients |S nn | ≤ –10 dB, the bandwidths of the ports (V-ports) in the mm-Wave antenna array for the vertical-polarization (V-pol.) range from 27.38 GHz to 28.49 GHz and from 36.92 GHz to 40.23 GHz, respectively; similarly, the bandwidths of the ports (H-ports) in the mm-Wave antenna array for the horizontal-polarization (H-pol.) range from 27.29 GHz to 28.54 GHz and from 36.94 GHz to 40.37 GHz, respectively. In other words, the 5G mm-Wave bands of n261 (27.5–28.35 GHz) and n260 (37.0–40.0 GHz) in the third generation partnership project (3GPP) can be hence accommodated by this presented design. The maximum V-pol. peak realized gains in the low band (band n261) and high band (band n260) are 11.64 dBi and 13.36 dBi, and both of the maximum scanning angles for the two band are 45°. Similarly, the maximum H-pol. peak realized gains in the low band and high band are 11.38 dBi and 12.13 dBi, and the maximum scanning angles are 60° and 30°, respectively. Additionally, in this design, owing to the ground shading of the recessed metal cells, the performance of the antenna array will be not so susceptible to the display, metal back cover, or feeding structures. As a result, the conformal feeding mechanism can thus be employed easily.