Highly-Integrated Millimeter-Wave Wideband Slot-Type Array Antenna for 5G Mobile Phones

A highly-integrated wideband slot-type array antenna formed using parallel-connected dual open-slots as the array element for 5G mobile phones is presented. The proposed wideband millimeter-wave array antenna can achieve 5.6 GHz bandwidth (-10 dB S
₁₁
definition) from 23.9~29.5 GHz to cover the whole 26 GHz and 28 GHz bands (n258 and n257 bands) of 3GPP 5G NR specification. A 4-element linear array antenna prototype is implemented by using simple printed circuit board (PCB) process for experimental study. The 4-element linear array antenna occupies a small layout area of 21.3×1.64 mm
²
at the short side edge of a PCB. Results show that wide-coverage fan-shape beamforming patterns and wide beam scanning coverage about 120 degrees can be achieved.