A Broadband Low-Profile Antenna Array Using Shorting Pins for 5G Millimeter Wave Applications

A broadband and low-profile antenna operating at 5G millimeter wave band with ring structure and shorting pins is presented. The antenna has impedance bandwidth of 23.35-28.92 GHz (21.4% for 26 GHz) and it can cover the 5G millimeter wave band (24.25-27.5 GHz). The antenna also can achieve a gain of better than 6.75 dBi, and the maximum gain reaches 9.4 dBi. The height of the antenna is only 0.09λ. The 1×4 antenna array with the isolation below -20 dB is designed based on the antenna element. In the working band of 24.25-27.5 GHz, the realized gain of the array is greater than 10.8 dBi, with a maximum gain of 14.5 dBi.