Low-profile Wideband Antenna Array for 5G Millimeter-Wave Smartphone Applications

This paper proposes a 1 × 4 low-profile wideband patch antenna array applying to 5G millimeter-Wave smartphone applications. The design has low profile of 0.608 mm and uses stacked square patches to broaden the bandwidth. Additionally, four floating parasitic strips are utilized to further improve the bandwidth performance. The cross-linear polarizations are realized by using two feeding probes and a shorting pin via is exploited at the center of the lower substrate to enhance the polarized purity and impedance matching. The simulated |S
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| of the element is below -10 dB covering the 3GPP band n257 and n258 with a bandwidth of 24.00–29.67 GHz (21.81% at 26 GHz). The simulated active S-parameters of antenna array are below -6 dB in the targeted frequency range.