In this paper, an array antenna with linear and circular polarization characteristics is proposed for 28 GHz band 5G mobile handset applications. A 2×2 slot array antenna is designed for circular polarization in ±z directions; 1×8 and 8×1 dipole array antennas with linear polarizations are designed for 3D beam coverage by fan-beam steering. The proposed antenna is a stacked structure, and all radiating elements are printed on the middle layer of the stacked structure. The −10 dB reflection coefficient bandwidth and 3 dB axial ratio bandwidth of the proposed antenna fully covers the 28 GHz target band (27.5～28.35 GHz). The simulated peak gain of the proposed dipole array antenna is 11.71 dBi, and the half-power beamwidth in the elevation plane is 195° without beam steering. With the maximum beam steering on the azimuthal plane, the simulated peak gain of the proposed dipole array antenna is 10.52 dBi. Moreover, the simulated peak gains of the proposed 2×2 slot array antenna are 9.1 dBi in +z direction with left-hand circular polarization and 9.19 dBi in −z direction with right-hand circular polarization.
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Kim et al. (2020) studied this question.
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