28-GHz Wideband Dual-Polarized Parasitic-Patch Antenna Array on Tile-Scale Package

A wideband design of the dual-polarized patch antenna array was proposed and realized on tile-scale package. This substrate-based package was employed, and its dimensions considered the requirement for tiling up the array, in order to boost EIRP in the 28-GHz frequency band. The novel same-layer dual-polarized feeding and coupling slots combined with colocated parasitic patches achieved a wide impedance bandwidth while all array elements were excited and steered. Based on measurement, the realized gain of the antenna system was ∼18 dBi from 26 - 29.5 GHz for both polarizations. The measured isolation of polarization port was > 30 dB. The active reflection coefficient was maintained below -10 dB and cross-polarization remained below -15 dBi, while the array was steered up to ±55°. The impact on radiation performance was discussed for this tilepackage concept and assembly.