A Compact AiP with a Dual-Polarized 1x4 Antenna Array for 5G Smartphone Applications

In this paper, we introduce a compact 28GHz lx4 antenna array featuring shorted parasitic elements, designed on a 10(4+2+4) multi-layer organic substrate. This allows for a broad bandwidth in a compact Antenna-in-Package (AiP) module. To address the size constraint, we introduce a novel design that is a stacked patch antenna incorporating shorted parasitic elements. This innovative design uses smaller parasitic elements but doesn't compromise on performance. By grounding the parasitic elements appropriately, the parasitic elements with the shorting pin is realized, leading to a reduced half of component area. Post-optimization, the size is refined from 6. 5×25 mm^2 to 4.5×25 mm^2, marking a 31% reduction. Performance-wise, simulations reveal a return loss exceeding 10 dB within the 25–30 GHz spectrum, about 5 GHz bandwidth, and a high-gain per element radiation pattern (over ~6 dBi) suitable for 28GHz applications. Our results affirm that by manipulating the signal phase in individual antenna elements, beamforming can be oriented towards a precise direction. The beam steering range spans approximately 75 degrees. This compact antenna design offers both bandwidth and size advantages, making it an attractive solution for 28GHz mm Wave bands in mobile devices, specifically for n257, n258, and n261 channels.