Low-Cost Stackable Phased Array Antenna Integration to Enhance Beam Coverage of Millimeter-wave Wireless Applications

This paper introduces a novel low-cost, stackable patch antenna-in-module that incorporates two 4-element phased arrays into a single die package with a height profile of less than 1.25 mm (0.12 λ₀). By individually adjusting the weight matrix of the excitation ports, the AiP achieves three independent switchable main beam directions (±z-axes / +y-axis). The experimental and simulated results validate the AiP’s performance, showing an improvement of the spherical coverage CDF by more than 4.5 dB at the 50-percentile point compared to a reference model.