Next-generation 5G massive-MIMO radio units require high-density PCB designs that maintain ultra-consistent dielectric constant (Dk) and dissipation factor (Df) across all layers. Any variation in Dk/Df can lead to impedance mismatches, phase errors, and RF signal degradation, negatively affecting beamforming accuracy and spectral efficiency. RO4835 PCB laminates (Dk = 3.48 ± 0.03, Df = 0.0037...



