Communication Power Amplifier PCB

A 4-layer hybrid PCB combining S1000H FR-4 with Rogers RO4350B high-frequency laminate at 1.1±0.11mm thickness, finished with ENIG. The Rogers layer carries RF power amplifier matching networks, transmission lines, and bias-tee structures for sub-6GHz cellular, microwave, and S/C/X-band applications, while the FR-4 sub-stack handles digital control, supply rails, and bias regulation. RO4350B's stable Dk of 3.48 and low Df enable predictable matching from prototype through volume production. ENIG provides flat solder pads for LDMOS and GaN device packages and protects against solder bridging on tight-pitch RF land patterns. Typical use cases include 5G remote radio units, microwave backhaul transmitters, satellite ground-terminal amplifiers, defense radar drivers, and broadcast transmitter boards. Production requires hybrid lamination flow tuning and thermal management features such as embedded copper coins or heavy-copper backside planes.