Definition

Rogers RO4350B is the most widely used high-frequency laminate globally, offering the best balance of RF performance, processability, and cost. Specs: Dk 3.48 ±0.05 (process) at 10 GHz, Df 0.0037, CTE 14/16/35-41 ppm/°C, Tg >280°C, UL 94 V-0 certified. Frequency stability is demonstrated from 500 MHz to 77 GHz with very low temperature coefficient of Dk. RO4350B processes like FR-4 with no sodium etch required and works well in hybrid stackups with FR-4 for cost optimization. Cost runs 4-6x FR-4 (typically $46-78/sq ft). Default to RO4350B for RF designs from L-band through automotive radar at 77 GHz. Reserve RT/duroid for applications demanding the absolute lowest loss.