JH PCBA Rigid-Flex PCB

Mature different kind HF material mixed lamination technology: FR4+PTFE,FR4+408HR,FR4+ROGERS

3mil/3mil min trace w/s, impedance control tolerance within ±8%

Materials available: rogers, Shengyi, taconic, teflon, arlon, etc.

What is High Frequency (HF) PCB?

High Frequency (HF) PCB is that kind special circuit boards with high frequency > 1GHz, with relative high purchase price. The physical properties, precision, technology parameters requests of high frequency PCB is quite high, normally used in cars collision avoidance system, satellite system, 5G base station communication devices etc fields.

Keep them in mind when choosing high frequency PCB

Dielectric constant(Dk): DK should be small and stable enough, usually the smaller the better, high DK may lead to signal transmission delay.

Dissipation Factor(Df): DK should be small and stable enough, usually the smaller the better, high DK may lead to signal transmission delay.

Coefficient of thermal expansion: The Coefficient of thermal expansion should be the same with copper foil as much as possible because the difference will lead to copper foil separated in the changes of cold and heat.

Moisture Resistance: Moisture absorption must be low, or will result in Dk and Df loss when in a wet environment.

Professional technology engineers good at the details how to control HF PCB good quality

• Before solder mask, HF boards can’t be scrubbed, or will leads to poor adhesive force, so micro-etch by chemicals is the best way of coarsening.

• Most material of HF PCB are PTFE, using normal milling cutter will cause much tiny burrs, so we use special double edged milling cutter to guarantee slot size tolerance±0.1mm and prevents tiny burrs.

• The impedance control and trace width/spacing requests of HF PCB is quite strict, the tolerance just about 2%.

• The copper adhesive force is not ideal because high frequency material special features when PTH process, so before PTH, all vias and boards surface need coarsening preprocessing by using plasma and so on advanced equipment to improve PTH hole copper and solder mask adhesive force.