Bicheng Technologies Limited
M4, TC350
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Dual Layer F4B High Frequency PCB board with 1.5mm PTFE (Teflon) thickness, 3 oz of
copper, and immersion gold
(PCB's are custom-made products, the picture and parameters shown are just for reference)
Hello everybody,
Today, we will focus on a specific type of high-frequency circuit board made from F4B series materials.
The F4B series is primarily composed of PTFE (Polytetrafluoroethylene) glass fiber cloth and ceramic-
filled PTFE glass fiber cloth. As a high-frequency material produced by a Chinese brand, it offers a cost-
effective solution without compromising on stability and quality.
Due to its reliable performance and affordability, F4B materials are widely used in applications such as
radar systems, navigation equipment, satellite communications, as well as 4G and 5G telecommunications.
PCB Specifications
| Layer count: | Double sided |
| Base material: | F4B DK 2.65 |
| Dimension: | 210 x 115mm |
| Finished thickness | 1.6mm ±10% |
| Finished Copper weight: | 3oz |
| SMOBC: | No |
| Surface finish: | Immersion gold |
The main specifications of this board is double sided board, substrate is F4B, DK at 2.65, 210mm long by
115mm wide, 1.6mm finished thick, finished copper 3oz, no solder mask no silkscreen, and surface finish
is immersion gold.
Let’s see the stack up.
Top layer and bottom layer are 3oz copper finished. F4b dielectric material is in the middle of 2 layers copper,
showing dielectric constant at 2.65
From the photo of this board, the track is thicker than normal boards; surface finish is immersion gold and
no solder mask and silkscreen.
Our PCB Capability (PTFE)
| PCB Material: | PTFE |
| Code: | F4B series |
| Dielectric constant: | 2.2, 2.55 and 2.65 |
| 2.17, 2.45, 2.75 and 3.0 | |
| Layer count: | 1 Layer, 2 Layer, Multilayer, Hybrid type |
| Copper weight: | 0.5oz, 1oz, 2oz, 3oz |
| PCB thickness: | 0.17mm, 0.25mm, 0.5mm, 0.8mm, 1.0mm, |
| 1.5mm, 2.0mm, 3.0mm, 4.0mm and 5.0mm, etc. | |
| PCB Size: | ≤400mm X 500mm |
| Surface finish: | Bare copper, HASL, ENIG, Immersion tin etc. |
The dielectric constant of F4B material is broad, ranging from 2.2 to 3.0, making it suitable for a variety
of high-frequency applications. The board thickness can vary from 0.17mm to 5.0mm, providing flexibility
for different design requirements.
We offer a full range of services, including prototype development, small batch production, and mass
production to meet your specific project needs.
If you have any questions or require further information, please don't hesitate to contact us.
Thank you for taking the time to read this overview.
Appendix: Data Sheet of PTFE(F4B)
| Name | Test condition | Unit | Value | |||
| Density | Normal state | g/ cm3 | 2.1～2.35 | |||
| Moisture Absorption | Dip in the distilled water of 20±2℃ for 24 hours | % | ≤0.02 | |||
| Operating Temperature | High-low temperature chamber | ℃ | -50℃～+260℃ | |||
| Thermal Conductivity | W/m/k | 0.8 | ||||
| CTE (typical) | 0～100℃ (εr :2.1~2.3) | ppm/℃ | 25(x) | |||
| 34(y) | ||||||
| 252(z) | ||||||
| CTE (typical) | 0～100℃ (εr :2.3~2.9) | ppm/℃ | 14(x) | |||
| 21(y) | ||||||
| 173(z) | ||||||
| CTE (typical) | 0～100℃ (εr :2.9~3.5) | ppm/℃ | 12(x) | |||
| 15(y) | ||||||
| 95(z) | ||||||
| Shrinkage Factor | 2 hours in boiling water | % | 0.0002 | |||
| Surface Resistivity | 500V DC | Normal state | M·Ω | ≥1×104 | ||
| Constant humidity and temperature | ≥1×103 | |||||
| Volume Resistivity | Normal state | MΩ.cm | ≥1×106 | |||
| Constant humidity and temperature | ≥1×105 | |||||
| Pin Resistance | 500V DC | Normal state | MΩ | ≥1×105 | ||
| Constant humidity and temperature | ≥1×103 | |||||
| Surface dielectric strength | Normal state | d=1mm(Kv/mm) | ≥1.2 | |||
| Constant humidity and temperature | ≥1.1 | |||||
| Dielectric Constant | 10GHZ | εr | 2.20,2.55,2.65,3.0,3.5 (±2%) | |||
| Dissipation Factor | 10GHZ | tgδ | 2.2 | ≤7×10-4 | ||
| 2.55~2.65 | ≤1×10-3 | |||||
| 3.0~3.5 | ≤1.5×10-3 | |||||