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Immersion Silver High Frequency PCB

Immersion Silver High Frequency PCB

Immersion silver high frequency PCB 1.video presentation Uniwell circuits is leading supplier of high quality printed circuit board and related PCB services in China. We specialize in manufacturing and fabrication of flexible, rigid-flexible, single-sided, double-sided and multi-layer rigid...

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Immersion silver high frequency PCB

1.Product describe 

Layer: 2 layers 
Board: Ro4450B. 
Thickness: 0.5 mm 
Surface treatment: immersion gold/ HASL/Lead free HASL/ Immersion silver/Tin /OSP, etc. 
Minimum aperture: 0.45mm. 
Application: medical care 
Features: high frequency board 

The growing data traffic is constantly driving the demand for faster signal transmission. In the electronics industry, PCBs have become high speed expressways, carrying billions of pulses per second. This capability needs special know-how in PCB design and manufacturing. High accuracy in the design and production is the key item required for control of capacity effects. 

Uniwell circuits supports you with designing high frequency PCBs (HF-PCBs). We help you to find suitable substrates, to define the trace dimensions and to calculate the impedance effects for you. Uniwell has a wide range of HF-PCB base materials on stock and can deliver your high frequency PCBs within the shortest possible time.

2.Video presentation 

Uniwell circuits is leading supplier of high quality printed circuit board and related PCB services in China. We specialize in manufacturing and fabrication of flexible, rigid-flexible, single-sided, double-sided and multi-layer rigid printed circuit board up to 32 layers.


3.Product certificate
We rely heavily upon customer and manufacturing feedback to provide a world-class production , our staff love supporting customers to find a solution to reduce cost of products without sacrifice quality.
With years of professional pcb and pcba assembly service , Uniwell will be your right choice , you will an excellent business partner at Uniwell.


4.Lead time & logistics 
Lead time
Uniwell offers quick turn service without sacrifice quality, 1-2 layer in 24 hours, 4-6 layer in 48 hours.



Sample order

Mass order


24 hours

3working days

7working days


24 hours

4working days

7working days



5-6working days

10working days



7-9working days

15working days

FR-4 based, Exclude material lead time

CIF AIR/SEA, FOB HK/SZ, etc. you can choose the method you prefer.


5.Packaging & delivery
inner side :Vacuum  outside : carton box


UPS,DHL, EMS, Fedex, sea shipping etc. we have a long term cooperation with them , they will offer us the best price. Or if you have your own forwarder ,you can tell us and we will arrange it for you.


6.little knowledge ---What is high frequency PCB
Electronic devices with high frequency is the developing tendency nowadays, especially in wireless network. Satellite communication growing rapidly, information products move towards high speed and high frequency. Thus developing new products always need to use high frequency substrate, satellite system, mobile telephone receiving base station and so on, these communication products must use high frequency PCB.

The features of high frequency PCB as following:
1)DK should be small and stable enough, usually the smaller the better, high DK may lead to signal transmission delay.
2)DF should be small, which mainly affect quality of signal transmission, the smaller DF could make smaller signal wastage accordingly.
3)The thermal expansivity 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.
4)Water absorptivity must be low, high water absorptivity will affect DK and DF when in the wet environment.
5)Heat resisting property, chemistry resisting, impact endurance, peel off resisting must be good.

Generally speaking, high frequency can be defined as frequency above 1GHz. Currently, polyfluortetraethylene(PTFE) material is widely used in high frequency PCB manufacturing, it's also called Teflon, which frequency is normally above 5GHz. In addition, FR4 or PPO substrate can be used to the product frequency among 1GHz~10GHz. These three high frequency substrate have below differences:

With regard to laminate cost of FR4, PPO and Teflon, FR4 is the cheapest one, while Teflon is the most expensive one. In terms of DK, DF, water absorption and frequency feature, Teflon is the best. When product application require frequency above 10GHz, only can we choose Teflon PCB substrate to manufacture. Obviously, the performance of Teflon is far better than other substrate, However, Teflon substrate has the disadvantage of high cost and large heat resisting property. In order to improve PTFE stiffness and heat resisting property function, a large number of SiO2 or fiber glass as the filling material. On the other hand, due to molecule inertia of PTFE material, which it is not easy to combine with copper foil, thus, it needs to do special surface treatment on the combination side. With regard to combination surface treatment, normally use chemical etching on PTFE surface or plasma etching to plus surface roughness or add one adhesive film between PTFE and copper foil, but these may have influence on dielectric performance.

Uniwell circuits offers lots of high frequency PCB include Rogers, Taconic, Arlon etc, for several types of high frequency substrates, we have sufficient storage to ensure fast delivery.

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