What is microwave RF high frequency pcb?

What is microwave RF HIGH FREQUENCY PCB?

The high-frequency PCB circuit board is a special circuit board with a high electromagnetic frequency. Generally, the high frequency can be defined as a frequency above 1 GHz. Its physical properties, precision, and technical parameters are very high, and it is often used in automotive anti-collision systems, satellite systems, radio systems and other fields.

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.

RF - Radio Frequency PCBs

Radio-frequency (RF) and microwave (MW) circuits can be found in countless wireless products from handheld devices for medical and industrial applications to advanced communications systems for base stations, radar and global positioning. The success of these high-speed products begins at the product design stage when the PCB laminate materials are selected. Oneseine works with the product design team to insure that the project’s cost/performance targets can be met by providing information on material options, relative costs and DfM considerations. Once the design has been completed, Oneseine follows the boards from prototype through to production where key process variables such as line widths and dielectric spacing are measured and controlled to insure the product meets the designed requirements and delivers consistent performance throughout the products life cycle.

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.

A high-frequency PCB can meet your needs when incorporating a special signal requirement into your electronic components and products. It offers a frequency range of 500MHz - 2GHz, making it ideally suited for high-speed designs, as well as radio frequency (RF), microwave and mobile applications.

High frequency PCB characteristics

The high-frequency PCB circuit board provided by the utility model is provided with a rib-blocking rib at the upper opening and the lower opening edge of the hollow groove of the core board, so that the core board and the upper surface and the lower surface are covered. When the copper plate is bonded, the flow glue does not enter the hollow groove, that is, the bonding operation can be completed by one press-fitting, and the high-frequency circuit board which can be completed by the secondary pressing in the prior art, the high-frequency circuit in the utility model The board has a simple structure, low cost and is easy to manufacture.

High frequency PCB introduction

High frequency PCB circuit board

The high-frequency circuit board includes a core plate provided with a hollow groove and a copper clad plate bonded to the upper surface and the lower surface of the core plate by flow glue, and the upper opening and the lower opening edge of the hollow groove are provided with a rib.