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What is a high frequency circuit board?

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  • Published on.2022-07-01 07:05
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High frequency circuit boards

High-frequency PCBs are typically offered in the frequency range from 500 MHz to 2 GHz and can meet the needs of high-speed PCB design, microwave, RF and mobile applications.When the frequency is higher than 1 GHz, we can define it as high frequency.

Today, the increasing complexity of electronic components and switches requires faster signal flow rates.Therefore, a higher transmission frequency is required.High-frequency PCBs are very helpful when integrating special signal requirements into electronic components and products, offering the advantages of high efficiency, speed, low attenuation and constant dielectric properties.

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Some considerations for high-frequency PCB design

High-frequency PCBs are mainly used for radio and high-speed digital applications, such as 5G wireless communications, automotive radar sensors, aerospace, satellites, etc. However, many important factors need to be considered when manufacturing high-frequency PCBs.

- Multi-layer design

We usually use multi-layer PCB in high frequency PCB design.Multi-layer PCBs offer assembly density and small size, making them ideal for impact packaging.And multilayer boards facilitate shortening the connections between electronic components and increasing the speed of signal transmission.

Ground plane design is an important part of high frequency applications because it not only maintains signal quality, but also helps reduce EMI emissions.

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- Selection of materials

 First, substrates with low water absorption are more suitable for high-frequency pcbA production because this reduces the effect on dielectric constant (DK) and dielectric loss (Df).Second, the DK and Df of the substrate should be small and stable, which is conducive to improving the quality of signal transmission.Third, the substrate and the copper foil must have the same coefficient of thermal expansion.Failure to do so will result in separation of the copper foil.Finally, high-frequency PCB materials also need to have high heat resistance, chemical resistance and strong resistance to peeling.

The performance of high-frequency PCBs depends on the materials used for their construction.FR-4, Rogers and Teflon are the most popular materials used in high frequency PCB designs.


In summary, due to the performance advantages, high-frequency PCBs have been widely used in high-speed and high-density PCB design.In any case, you should also take into account that HF materials are more expensive than normal materials.It is best to consider the actual needs of the PCB and make an informed decision.

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Today's demand for high-frequency, high-speed PCB manufacturing is growing rapidly.As an experienced PCB manufacturer, GlobalChip focuses on providing reliable and high quality high frequency PCB prototypes to our customers.If you have any questions regarding PCB design or PCB manufacturing, please feel free to contact us.

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