High Frequency Pcb

High frequency pcb is a special printed circuit board with high electromagnetic frequency. I used in the field of high frequency (frequency greater than 300MHZ or wavelength less than 1m) and microwave (frequency greater than 3GHZ or wavelength less than 0.1m) PCB. High frequency pcb is a circuit board produced by using a particular manufacturing method on a copper board.
Generally speaking, high frequency pcb can be defined as a circuit board with a frequency above 1GHz. The substrate material needs to have excellent electrical properties and good chemical stability. And with the increase of power signal frequency in the substrate, material loss requirements are very small, so the importance of high frequency pcb comes to the fore. Do you still want to know more about high frequency pcb? Please read this article in depth!
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Features of high frequency circuit board

High efficiency

High frequency pcb dielectric constant value is very small. The dielectric constant value will lead to delayed signal transmission. High frequency pcb with small dielectric constant, the loss will also be small. So high frequency pcb energy consumption is small, high efficiency. And advanced induction heating technology can achieve the target heating needs. Of course, the focus on efficiency and the characteristics of environmental protection are very suitable for the development of today’s society.

Fast speed

The value of high frequency pcb loss factor is much smaller. Scientific research shows that the transmission speed is inversely proportional to the square root of the dielectric constant. That is, the lower the dielectric constant, the faster the transmission speed. This is the advantage of high frequency pcb. It uses special materials not only to ensure the characteristics of the small dielectric constant but also to maintain the stability of operation, which is very important for signal transmission.
And High frequency pcb is the full range of signal performance. As the frequency of the transmission line increases, signal loss becomes more and more severe. But High frequency pcb reinforced epoxy or PTFE materials can provide a much lower loss factor, thus helping to reduce signal loss

The adjustable degree is large

High frequency pcb use widely in various industries. The high frequency pcb of precision metal material heating treatment needs, in its field of process, not only can realize the heating of different depth parts but also for the local characteristics of the key heating. high frequency pcb, whether surface or deep, centralized or decentralized heating method, can be easily completed.

Strong resistance

Dielectric constant and dielectric, the environment will have specific requirements, especially in the south, humid weather will seriously affect the use of circuit boards. High-frequency circuit boards made of materials with very low water absorption can challenge such an environment, but also has the advantage of resistance to chemical corrosion, moisture resistance, and high temperature as well as great peeling strength, so that high frequency circuit boards play a strong performance.

Materials for making high-frequency circuit boards

1.

When selecting the substrate used for PCBs for high-frequency circuits, pay special attention to the materials used. The standard circuit board material currently used in the market for many years is FR-4, a flame retardant type 4 woven glass-reinforced epoxy resin laminate. This material is very cost effective and easy to use, making it an ideal choice for manufacturers of high frequency pcb as FR-4 material. It is also a perfect electrical insulator and a robust material for printed circuit boards.
If there are a requirement for high frequency pcb in terms of signal transmission at high speed or characteristic impedance control requirements. In this case, the focus is on the DF and its performance under frequency, temperature, and humidity conditions. The choice of PCB board must be to meet the design requirements, mass production, cost in the middle to strike a balance. In simple terms, the design requirements include the electrical and structural reliability of the two parts. Usually, in designing a very high-speed PCB board (greater than GHz frequency), the board issue will be more important. For example, now commonly used FR-4 material, in several GHz frequency dielectric loss Df (Dielectricloss) will be very large, may not be suitable.The most common high frequency pcb are Rogers, Isola, Taconic, Dupont, and Megatron materials. All of these materials typically have low Dk and low loss.

2.

In terms of price, FR4 is the cheapest compared to dedicated high-speed materials and Teflon, with Teflon being the most expensive. However, the performance of FR-4 starts to degrade when the signal speed exceeds 1.6 GHz. Therefore, DK, Df, water absorption, environmental survivability, next-generation substrates, Teflon, and flexible circuits are the best choices.
If a printed circuit board requires frequencies above 10 GHz, next-generation substrates, Teflon, and Flex substrates are your best choices because they are far superior to traditional FR-4 materials. Another consideration for making high frequency pcb is the moisture absorption rate of the material used in the board. Even a tiny amount of moisture can change the electrical properties of a high frequency circuit. Traditional FR-4 can absorb up to 50% moisture, while materials such as PTFE can absorb as little as 2%. That’s why high frequency pcb manufacturers generally choose FR-4 materials first.
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Application of high frequency circuit board

If a printed circuit board requires frequencies above 10 GHz, next-generation substrates, Teflon, and Flex substrates are your best choices because they are far superior to traditional FR-4 materials. Another consideration for making high frequency pcb is the moisture absorption rate of the material used in the board. Even a tiny amount of moisture can change the electrical properties of a high frequency circuit. Traditional FR-4 can absorb up to 50% moisture, while materials such as PTFE can absorb as little as 2%. That’s why high frequency pcb manufacturers generally choose FR-4 materials first.
The most common high frequency pcb are Rogers, Isola, Taconic, Dupont, and Megatron materials. All of these materials typically have low Dk and low loss.
Printed circuit boards ( PCBs ) are an important part of today’s electronics industry. high frequency pcb provides connections to different components and assemblies for different circuits. High frequency rigid and flexible PCBs are used in many products and many industries, including
  • Mobile communication products
  • Satellite systems, radio systems
  • Military and aerospace
  • RF microwave
  • High density interconnect and highspeed design applications

Factors affecting high frequency circuit board

Many high-frequency plate procurement cycles are very long, even 2-3 months; in addition to conventional high-frequency plate RO4350 have stock, many high-frequency plates need to be provided by customers. Therefore, high-frequency plates need to communicate well in advance with the manufacturer to prepare materials as early as possible; look at the price sensitivity of the product, whether it is a consumer product, or communication, medical, industrial, military applications;
RF stands for radio frequency and is a form of energy that changes the time-dependent electromagnetic field. So another important factor is impedance matching. If the impedance is not matched, the signal will be distorted. The distortion rate is proportional to the change in impedance. When the signal enters the transmission line, the output signal matches the input signal if the impedance matches. So RF circuit and RS-485 communication protocol are some of the critical factors of high frequency pcb.
Each of these factors, high-speed digital circuit operation speed, is the main factor in the selection of PCB considerations. The higher the rate of the circuit, the smaller the selected PCBDf value should be. With a medium, low-loss board material will be suitable for 10Gb / S digital circuits; with a lower loss board for 25Gb / s digital circuits, the board will adapt to faster high-speed digital circuits with ultra-low loss, the rate can be 50Gb / s or higher.

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