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General Information of High Frequency PCBs
Have you ever heard of high-frequency PCBs? They are printed circuit boards produced by high-frequency laminates. They are typically used in radar, satellite communication, high-speed data acquisition and signal processing systems, high-speed digital networks, and more.
High-frequency PCBs require specialized design and fabrication processes beyond standard PCB production techniques. They call for high precision in alignment, copper plating, and high-temperature soldering of high frequency components. Designers must consider the high frequency electrical performance requirements imposed by high-frequency applications to produce high-quality boards that meet the desired performance standards.
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Viasion is trusted high frequency PCB manufacturer more than 16 years of experience, please contact us any time for a free High Frequency PCB Quote.
Viaison has an efficient and dedicated group of technicians, engineers and sales staff with extensive practical experience in manufacture high-frequency PCBs.
Viasion continues to strengthen internal scientific management, the use of advanced production processes and establish a comprehensive quality assurance system, which provides a reliable guarantee for high frequency printed circuit board.
We have many years of experience in the production of high frequency PCBs so we can buy all kinds of high-frequency materials at low cost. Besides, our engineering and production team will help us to get the best yield rate. So we can quote competitive prices.
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Material Requirements of High Frequency PCB
Classification of High-Frequency Material
Key Production Points for High Frequency PCBs
How to Choose Materials for High Frequency PCB?
The following are tips on how to choose materials for High Frequency printed circuit. Please note the material will greatly affect the high frequency PCB manufacturing price.
2.4 GHz Spread Spectrum Digital Microwave PCB materials are high-frequency printed circuit board materials that enable high-speed digital signal transmission for wireless communication applications up to 2.4GHz. They provide excellent electrical performance, high-temperature stability and low loss characteristics over a wide frequency range from 1GHz to 6GHz.
These materials also offer good dimensional stability, high thermal conductivity and dielectric strength, making them an ideal choice for high-speed microwave designs in the mobile phone industry and other RF/microwave applications such as satellite communications and radar systems.
For power amplifiers, use PTFE material, make as double layers PCB; For RF transceivers, use PTFE material, make as four layers PCB. Both use large area ground wire laying, and functional modules use shield cover isolation measures.
The top layer uses 0.3 mm S1139 material, a large area of ground wire laying, via isolation.
Use FR-4 material, and make four layers. Large area ground wire laying, functional module isolation strips use a string of vias to isolate.
Use RO4350 material, make as double layers PCB, large area ground wire laying, spacing constraint ≥ 50-ohm line width, shielded with metal boxes, power input filtering.
Use 0.8 mm thickness S1139 material to make a double-sided PCB.
The Advantages of High Frequency PCBs
High-Speed PCB VS High-Frequency PCB
High-speed PCB Introduction
High-speed PCB refers to the high-speed signal transmission PCB, and the information below will help you understand what high-speed signal transmission is:
- Any signal over 50 GHz is a high-speed signal.
- Whether the signal is high speed is not directly relative to the frequency, but when the rising/falling edge of the signal is less than 50 ps, it’s considered a high-speed signal.
- When the transmission path length of the signal is more excellent than 1/6, a signal is considered a high-speed signal.
- When the signal transmission follows the transmission path, and severe skin effects and ionization loss occur, the signal is considered a high-speed signal.
The connection between high-speed PCB and high frequency PCB
Does high speed equal high frequency?
Not really, but the rising frequency will bring a high-speed problem. It is a sufficient condition rather than a necessary condition. We can not judge if it’s a high-speed signal only by frequency, but we should analyze the high frequency weight it contains, actually the edge velocity.
The difference between the characteristics of high-speed PCB and high frequency PCB
|Characteristics of high-speed PCB||Characteristics of high-frequency PCB|
High-speed PCB products focus more on the material’s dielectric loss ( Df ). The high-speed materials commonly used in the market are also divided grade according to the big or small dielectric loss. Therefore, the difference substrate material will split into five corresponding levels of transmission signal loss: conventional loss, Medium loss, Low loss, shallow loss, and Ultra-low loss according to the substrate material’s dielectric loss ( Df ).
Based on the information mentioned above, Some may conclude that “High-frequency materials differ in paying attention to the changes in dielectric constant (Dk) from high-speed materials. Is that right? “Right! High-frequency PCB products are prone to be impacted by the dielectric constant ( Dk ) change of material.
So the critical points of high-frequency materials are the stability of the dielectric constant ( Dk ), the material substrate thickness, the temperature drift coefficient of the material and the stroboscopic properties of materials.
Therefore, there need to be clear classification standards for high-frequency materials in the industry. Still, many PCB manufacturers had roughly classified high-frequency PCB according to the material’s dielectric constant ( Dk ). Therefore, those materials with the same dielectric constant ( Dk ) is considered similar and can substitute each other.
There is also a customary way of division in the high-frequency material field: divide the material into PTFE material and Non-PTFE material. It is closely related to the application field of high-frequency products. The current RF field can be divided into two parts. One is the commonly used frequency under 6 GHz. They are 3.5 GHz, 2.7 GHz, and 1.8 GHz. The main products are power, amplifier, Antenna calibrator etc.
The other part is the frequency over 20 GHz commonly used in a millimetre wave field. They are 24 GHz, 66 GHz, and 77 GHz. Mainly products are Radar products. And why division of material into PTFE material and Non-PTFE material is because with the increase of frequency, the influence of stroboscopic effect and dielectric loss on the signal transmission of Non-PTFE material will increase sharply, but PTFE material has better performance characteristics.
High Frequency PCB Design Principles
High-frequency PCB design requires understanding the fundamentals of high-speed electrical signals, radio frequency (RF) energy, transmission line effects, parasitic elements, and more. When designing high frequency PCBs, it’s essential to consider the following high-frequency PCB design principles:
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Frequently Asked Questions
High frequencies are achieved in PCBs through careful design and construction of the board, including the layers, trace widths and stack up, and material selection.
The testing methods required for high-frequency PCBs are as follows.
1. Electrical Test for Open and Short
2. Automated Optical Inspection
3. TDR impedance testing
4. Functional Testing
5. Solderability testing
6. Thermal Testing
7. Tape Test for Solder Maks
8. Peel Test for Conductors
1. The choice of the material requires careful consideration.
2. The layout of high frequency PCB must be carefully optimized to prevent signal degradation.
3. High frequency components are susceptible to environmental factors such as temperature and humidity, so manufacturers must take special care when fabricating them.
4. Very experienced engineering and production team is needed to produce high-frequency PCB since it always needs very tight tolerance in PCB thickness, trace width and space, copper plating thickness, etc.
To get a high frequency PCB manufacturing price, we need Gerber files and the quality you need. Please make sure the material type are included in the package. When you have a high frequency PCB manufacturing or RF PCB manufacturing demands, please free to contact our sales team anytime.