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High Frequency PCB

What is High Frequency PCB

High-frequency board refers to a special circuit board with a higher electromagnetic frequency. It is used for high-frequency (frequency greater than 300MHz or wavelength less than 1 meter) and microwave (frequency greater than 3GHZ or wavelength less than 0.1 meter). The copper board is a circuit board produced by using part of the process of the ordinary rigid circuit board manufacturing method or using a special processing method. Generally speaking, a high-frequency board can be defined as a circuit board with a frequency above 1GHz.

high frequency pcb

With the rapid development of science and technology, more and more equipment designs are applied in the microwave frequency band (>1GHz) and even in the millimeter wave field (30GHz). This also means that the frequency is getting higher and higher, and the requirements for materials are also getting higher and higher. For example, the substrate material needs to have excellent electrical properties, good chemical stability, and the loss on the substrate with the increase of the power signal frequency is very small, so the importance of the high-frequency board is highlighted.

Features of PCB High Frequency Board

  • The impedance control requirements are relatively strict, and the relative line width control is very strict, with a general tolerance of about 2%.

  • Due to the special plate, the adhesion of PTH copper is not high. It is usually necessary to roughen the via and the surface with the help of plasma processing equipment to increase the adhesion of PTH hole copper and solder mask ink.

  • Do not grind the board before doing solder mask, otherwise the adhesion will be poor, and only use micro-etching potion to roughen it.

  • The plates are mostly polytetrafluoroethylene materials, and there will be a lot of burrs when forming with ordinary milling cutters, and special milling cutters are required.

  • High-frequency circuit boards are special circuit boards with higher electromagnetic frequencies. Generally speaking, high-frequency can be defined as frequencies above 1GHz.

high frequency pcb

High-frequency boards have very high requirements for various physical properties, accuracy and technical parameters, and are often used in automotive anti-collision systems, satellite systems, radio systems and other fields.

Applications of PCB High Frequency Board

  • Mobile communication products, intelligent lighting system

  • Power amplifier, low noise amplifier, etc.

  • Passive components such as power splitters, couplers, duplexers, filters, etc.

  • automobile collision avoidance systems, satellite systems, and radio systems.

The high frequency of electronic equipment is a development trend, especially with the increasing development of wireless networks and satellite communications, information products are moving towards high speed and high frequency, and communication products are moving towards the standardization of voice, video and data for wireless transmission with large capacity and speed. Therefore, the development of a new generation of products requires high-frequency substrates. Communication products such as satellite systems and mobile phone receiving base stations must use high-frequency circuit boards. In the next few years, they will inevitably develop rapidly, and high-frequency substrates will be in large demand.

Difficulties in High-frequency Board Processing

  • Immersion copper: the hole wall is not easy to be copper.

  • The control of etching, line track and width.

  • Solder mask adhesion, and foaming control.

  • Strictly controlled board surface scratches in each process, etc.


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