What is a high frequency PCB board
Nov 17, 2022
High-frequency PCB is a special circuit board with high electromagnetic frequency, and the high-frequency frequency is above 1GHz. High-frequency PCBs have very high requirements on physical properties, precision, and technical parameters, and are often used in radar, military equipment, aerospace and other fields.
First of all, let's take a look at what materials are used to make high-frequency PCBs? The performance of high-frequency boards in wireless or other high-frequency applications depends on the building materials. For many applications, dielectric properties can be improved by using laminated FR4 materials. When manufacturing high-frequency PCBs, commonly used boards include Rogers, ISOLA, Taconic, Panasonic, Taiyao and other boards.
The DK of high-frequency PCB should be small and stable, usually the smaller the better, high-frequency PCB will cause signal transmission delay. DF should be small, which mainly affects the signal transmission quality. A smaller DF can reduce the signal loss accordingly, and in a humid environment, the water absorption rate is low and the water absorption capacity is strong, which has an impact on DK and DF.
The thermal expansion coefficient of the high-frequency circuit board needs to be the same as the copper foil as much as possible, because the high-frequency circuit board may cause the copper foil to separate under the condition of alternating cold and heat, and it should be the same as the copper foil as much as possible so as to ensure the high-frequency circuit board. Performance can be played perfectly. High-frequency PCB has the characteristics of heat resistance, chemical corrosion resistance, impact resistance, and good peeling resistance.
High frequency PCBs are generally used in radar systems, satellites, antennas, cellular telecommunications systems – power amplifiers and antennas, direct broadcast satellites, E-band point-to-point microwave links, radio frequency identification (RFID) tags, airborne and ground radar systems, millimeter wave applications, Missile guidance system, space satellite transceiver and other fields.
With the rapid development of science and technology, the functions of equipment are becoming more and more complex, and many equipment are designed in the microwave frequency band or even exceed the millimeter wave. This also means that the frequency continues to increase, and the requirements for the substrate of the circuit board are also getting higher and higher. As the frequency of the power signal increases, the loss of the base material is required to be very small, so the importance of high-frequency boards is highlighted.
