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What Is The Difference Between A High Frequency Board And A Low Frequency Board?

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Frequency Range and Application:

High frequency boards usually refer to special circuit boards with higher electromagnetic frequencies, which are often defined above 1GHz. Because of its physical properties, precision and technical parameters require very high, high-frequency boards are widely used in automotive collision avoidance systems, satellite systems, radio systems and other highly demanding areas of frequency and transmission speed.

Low-frequency boards, on the other hand, are mainly used in specific technical fields in the lowest frequency range, such as the radio band in the range of 30 to 300 kHz. In electronic amplifier circuits, frequencies close to audio (20 Hz to 20,000 Hz) are also called low frequencies. Low frequencies play an important role in the field of sound and are the foundation and thickness of sound.

Circuit Design and Components:

The high frequency board circuit design must include an LC frequency-selective network, while the low-frequency board circuit has no such requirement. In addition, the high amplifier circuit in the HF board operates in Class C, where only part of the signal is amplified and must be frequency selected by a frequency selector network.

From the perspective of the components on the board, high-frequency boards usually have a capacity of a few P to dozens of PF capacitors, most of which will also be equipped with air-core coils, and some of them will have transmission lines and antennas. On the other hand, low-frequency boards seldom have capacitance below nF, except for crystal capacitance.

Board Characteristics and Processing:

High-frequency boards require strict impedance control and very precise line width control. Most of the plates are made of special materials, such as PTFE, which need to be processed with special milling cutters. In the manufacturing process, in order to improve adhesion, often with the help of plasma processing equipment, etc. on the over-hole and surface roughening treatment.

Low-frequency plate is relatively low in these requirements, the plate and processing may be different from the high-frequency plate.


There are significant differences between high-frequency and low-frequency plates in a number of areas:

Uses and Characteristics:

High Frequency Plate:


High-frequency boards, also known as high frequency circuit boards, are a type of substrate for electronic components that are primarily used in high-frequency and microwave electronic equipment. These include high-frequency devices such as telecommunications, radar, satellite communications and antennas.


The HF board has excellent high frequency performance and is capable of operating in the RF and microwave frequency bands. It is made of low-loss materials to minimize energy loss during signal transmission and ensure high-quality signal transmission. It also has superior insulating properties, stable dielectric constant and high temperature resistance. However, the manufacturing process for HF boards is very demanding and requires precision machining and special material treatment.

Low Frequency Board:


Low frequency board is usually used in interior decoration, machine and equipment surfaces, electrical wire outer sheath and other fields. It is a softer material, easy to process and weld, and lower cost, so it is widely used in various fields.


The surface of low-frequency aluminum plate is smooth, and there is no obvious convex or concave pattern on the surface.


High frequency board is a special circuit board with high electromagnetic frequency, used in the field of high frequency and microwave. It is a circuit board produced by utilizing part of the process of ordinary rigid circuit board manufacturing method or using special treatment methods on the copper-clad laminate of microwave substrate.

Low-frequency boards, on the other hand, may have different structures and manufacturing methods, but the specific details need to refer to the relevant professional information.

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