PCB News - Do you know what a high frequency mixing board is

Do you know what a high frequency mixing plate is？

As high frequency RF (radio frequency) and PA (power amplifier) and other high-power electronic components have higher requirements for PCB heat dissipation capacity, the industry began to introduce the manufacturing process of embedding copper block in PCB, which is called embedded copper plate. At the same time, in order to save the material cost of high-frequency materials, only the RF circuit part is designed to be mixed with high-frequency materials, At present, most of the products are combined with two processes at the same time. The high-frequency material and heat dissipation copper block after the single-sided circuit is fabricated are embedded after lamination. At the same time, the heat dissipation copper block also needs to be machined to produce the corresponding power amplifier element placement slot.

In order to improve the adhesion between the copper block and the PCB core board, the size of the directly embedded copper block generally needs to be slightly smaller than that of the copper insert groove, that is, the gap between the side wall of the copper block and the side wall of the copper groove is matched, so that the film can fill the gap between the side wall of the copper block and the side wall of the copper insert groove during the pressing process, so as to improve the adhesion between the copper block and the PCB core board. Even so, if the copper block is one-sided pressed, that is, the top surface of the copper block is pressed with the film, and the bottom surface of the copper block is exposed, the bare bottom surface of the copper block has no support. Relying only on the adhesion of the top film and the adhesive in the gap, the copper block is easy to loose and fall off. At the same time, because the gap between the side wall of the copper block and the side wall of the copper insert groove is matched, the glue is squeezed into the gap during the pressing process, which may cause the copper block to move horizontally and deviate from the center position.

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