This passage is about PCB concept.

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HDI boards are generally manufactured using a lamination method.

CB can be used more and more widely because it has many unique advantages,PCB has some other advantages, such as miniaturization, light weight, and high-speed signal transmission.

The characteristics of high frequency PCB are as follow

The BT PCB is a PCBA board with integrated Bluetooth function for short-distance wireless communication. It is divided into Bluetooth data module and Bluetooth voice module according to function. The Bluetooth module refers to a collection of basic circuits of chips that integrate Bluetooth function......