Copper cladding is used to make electronic circuits board in PCB factory，Due to the use of the circuit, input/output signal frequency, waveform, etc.,it can be made into a variety of circuits, Such as high speed circuit, radio frequency circuit, high frequency circuit, microwave circuit, integrated circuit, digital circuit, analog circuit, etc. As a result, the industry has appeared different titles such as high frequency, high speed, microwave and other CCL and PCB. These concepts, both "familiar" and "vague," the industry does not have an exact definition. Therefore, it is necessary to clarify these concepts and related knowledge. The characteristics of HF PCB are mainly shown in the following aspects:

1.High signal transmission speed VS;
2.It has the characteristics of small transmission loss, short transmission delay time and small signal transmission distortion.
3, the dielectric performance is small, in addition, it can remain stable under the change of frequency, temperature, humidity and other environmental conditions.
4, with high precision control of characteristic impedance.