The double-sided PCB (double-layer/double-sided printed circuit board/breadboard) is more complicated than single sided PCB. The circuits on both sides are connected through the middle Various types of double-sided PCB are on the market, such as double sided copper clad PCB, high Tg thick copper foil PCB, high-frequency PCB, and hybrid dielectric base high-frequency double-sided PCB. Double-sided PCBs are widely used in high-tech industries like telecommunications, power supply, computers, industrial control, digital products, scientific and educational equipment, medical equipment, automobiles, aerospace defense.