medicine and aeronautics to benefit from smaller and lighter equipment that has allowed them a high degree of development and effectiveness. Today, HAL in our house, almost every electronic device that helps us in the household contains a larger or smaller printed circuit: refrigerator, vacuum cleaner, television, but also for general use: telephone, computer.
current the conductor will carry. It is recommended that the power and force paths be larger than the signal paths. In a multi-layer board, an internal layer may be mostly solid copper to act as a ground plane for shielding and power return. For microwave HAL printed circuits, transmission lines can
much higher component density because the component paths on the inner layers would occupy the space between the components. HAL The increase in the need for multilayer printed circuit boards with more than two, four and especially more than six layers of copper has been concurrent with the adoption of surface mount technology. "Through holes"