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Blank PCB, also known as bare PCB or empty PCB, is an electronic board made by laminating epoxy glass fiber, copper foil, and PCB ink.
A blank PCB is an empty circuit board without any components installed to create a functional circuit board. Blank PCB boards are sometimes referred to as "copper clad" circuit boards because there is a layer of copper coating around the circuit board.
Blank PCB boards have a non-conductive prepreg or polymer layer and solder film between the substrate, copper wire, and copper wire. Copper wires in different layers are connected by copper filled holes.
Blank PCB boards are used to build custom passive filter circuits. They are designed to be installed in electronic component casings to provide a layout with three holes in one group, or PCBs with multiple sets of series components. Each group of components has five sizes and parallel wound components.
Types of blank printed circuit boards
1. FR-4
The FR4 PCB is the most common blank PCB. FR4 is not a material, but represents level 4 flame retardancy. FR4 PCB is actually an epoxy glass fiber PCB with a fourth level flame retardant rating. The pre impregnated layer between the copper layers is also epoxy glass fiber, but it is semi cured.
FR4 blank PCBs are easy to manufacture, and FR4 PCBs are cheaper than other PCBs with the same number of layers and circuit complexity.
2. Metal core PCB
Metal core PCBs include aluminum core PCBs and copper core PCBs. Metal PCB substrates have much better thermal conductivity than FR4 cores, and metal core PCBs are mainly used for LED lighting and other power applications.
3. Rigid-Flex PCB
Flexible PCBs and rigid-flex PCBs are PI or PET-based blank PCBs that can bend. Rigid-flex PCBs are special flexible PCBs because their flex section is laminated with FR4 PCB layers.
4. High Frequency PCB
A high-frequency PCB is also a high-speed and RF microwave PCB. It is a PTFE-based blank PCB that transmits and receives high-frequency signals. High-frequency PCBs can be used for antennas, radars, anti-collision systems, GPS, smartphones, missile systems, etc.
How to make a blank PCB?
When designing PCB wiring, the following principles should be followed: separating analog signals from clock signals, maintaining a line angle greater than 135 °, maintaining the same line width in the same network, and keeping the line as short as possible.
When completing PCB design, it is necessary to ensure that the PCB has uniform impedance, low electromagnetic interference, and manufacturability.
The main function of a blank PCB board is to provide physical support for the circuit board, as well as the installation location and connection points of components.
