Do you know the advantages of PCB pouring copper on the surface of the PCB? In the whole process of PCB design, engineers want to ignore the link of pouring copper on the bottom of the PCB in order to save time. Is this right? Is it necessary for the PCB to pouring copper on the bottom of the surface? What are the advantages of copper on the bottom of the PCB?
First of all, we need to be clear: the copper on the bottom of the surface is beneficial and necessary for the 5G antenna PCB, but the copper on the whole board needs to comply with some conditions.
Advantages of pouring copper on the bottom of the PCB:
From the EMC point of view, the whole board is covered with copper on the bottom of the surface, which provides additional shielding protection and noise suppression for the inner signal, and also has a certain shielding protection for the components and signals on the bottom of the surface.
Reminder: For two-layer boards, copper pouring is necessary
The condition of copper pouring on the bottom surface.
Although pouring copper on the surface and bottom layer is good for 5G antenna PCB, it also needs to follow some conditions:
1.Pouring copperby hand at the same time as much as possible, do not cover it all at once, avoid broken copper skin, and properly add via holes in the copper paving area to the ground plane.
Reason: The surface copper-clad plane must be separated by the surface components and signal lines. If there is a poorly grounded copper foil (especially the thin and long copper), it will become an antenna and cause EMI problems. .
2. Consider the small foot print, such as 0402 0603 and other small packages, to avoid tombstone effect.
Reason: If the whole board is covered with copper, if the component pins are fully connected with copper, the heat will be lost too quickly, and it will be difficult to desolder and rework.
3.It is best to pour copper tothe whole board continuously. The distance from the ground to the signal needs to be controlled to avoid discontinuity in the impedance of the transmission line.
Reason: The copper skin that is too close when laying the ground will change the impedance of the microstrip transmission line, and the discontinuous copper skin will also cause a negative impact on the impedance discontinuity of the transmission line.
4.Some special situations depend on the application scenario. PCB design should not be an absolute design, it should be weighed and used in conjunction with the theories of all parties.
Reason: In addition to sensitive signals that need to be grounded, if there are many high-speed signal lines and components, a lot of small and long copper fragments are generated, and the wiring channels are tight, it is necessary to try to avoid the surface copper skin to be connected to the ground plane through holes. thennot to pour copper on the surface
The above are the advantages of pouring copper on the surface of the PCB board, I hope to help you.
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