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How to Control Radiated EMI Through PCB

by: Mar 19,2014 813 Views 0 Comments Posted in Engineering Technical

PCB Printed Circuit Board(PCB)

All electronic devices, such as cell phones and televisions, contain one or more Printed Circuit Boards (PCBs). PCBs have electronic components that are connected together through thin copper traces. When such a PCB is operating, electrical currents constantly travel between different components through copper traces. These changing currents produce Electromagnetic Interference (EMI), which can affect the performance of the circuit and of any other electronic device in the vicinity of the circuit. Furthermore, some electronic components themselves produce EMI. One can take some simple steps to control the propagation of EMI from PCBs.


1 Measure the lengths and widths of all electronic chips on the PCB using a ruler. Cut the EMI patches in these dimensions using scissors. Peel off the protective patch at the back of of the patches and stick the patch on the corresponding chip on the board. Repeat this process to install the remaining EMI patches on the chips.

2 Install the PCB inside the metallic box using screws that came with the box. Run the wires connected to the PCB through holes in the box.

3 Wrap individual wires coming out of the box with copper tape to reduce the EMI emission from the wires. If two or more wires are twisted together, do not untwist them and wrap them together with the copper tape.

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