Electricity and magnetism are closely associated as the flow of current in a device forms an electromagnetic field around it. Also, a rotating magnetic field produces electric signals. However, the signals coming from two or more electronic devices in close vicinity produce EMI or electromagnetic interference, by mixed signals in each other’s spaces. This can disrupt the circuit and even damage the devices, and hence this noise needs to be eliminated or reduced. This is especially important for different circuits on a single printed circuit board. There are increasing concerns regarding EMI in circuit boards because of compact size, multiple components mounted on the board, and complex wiring and design.. EMI can hamper the function of these circuits and subsequently any device where they are embedded. Hence, it is often necessary to incorporate a protective shield on the board to protect it from the effect of internal or external EMI. A Faraday cage is one such solution that shields the circuits by creating a barrier between the mounted components inside and the electromagnetic field produced outside the board. Likewise a Faraday cage can be used to limit the EMI created by a circuit. This post discusses the role of PCB Faraday cage in reducing EMI.
Working of PCB Faraday Cage
Regardless of the advancements in PCB design and component mounting technologies, EMI issues may occur. So, using a Faraday cage helps prevent any noise and radiation from the internal components to escape to the outside environment while also protecting the circuits on the board from any external EMI sources. However, it proper PCB design allows intended signals to pass. This facilitates seamless functioning of the PCB circuit. A Faraday cage is typically a metallic enclosure on the board. It helps prevent EMI related interruption, especially in applications where there are multiple and complex PCBs or parts that also work as antennas.
Tips to Reduce EMI Using PCB Faraday Cage
Here are some pointers regarding PCB Faraday cage that will help eliminate EMI in circuit boards.
- Made of any commonly used conductive metal, Faraday cage is electrically connected to the PCB. To be effective, the shield must be designed for the frequencies encountered. This design must consider holes, edge folds and solder joints because these are places EMI can leak from the shield.
- Heat dissipation is an important aspect in any electronic device. So, this cage may need to have a ventilation system or open points that facilitate exchange of air. However, these holes or open spaces must be small enough to allow only air passage and prevent EMI leakage.
- At times, the PCB may need to be opened, so the shield may have to be desoldered or have other attachment means that facilitate removal and reapplication.
Are you an OEM that manufactures advanced and miniature electronic or electromechanical devices with complex PCBs? If yes, incorporating PCB Faraday cage as a shield for your boards could be necessary to protect the functionality of your products. Ensure you partner with a reliable PCB Faraday cage manufacturers and suppliers. XGR Technologies is an expert player with plenty of experience in board level shielding solutions. If you need any further information regarding their SnapShot® EMI shields or have specific application requirements, you can contact the team of experts at XGR Technologies via phone or email.