Using EMI-RFI Shielding Gaskets and Filters

When should you use an EMI shield instead of an EMI filter? Both devices are invaluable tools for drastically reducing electromagnetic interference. Depending on your device and how it is being used, you should be able to pick a type of EMI protection that meets your needs. In many cases, engineers use filters and shields to create effective solutions.

Because of holes and gaps in shielding, EMI protection can have reduced effectiveness. Please keep in mind that these holes are a necessary part of shielding because they allow for adequate heat reduction. If electromagnetic interference protection is not enough with EMI shields, you may also need to incorporate in addition shields.

What is the main difference between a shield and a filter?

Use shields to solve a wide range of EMI problems effectively. EMI shields adequately reflect electromagnetic interference.

Use filters to eliminate EMI. EMI filters address issues that are related to penetrations through the shield. They are also used at the outputs and inputs of electrical systems, which are widely known as the most vulnerable points of a shield.
It is helpful, for eliminating EMI noise, to place filters/connectors at the system’s output and input interfaces. Putting filters in these areas sends unwanted energy to grounded shields. This is an optimal location in eliminating noises while also mitigating other EMI problems.

To get a better understanding of how filters and shields can work for your electoral devices, you should give our team a call.

EMI RFI Shielding

• Important RF Shielding Terminology
  The more an individual spends learning about electromagnetic interference and EMI shielding, the more likely they are to design enclosures the protect their devices.
• Tips for Choosing Shielding Materials
• Using EMI-RFI Shielding Gaskets and Filters