Tech Updates

Tips for getting the best out of RFI and EMI Shielding

EMI shielding better known as Electromagnetic shielding puts barriers in order to limit the electromagnetic field in a given area. Magnetic or conductive material is used to make these barriers. Generally, electrical devices are covered with an electromagnetic shielding so as to limit the passing of electromagnetic waves into the outside world and causing disturbances. Cables are also covered with EMI shielding in order to keep apart the wires from the immediate environment from which they pass. RFI shielding is a popular form of electromagnetic shielding which aids in blocking the radio frequency from EMI radiation. The RFI and EMI shieldings need to be managed properly in order to prolong functionality. There are many troubleshooting practices that can be followed if there is a problem with the material as well as other management techniques that can help keep the shielding remain functional for a long time; some of them are mentioned below.Image result for RFI and EMI Shielding

Removing heat from the components inside the EMI/RFI lids/covers-
In case of heat issues, the heat inside the shielding cans can be removed with the help of ventilation holes along the top surfaces. It is also recommended that for better thermal practice higher power chips be used. Before attaching the EMI/RFI cover to the circuit board, the chip should be applied to it. Slightly higher temperature can help allow good flow to limit any trapped air gaps hence it is good practice to heat the lids to above 60 degrees before attachment.

Shielding gaskets-
A common concern amongst people regarding shielding gaskets is about the cost-effective methods for covers and other devices whilst dispensing and curing conductive rubber gasket compounds. In terms of material, form-in-place gasket placing is considered to be the most cost-effective but in terms of manufacturing, it is expensive. An alternative for form-in-place EM/RFI shielding gasket can be pre-form shaped gaskets with conductive pressure sensitive adhesives as a high volume.
The biggest reason behind ineffective gaskets in case of RFI shielding is the faulty RF gaskets, a problem that can be traced to faulty installation in most cases. It happens usually when a gasket is placed wrongly, where it wasn’t mean to go. In order to completely house a gasket, the gasket surface should ideally be conductive, rigid and recessed.

An EMI/RFI shielding leakage should always be treated with a conductive caulk.

See through design-
If a see-through window is required, a blackened mesh should be used.

3G Shielding specialities are well known for their EMI Shielding, PCB Shield, RF Shielding and Absorber. Since 1994, leading electronics companies have relied on 3G to deliver leading edge solutions for shielding advanced electronic applications. 3G is a service-oriented enterprise focussed on serving a global clientele. Led by client needs, their product portfolio has evolved from application specific board shielding to also include enclosure shielding, microwave absorbers, and thermal solutions.

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