Three Common Options for EMI RFI Shielding Materials

You have many options to consider when determining EMI RFI shielding material. No two materials offer the same benefits, so you must choose materials based on your application's exact specifications. EMI and RFI shielding need to be constructed to the highest standards because these shields are used as life-saving medical and military equipment. Below, we want to highlight three popular metals used to construct EMI RFI shieldinging.

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Pre-tin plated steel is a great option when the cost is a factor. This metal is also highly suitable for low frequencies (kHz range through GHz range). Tin plating is ideal when corrosion protection protects the steel from rusting while also maintaining great solderability on the surface. IT is easy to attach EMI shielding to the trace on the surface board during assembly.

Copper is arguably the most reliable metal to choose from for EMI and RFI shielding. Compared to other materials, copper stands out as an effective material for attenuating electrical and magnetic waves. Copper is often found in medical equipment, like MRI devices. They are used in personal and business computers. Copper is a versatile metal that can be fabricated along with other alloys (brass, bronze, beryllium copper, and more). It is important to keep in mind that copper is an expensive option compared to other common materials.

EMI RFI Shielding

Copper Alloy 770 is also commonly referred to as nickel silver. It is a copper alloy composed of copper, zinc, and nickel. Copper alloy 770 is most known for its corrosion resistance. For EMI shielding, the material works best in mid frequencies between kHz and GHz. Permeability for this alloy is one that allows it to be an MRI-related application where magnetic materials are not permitted.

Tips for Choosing Shielding Materials

EMI and RFI shielding are essential components of modern-day electronics. There is no electronic device on the markets, whether it is a navigation system or a medical device that isn&#;t directly affected by EMI. To meet the ever-changing demands of the electronics industry, EMI and RF shielding are constructed from different materials. How do you know which one is right for you? Below, we want to go over some of the most used materials and their differences. Hopefully, this makes designing easier for you.

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Tin plating is commonly used because it offers exceptionally high corrosion protection to prevent rusting. It is also known to have great solderability across the entire surface, which makes it easy to attach the shield to different traces on the surface board.

Pre-tin plated steel is probably your best low-cost solution that does not compromise on performance. It works well in lower KHz range frequencies, as well as lower frequencies within the GHz range. Carbon steel is known to have a permeability value that is in the low hundreds range. This provides low-frequency magnetic shielding that is not matched in other materials like aluminum, alloy 770, and copper.

Copper is incredibly reliable. This is especially the case when working with radio frequencies. Copper absorbs both magnetic and radio waves. It is one of the best materials for attenuating electrical and magnetic waves.

EMI RFI Shielding

Copper alloy 770 is commonly referred to as alloy 770. It is a mixture of nickel, copper, zinc alloys. This alloy has the best corrosion resistance properties of all other RFI shielding materials.