In the world of electronic devices and systems, EMC (electromagnetic compatibility) and RF (radio frequency) shielding are key factors that ensure devices operate correctly and safely. But what do these terms mean, and why is it important to understand them?
What are EMI, EMC and RF shieldings?
EMC refers to the ability of electronic devices to operate together without causing interference. This means that devices must not interfere with each other or their environment through electromagnetic waves. EMI focuses on preventing interference, EMC ensures a device can function in the presence of interference, and RF relates to electromagnetic waves used in communication, which can also cause interference.
The growing need for shielding
The increasing number of electronic devices, the rise of wireless technology, industrial automation, and poorly shielded equipment all contribute to EMC issues. Megatrends such as electric vehicles, 5G infrastructure, IoT, and the growth of data technology are driving the need for more shielding. This need spans industries such as electronics, data and telecommunications, construction and installation, aerospace and defense, manufacturing, energy, automotive, and medical technology.
Why are EMC and RF shielding important?
- Functionality: Without proper EMC and RF shielding, devices can interfere with each other, leading to malfunctions.
- Safety: Interference can cause hazardous situations, especially in critical systems such as medical devices.
- Data protection and anti-espionage: Shielding prevents data leaks via electromagnetic interference, protects devices from intentional radiation, and ensures the privacy of sensitive information.
- Regulations: Electronic devices must meet specific EMC and RF shielding standards.
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How do EMI, EMC and RF shielding work?
EMC shielding works by blocking electromagnetic radiation. Electrical interference energy can travel from the source to the target through conduction or radiation. Interference can be prevented with grounding, blocking radiation (e.g., Faraday cages), and using conductive gaskets and materials. Shielding or sealing targets may include components, cables, enclosure gaps and openings, such as doors, panel meters, displays, connectors, and switches.
How to get started with shielding?
- Learn the basics: Understanding key concepts and terminology helps you grasp why shielding is important and what to consider.
- Consult experts: EMI, EMC, and RF shielding can be complex, with a wide product range and many options. Experts can provide valuable information, guidance, alternatives, and methods.
What to consider when choosing shielding
It’s best to consider EMC requirements as early as possible, ideally during the design phase. Early planning allows you to account for the device’s operating environment, interference sources, and shielding options, which helps select effective solutions and reduces the need for costly redesigns.
- Placement and application:
Options range from PCB-level components to modular and final enclosures. Enclosures can vary from small devices to large cabinets and even rooms or buildings. - Mechanical and environmental conditions (dust, humidity):
Suitability, model, size, material, compressibility, and chemical/galvanic compatibility are all important. - Shielding effectiveness (standards and compliance):
EMC shielding is measured and defined using coupling impedance (milliohms, mΩ/m) and/or shielding attenuation (decibels, dB).
Shielding options
The range of shielding products is broad. Various materials, designs, and methods are available for different environments and applications.
Amitronic provides gaskets and shielding materials for electronic equipment. Our selection includes conductive gaskets from several suppliers, such as spring finger gaskets, conductive fabric-over-foam gaskets, conductive elastomers, metal mesh gaskets, honeycomb vents, shielding meshes, and RF-shielded windows. Materials include beryllium copper, tin, nickel/copper, silver, aluminum, silicone, fluorosilicone, and more.
Contact us!
We are happy to help with any EMC shielding-related questions, problems, or needs. Contact our sales team, and we’ll find the right EMC shielding solution for you.
Also check out our previous news:
Aluminum Honeycomp Air Ventilation Panels – Amitronic
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Kemtron Elastomeeritiivisteet – Amitronic (In Finnish)
