What is Electromagnetic Compatibility?

Electromagnetic compatibility (EMC) describes the ability of an electronic device to operate as intended in its environment without interfering with other devices. Controlling electromagnetic interference (EMI) is an integral part of the development of any electronic device. By law, products must comply with international EMC standards, which regulate EM emissions and the susceptibility of commercially available electrical and electronic systems. A successful product must strike a balance between EMC and competing design requirements such as size, cost and performance. Finding this balance can pose major challenges to engineers. The earlier we can identify a potential EMI problem, the less disruption it causes to the design process. By including EMC-compliant design at an early stage, additional costly development iterations can be avoided later on.

EMC Certification

Electromagnetic compatibility (EMC) regulations ensure that devices must not emit electromagnetic fields that can disrupt other electronics. Devices must also be able to withstand electromagnetic interference(EMI) from nearby devices and from environmental electromagnetic effects (E3) such as lightning strikes or electromagnetic pulses. To ensure compliance with these regulations, electronics products must undergo EMC testing and certification before they can be sold on the market. Certification not only demonstrates compliance with regulations but also assures customers that the electrical system will function properly in an electromagnetic environment.

Benefits of Early EMC-Compliant Design

By including EMC-compliant design at an early stage, engineers can save time and money by avoiding costly development iterations later on. It also allows for better overall design optimization as any potential EMC issues can be identified and addressed early on in the design process.

How can simulation help with EMC?

Electromagnetic simulation gives engineers a detailed view of all EMC-relevant aspects of a device – from the flow of currents across a circuit board, to the propagation of fields between co-site antennas. It helps them identify and resolve potential problems before testing. This not only cuts development time and costs, but can also reduce the risk of failing regulatory EMC testing, according to various standards such as MIL-STD. SIMULIA’s simulation portfolio includes a range of specialized tools for interference and EMC analysis, powered by fast, accurate 3D solvers.

EMC Software Applications:

  • EMC Rule Checking
  • EMC virtual testing
  • Co-site interference analysis
  • E3 - Electromagnetic Environmental Effects
  • Cable harness simulation

With CST Studio Suite technology, the relevant EMC categories emissions and susceptibility can be studied. It also enables the investigation of system-level effects, either by its sheer ability to tackle very large and complex set-ups efficiently or by hybridization between the most appropriate solvers, dedicated to a certain problem class, such as cables for example.

EMC/EMI Applications

Simulation of Crosstalk and De-sense in a Mobile phone

This interactive infographic uses short videos to explain the electromagnetic compatibility (EMC) and signal integrity (SI) issues affecting the design of a mobile phone.

USB 3.2 offers data speed up to 20GBit/s. These fast signals create broadband noise that can affect other electronic systems even at radio frequencies (RF) and often leads to RF de-sense and crosstalk.

Electromagnetic simulation can be used to analyze the distribution of currents and electromagnetic fields inside devices, showing how they propagate and identifying the coupling paths that can cause interference issues. With this information, engineers can improve the routing of traces and add interference mitigation components such as via fences.

crosstalk in a mobilephone > Dassault Systèmes

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FAQ about EMC & EMI

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