Introduction The European EMC Directive (2014/30/EU) was updated in 2014, replacing the old directive (2008/108/EC) and became mandatory from April 2016 for any new product entering the EU from that date onwards. The change of directive was aimed at aligning the wording and terminology to ensure it was consistent with other CE Marking directives and implement standard text … [Read more...]
Cost-Effective Applications of EMI Gaskets
Introduction EMI gaskets are used extensively by the electrical/electronic industry to assist in complying with the various EMI radiated emission requirements. These requirements include compliance to DoD TEMPEST and EMI, and FCC and EU EMI test limits. As a rule of thumb the radiated emission TEMPEST requirements are about two orders of magnitude (40 dB) more stringent than … [Read more...]
Measuring Shielding Effectiveness with Two Near Field Probes
Introduction Sometimes you may find yourself needing to make a quick check on the shielding effectiveness (SE) of a material, such as plated plastic or shield gasket material. It’s possible to set up a quick measurement setup using near field probes by using a couple H-field (for magnetic field SE) or E-field (for E-field SE). You’ll also need a spectrum analyzer with … [Read more...]
Troubleshooting Radiated Emissions at the EMC Test Lab
Note: This is an excerpt from the book, EMI Troubleshooting Cookbook for Product Designers, by Patrick André and Kenneth Wyatt. See Reference 1. Introduction Radiated emissions are by far your highest risk when performing compliance testing at the test facility. With all the high-speed digital circuitry inside electronic products today, it becomes all too easy for harmonics … [Read more...]
5 Ways Signal Noise Can Impact Electrical Equipment
Accurate data acquisition is often critical in various engineering and technical projects. However, a pervasive yet often-overlooked issue that arises in the system is signal noise. This unwanted electrical interference, originating from multiple sources, can corrupt measurements, hinder communication, and compromise equipment integrity. Recognizing the Symptoms: … [Read more...]
EMC and EMI Simulation for Launchers and Satellites
By: Yannis Braux and Stephen Murray CST Computer Simulation Technology Introduction EMC and EMI analysis plays an important role in ensuring the correct functioning of electronic systems and guaranteeing reliability throughout their lifetimes. This task is all the more difficult and crucial when the system is complex or exists in a challenging EM environment. This … [Read more...]
Wireless Network Interference and Optimization
Introduction With the proliferation of embedded wireless systems in all imaginable products, comes the risk of increasing interference and resulting slowdown in data transfer. As we transition to a more mobile and connected society, the number of Wi-Fi (home appliances and control) and Bluetooth-enabled devices (speakers, headset, watches, etc.) is rapidly increasing. Add … [Read more...]
How to Choose Particle-Filled Silicones to Meet Multiple Design Requirements
Many electronic designs need shielding materials that combine resistance to electromagnetic interference (EMI) with other application-specific requirements. For example, the EMI gaskets that are used in military touchscreens need to attenuate EMI emissions, provide electrical conductivity, and ensure environmental sealing. These shielding gaskets also must also cushion the unit … [Read more...]
Does Your Automotive Printed Circuit Board Have Too Many Grounds?
Abstract One of the most widespread design defects in automotive printed circuit boards is the lack of an established high-frequency reference ground. This problem is exacerbated by a tendency among automotive design engineers to cut up solid current return planes in an attempt to establish “noisy” and “quiet” grounds. Introduction Too often, the designers of automotive … [Read more...]
The Future of Shielding
THE FUTURE OF SHIELDING The future is not all that far off. With more electronic devices that are getting smaller, more portable and with continuing faster speeds, EMI or RF issues will continue to increase. There will be more integrated system-onchips (SoCs) where several functions will all be in one device that will need to be electromagnetically isolated. As an example, a … [Read more...]
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