EMI suppressant tubing from CAPCON, Inc. provides a simple, low cost efficient means for suppressing unwanted EMI. This product can be slipped over standard wires and cables (insulated or uninsulated) and suppresses both conducted and radiated interference. Completely flexible and lightweight, this tubing can be used in temperatures from -55 degrees to +250 degrees C without … [Read more...]
Shielding
Conductive Materials Available in a Wide Variety of Formulations
E-Fill™ from Sulzer Metco is an aluminum compatible nickel graphite conductive filler that offers advanced corrosion resistance and stability in harsh environments. It is especially well suited to applications involving coated flanges. The angular shape of E-Fill™ coupled with a proprietary hard nickel coating gives gaskets the necessary “bite” needed to ensure optimal … [Read more...]
Nickel Acrylic Coatings Provide Cost Effective EMI Shielding
Nickel acrylic paints in the ECP 500 Series are now available from TBA Electro Conductive Products (ECP). Surface coatings offer the simplest and most cost effective solution for EMI problems in a wide range of applications. They can be applied with minimal training and equipment requirements using conventional paint spray techniques. ECP 502/552 nickel acrylic coatings deliver … [Read more...]
Conductive Tabs Provide Low Impedance
Conductive grounding from Chomerics provide EMI protection by establishing low impedance ground paths between electrically conductive elements in a chassis or component. These stabs forestall interference from the surface currents that “excite” metal components and thus create “phantom” fields. The tabs can be used to provide the required grounding paths economically as … [Read more...]
EMI Shielding and Optical Enhancement to Touch Screens
Electromagnetic attenuation features can be incorporated as an integral part of touch screens rather than as a separate component in those display applications requiring shielding for EMI/EMC compliance. Various enhancement techniques and design considerations will be reviewed. Features and methods employed will vary with particular touch screen enhancements and will include … [Read more...]
PCB Board Level Enclosures: A Vital Design Element
PCB design is vital to the efficacy of innumerable electronic products. A reliable product and marketplace success are the ultimate rewards for careful consideration of all design issues. Choosing an appropriate board level enclosure is just one element of successful design efforts, and the choice must be carefully considered along with other crucial issues including the … [Read more...]
Crucial RF Shielding Selection Considerations
Gary Fenical Laird Technologies INTRODUCTION Designers must attenuate RF signals for various reasons. Since a product cannot be legally marketed unless it meets EMC requirements, designers must curtail RF signals above a certain limit. It is important to consider RF shielding materials at the beginning of a design project because choosing the correct kind of shielding upfront … [Read more...]
Understanding Shielding Effectiveness of Materials and Measurements in the Near-Field and Far-Field
When we treat the shielding effectiveness measurement with a uniform field, the results are similar for both near and far fields. Kermit O. Phipps and Philip F. Keebler EPRI EMC Laboratory, Knoxville, TN, USA INTRODUCTION Traditionally Schelkunoff’s shielding effectiveness equation is used universally in teaching and practice throughout the EMC community as a whole. In this … [Read more...]
Magnetic Shielding Design for Manufacturing
Sensitive electronic devices require protection from radiating magnetic fields. David Grilli Magnetic Shield Corporation, Bensenville, IL, USA Magnetic shielding for static and low frequency (<100 kHz), time-varying magnetic fields is accomplished by containing a specific device or item within a sheet metal enclosure of high permeability material. Typically, a sensitive … [Read more...]
Designing an RF Shielded Enclosure
Ron Brewer EMC/ESD Consultant Shielding has been with us a long long time. Early AM radios had shielded RF and IF transformers, shielded electron tubes, and compartmentalized shielded chassis. These shields were necessary to prevent RF pickup, feedback, and oscillation by the electron tubes, radiation from the local oscillator, RF contamination of the IF strip, and crosstalk … [Read more...]
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