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...]
Shielding
- High Precision 3D-Laser Cutting Technology for RF Shield Modifications - Presented by Masach
- NextGen RF Shields 5G-Enabled, Online Catalog - Presented by Masach
- RF Shielding Tames RFI and EMI Emissions - Presented by Masach
- Making Repairs Possible with Two-Piece RF Shields - Presented by Masach
- Adding Mouse Holes To Standard RF Shield - Presented by Masach
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...]
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...]
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...]
Utilizing Overlooked Characteristics of Ferrites for Improved Printed Circuit Board EMI Suppression
ABSTRACT While nickel-zinc composition soft ferrites are routinely used for PCB EMI suppression, the consequences of DC and low frequency AC bias on a device's high frequency impedance has not been widely discussed in the EMC and magnetic component literature. Virtually all EMI suppression applications in DC and AC power filter circuits place two-terminal ferrites under … [Read more...]
Laird Technologies and Employees Contribute to Chinese Earthquake Relief
Laird Technologies, a unit of Laird PLC, well known for its EMI/RFI shielding and other high tech products, has announced a corporate donation of $100, 000 for relief efforts in the earthquake devastated Chengdu Province of China. Also, individual Laird employees in China have donated a total of over 35,000 in a grass roots effort to assist their fellow countrymen. Marty Rapp, … [Read more...]
British Agency to Study the Health Effects of EM Energy from MRIs
The Chairman of Great Britain’s Health Protection Agency, Sir William Stewart has announced that the Agency’s Board has approved in principle the need for an epidemiological study of possible adverse health effects from high static Magnetic Resonance Imaging (MRI) machines. He noted, “The exposures to patients and to medical staff from the magnetic fields can be high, and there … [Read more...]
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