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...]
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
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...]
Navy Plans to Buy EMI Shielded Cabinets
The Naval Surface Warfare Center, Panama City Division intends to purchase a number of EMI shielded, shock qualified equipment cabinets with two independent 235 CFM cooling fans, mounted in the top rear of the cabinet with the intake in the bottom. The cabinets will require EMI air filters on the intake and outflow. The cabinets must be certified to MIL-STD-461E, shipboard … [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...]
Navy Plans to Buy EMI Shielded Cabinets
The Naval Surface Warfare Center, Panama City Division intends to purchase a number of EMI shielded, shock qualified equipment cabinets with two independent 235 CFM cooling fans, mounted in the top rear of the cabinet with the intake in the bottom. The cabinets will require EMI air filters on the intake and outflow. The cabinets must be certified to MIL-STD-461E, shipboard … [Read more...]
Managing & Planning the EMC of MOTS and COTS Used Within MOD Systems & Platforms
Defense contractors intending to supply military off-the-shelf (MOTS) and/or commercial off-the-shelf (COTS) electrical/electronic equipment for use on UK military platforms, or to integrate them into UK military systems now have new guidance on a risk assessment process for achieving electromagnetic compatibility (EMC). Pete Dorey, senior EMC consultant at TUV Product Services … [Read more...]
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