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...]
AR AS40000 Radiated Immunity Test System (800 MHz – 40 GHz)
Click Here to view "George Barth Presents the AS40000 Radiated Immunity Test System (800 MHz - 40 GHz)". … [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...]
An AR Demonstration of Expandable Power
Click Here to view "A Demonstration of Expandable Power Presented by Jason Smith ". To view other AR videos, visit the AR Information Resource Center on their website. … [Read more...]
A Second Look at the FCC Dynamic Frequency Selection Certification Issues
Both manufacturers and test labs must decide on the proper test procedures for DFS products. Since July 20, 2006, systems operating under FCC Part 15.407, specifically in the 5250- to 5350-MHz and the 5470- to 5725-MHz bands, are required to support Dynamic Frequency Selection (DFS) before the products can be certified. As part of the approval process, the FCC must carry out a … [Read more...]
FCC Releases Test Results on Possible Interference in the 2155- to 2180-MHz Band
The Federal Communications Commission (FCC) has released a study completed last month by its Office of Engineering and Technology. One of the ongoing goals of FCC policy has been to expand broadband access to more citizens—especially in impoverished or rural areas. Any auction of this particular band would be conducted with the proviso that the winning bidder would be obligated … [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...]
RFI Shielding for Volume Manufacture
PCB enclosure design, manufacture and assembly need to be considered early in equipment design to avoid costly modifications and delays in bringing the product to market. Alan Warner Tecan Components Ltd. Weymouth, UK With the proliferation of electronics, especially wireless and radio applications, in all areas of everyday life, the need for reducing radiated interference … [Read more...]
- « Previous Page
- 1
- …
- 60
- 61
- 62
- 63
- 64
- …
- 70
- Next Page »