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Interference Technology

For EMI / EMC Engineers

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University of St. Andrews Researchers Use Ferrites to Create Faraday Rotators

 

An important component in many microwave and mm-wave systems is the isolator or circulator. University of St. Andrews researchers use permanently magnetized ferrite materials to construct quasi optical Faraday rotators (QOFRs) which can be used to make both isolators and circulators. These devices have very high performance and are a key enabling technology for many mm-wave … [Read more...]

MILMEGA Now Offers North American Service Capability

 

UK-based amplifier manufacturer MILMEGA has added local national service capability within North America to its growing global network of Service Centers. Servicing of MILMEGA products sold into the USA and Canada will take place at the Rohde & Schwartz Service and Calibration Center in Columbia, Maryland. Find more details at the MILMEGAwebsite. … [Read more...]

AT&T Signs Five-Year Telecom Contract with Shell

 

AT&T Inc. has announced that it has won a $1.6 billion contract to provide Royal Dutch Shell Plc., the Netherlands-based oil and gas giant, with advanced telecommunications services. The five-year agreement will see AT&T providing, managing, and maintaining Shell’s worldwide communications infrastructure, while looking after its global mobility needs.AT&T says that … [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...]

Focus on EMC Detroit 2008: A New Channel Launches

 

The annual IEEE EMC Symposium on Electromagnetic Compatibility is a yearly high point for EMI/EMC professional around the world. Symposium attendees decide among the many technical and social opportunities, strive to make the most of each day, and arrive home with a wealth of information to share. Others who could not attend this year are still anxious to hear about the latest … [Read more...]

Connectors Conundrum

 

Shielded connectors and the effective use of connectors can be vital to achieving EMC. An impressive variety of shielded connectors, shielded cables, and shielded conduits can be found in the Interference TechnologyBuyers Guide. And any questions about design, connector choice, or effective use can be posted to the new Connectors Forum, a venue that lets you swap ideas with the … [Read more...]

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