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Interference Technology

For EMI / EMC Engineers

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High Attenuation EMI/RFI Filters Meet the Requirements of MIL-F-15733

 

New dual and triple circuit power line electronic filters from Fil-Coil meet the requirements of MIL-F-15733. These dual and triple units run at operating temperatures or -550 degree C to +850 degrees C. Voltage ratings are 115 VAC, 400 VDC, 0 – 400 Hz. With minimum insertion loss characteristics, these MIL-F-15733/75 filters eliminate noise and interference to achieve … [Read more...]

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...]

E-Field Antenna Provides Strong Fields for Radiated Susceptibility Testing

 

The EFG-3 E-field generating antenna from Instruments for Industry (IFI) generates strong electric field intensities for use in radiated susceptibility test systems. A conventional 50-ohm termination of appropriate handling capability allows for the dissipation of any unused power. Consequently, the EFG-3 can handle up to 1000 watts of continuous power. The efficient … [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...]

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...]

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...]

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