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Interference Technology

For EMI / EMC Engineers

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Antennas

Antenna-to-Antenna Coupling On An Aircraft: Mitigation Techniques

 

The number of RF systems available for use in mission specific aircraft has grown dramatically over the last few decades, with numerous systems operating across very wide bandwidths (some covering almost the entire 1MHz to 40GHz range). Compatibility issues have become almost a certainty on all but the simplest of aircraft installations, and numerous mitigation techniques have … [Read more...]

Christmas Music in the Chamber

 

How a sprinkler system brought radio noise to a chamber and the techniques used to find and remove it. Candace Suriano and John Suriano Auburn Hills, Michigan, USA Anechoic and semianechoic or ALSE (Absorber Lined Shielded Enclosure) chambers are supposed to prevent radio signals and other radiated noise in the environment from being detected inside the chamber.  A chamber … [Read more...]

The HF Current Probe: Theory and Application

 

This article describes one of the most valuable tools in the EMC engineer's “bag of tricks” – the high-frequency current probe. Current probes are invaluable for measuring high-frequency common-mode (or “antenna”) currents flowing on wires or cables. Experience has proven that poorly terminated (bonded or filtered) cables are the no. 1 cause for radiated emissions failures at a … [Read more...]

Company Collaborates with Danish Navy to Solve L Band Radar Interference Issue

 

Cobham Antenna Systems, makers of sensor and antenna systems, and in partnership with Seasat, “have successfully demonstrated its L band interference resistant Sea Tel 9797B and Sea Tel 4009M marine stabilized antenna systems” which are capable of operating in the “X band and Ku band radio frequency spectrum, respectively.” The antenna systems were purchased by the Danish … [Read more...]

Man Uses Illegal Cell Phone Jammer on SEPTA Buses

 

A Philadelphia man was caught using a cell phone jammer to stop people from using their cell phones on a SEPTA bus route. The man purchased the signal jammer off the internet to “shut down conversations he doesn’t want to hear.” According to federal law, “it is illegal to use, own, buy or sell cell phone jammers.” Local police say breaking this law “could result in jail time … [Read more...]

Radiated Immunity Test System At Kidde Safety

 

AR, makers of RF/Microwave instrumentation, installed one of their Radiated Immunity Test Systems (model AS04210M2) at Kdde Safety is Colorado. The purpose of the unit is to “test Kdde’s fire and safety products.” The model is designed to “produce fields up to 10V/m with 80% AM (18V/m CW) at a 3m test distance from 80 MHz-4.2GHz for radiated immunity testing” in an EMC … [Read more...]

Electromagnetic Waves Heard Around the World

 

People around the world have reported hearing some bizarre noises. The latest were recorded in the Battlefords, Canada last weekend. Similar experiences were reported in Saskatoon, northern Saskatchewan, and parts of the USA and Europe. University of Saskatchewan professor Jean-Pierre St. Maurice says there is a natural explanation, "Somehow they are picking up noise from an … [Read more...]

Electromagnetic Software Package for Virtual Testing

 

ESI released a new version of PAM-CEM Simulation Suite, electromagnetic package for virtual testing in the middle and high frequency ranges. This latest version includes treatment of 3D anisotropic materials and extended DMP (Distributed Memory Processing) parallel processing for improved performance. The first breakthrough of this release is the completely new version of the … [Read more...]

New Wireless Power Transmission Module

 

Murata Electronics’ new wireless power transmission module LXWS series enables wireless charging systems for tablet PCs, mobile devices, music players, and a host of other consumer electronics. The LXWS series is capable of charging at 10W, includes a high level of positioning freedom, and integrates removal and error detection to ensure optimal system operation.The … [Read more...]

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