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Interference Technology

For EMI / EMC Engineers

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Antennas

Differential Transfer Impedance of Shielded Twisted Pairs

 

Michel Mardiguian, EMC Consultant, Saint-Rémy-lès-Chevreuse, France The concept of Shield Transfer Impedance (Zt), introduced by S. Schelkunoff in 1934, is a very convenient parameter for the prediction and control of EMI coupling through cable shields. Although widely applied to coaxial cables against EMI susceptibility problems, the Zt parameter can be easily extended to … [Read more...]

1.04m Rod, Antenna Factor and Received Level in MIL-STD 462/461E Compared to MIL-STD 461F Test Set Up

 

David A. Weston, EMC Consulting, Inc., Merrickville, Ontario, Canada INTRODUCTION This paper shows that the antenna factor of the receiving rod antenna and the E field incident on it, from a standard source of radiation, both change when the counterpoise of the rod is either isolated from the ground plane on the table (new MIL-STD-461F set up), or connected, as per … [Read more...]

Nokia N8 Teardown Finds Sharp Design

 

In a teardown of Nokia’s flagship N8 smartphone, repair site iFixit deemed the placement of the phone’s EMI shield a standout feature.After removing the screws and popping off the antenna, which Nokia put near the plastic plates near the top and bottom of the largely aluminum N8, the mid-plane can be removed. “The design of the steel mid-plane is pretty genius,” iFixit wrote. … [Read more...]

Antenna Design Prevents Interference

 

Taoglas, a M2M (machine to machine) antenna provider, recently launched a heavy-duty, waterproof external M2M antenna for use in telematics, transportation and remote monitoring applications. The antenna’s design purportedly prevents noise interference from the RF module or nearby electronic equipment entering the antenna.Visit Taoglas to learn more. … [Read more...]

Antenna Design Prevents Interference

 

Taoglas, a M2M (machine to machine) antenna provider, recently launched a heavy-duty, waterproof external M2M antenna for use in telematics, transportation and remote monitoring applications. The antenna’s design purportedly prevents noise interference from the RF module or nearby electronic equipment entering the antenna.Visit Taoglas to learn more. … [Read more...]

Field Generation Test System Is Fully-Shielded To Prevent EMI Interference

 

AR RF/Microwave Instrumentation has designed a complete field generation test system that is fully shielded, making it ideal for use in an anechoic chamber without being susceptible to or causing interference.Model AS18013 houses a variety of field generation equipment in two air-conditioned EMI-shielded equipment racks. Among the included equipment is the SC1000M3 system … [Read more...]

New ETSI Standard on EMC and Radio Spectrum Matters

 

Electromagnetic compatibility and Radio spectrum Matters (ERM); Short range devices; Radio equipment to be used in the 1 GHz to 40 GHz frequency range;Part 2: Harmonized EN covering the essential requirements of article 3.2 of the R&TTE DirectiveThe present document applies to the following Short Range Device major equipment types:1) Generic Short Range Devices, including … [Read more...]

New Spectrum Analyzer with Range from 100 kHz to 7 GHz

 

Agilent Technologies has announced the addition of a new handheld spectrum analyzer to the company’s product line. The N9342C has a measurement range of from 100 kHz to 7 GHz and is designed for use in RF installation, maintenance and surveillance applications. The instrument includes a built-in GPS receiver and antenna for precise location determination and also has a power … [Read more...]

Arizona Resident Finds Solution to Garage Door EMI Problems

 

Arizona resident Len Thomas’ automatic garage door opener stopped functioning properly due to radio signals emitted from a new communications site in use by Marine Corps Air Station Yuma, Ariz. Until, that is, he found a simple solution to his problem. Find out how he solved the issue with speaker wire, a garage door antenna, and less than $5. Read more in the Yuma Sun. … [Read more...]

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