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Items filtered by date: August 2019

According to a survey conducted by Irdeto Global Connected Industries, 80 percent of organizations’ IoT devices have experienced a cyberattack within the last 12 months.

Published in MultiPoint Blog

In response to Executive Order 13859, on August 9th, 2019, the National Institute of Standards and Technology (NIST) released U.S. Leadership in AI: A Plan for Federal Engagement in Developing Technical Standards and Related Tools.

Published in MultiPoint Blog

On August 6, 2019, Canada’s Department of Innovation, Science, and Economic Development (ISED) released a draft of the Supplementary Procedure for Assessing Radio Frequency Exposure Compliance of Portable Devices Operating in the 60 GHz Frequency Band (57 GHz - 71 GHz). SPR-003 delineates general test methods to assess compliance with power-density exposure limits described in RSS-102 for portable devices operating in the 60 GHz frequency band.

Published in MultiPoint Blog

The latest generation of cellular technology, 5G, promises greater speed, reduced latency, larger bandwidth, higher resolution, and a capacity 1,000 times greater than that of 4G. Despite these advantages, however, 5G has had various hiccups along the way to rollout due to rumors that this generation of cellular technology will cause adverse health effects.

 

 

Published in MultiPoint Blog

Electromagnetic interference (EMI) is a disturbance that causes the malfunction of electronic equipment。 While some EMI does not pose a significant threat—such as static noise on the radio—EMI that affects critical infrastructure, military assets, and medical equipment can pose economic and, sometimes, life-threatening risks。

For instance, in 1989, EMI triggered by a geomagnetic storm disturbed the Hydro-Quebec power system. Within 92 seconds, the entire system collapsed, leaving six million people without power. This type of disaster can be extremely dangerous, as witnessed on July 13th, 2019 when New York City suffered a blackout, leaving 73,000 people without power in this summer’s intense heat. While there were no injuries or deaths reported, many were left without air conditioning, others stuck in elevators and traffic jams.

To prevent disasters like this, it is imperative to mitigate the susceptibility of electronic equipment to EMI. In order to accomplish such a task, engineers should be aware of the three types of EMI sources: inherent, natural, and man-made sources.

Inherent EMI

Inherent sources of EMI are those caused by the thermal agitation of electrons flowing through circuit resistance. Thus, with this type of EMI, a device disrupts its own functioning. Radio static is on example of inherent EMI.

Natural EMI

Natural sources of EMI are those caused by natural events, such as lightning, solar magnetic storms, rain particles, and solar radiation. These sources of EMI do not pose a serious threat to electrical or electronic equipment, but they can affect older radio frequency communication equipment. According to NOAA, however, solar geomagnetic storms, like the one described above, can cause such issues as:

  • Placing extra drag on satellites in low-earth orbit
  • Modifying the path of radio signals
  • Creating errors in positioning information provided by GPS
  • Disrupting GNSS and
  • Producing geomagnetic induced currents (GICs) in power grids and pipelines.

Man-Made EMI

Man-made sources of EMI are those produced by electrical or electronic equipment, such as powerlines, welders, generators, and computer circuits。 Often, man-made EMI occurs when two signals are within close proximity to each other, and when not properly shielded, cause malfunction or disruption。

A sub-category of man-made EMI is intentional EMI (IEMI), which is often referred to as electronic warfare. Military assets and critical infrastructure are primary targets for such attacks and can face such threats as high-altitude nuclear electromagnetic pulse, E-bombs, EMP cannons, and high-power microwave weapons.

Thus, it is imperative that such assets are properly shielded from EMI using conductive materials, which block electromagnetic emissions and reflect/absorb them. EMI shielding can be accomplished with EMI shielding gaskets and conductive silicones.

EMI Shielding

斗地主达人Shielding gaskets are mechanical devices used to protect electronics from EMI. Traditionally, they were formed from metal sheets of aluminum, copper, or steel. These sheets, however, were not malleable, and under sealing pressure, would deform and allow leakage to and from other electronic devices.

Today, shielding gaskets are formed from flexible metal screens, metal wires, metal foams, and coatings made of metallic ink. Some equipment, however, requires additional shielding benefits for such conditions as hot or cold weather—and for these purposes, conductive silicones are more appropriate.

Conductive silicones, or particle-filled silicones, are produced using silver, silver-aluminum, silver-copper, silver-glass, and nickel-graphite. Engineers might choose conductive silicones over traditional shielding gaskets because silicones resist sunlight, water, and a wide range of temperatures.

For instance, ruggedized touchscreens use conductive silicones to ensure environmental sealing in extreme weather conditions as well as to provide electrical conductivity。 Additionally, unlike some traditional EMI shielding gaskets, conductive silicones won’t stretch or become deformed during gasket cutting。

When deciding which type of metal or material to use for EMI shielding, consider the following:

  • Do you need protection against electric fields, magnetic fields, or both?
  • What is the device’s frequency range?
  • How difficult will the coating process be?
  • What are the shielding standards?
  • In what environment will the device be used?
  • How much corrosion resistance will be needed?
  • What is the cost for the materials?

EMI shielding is imperative for protecting equipment from interference, ensuring products work accordingly, and keeping users safe. To confirm that electrical or electronic equipment is compliant with FCC standards, it is important to test your products with an EMC testing lab, such as Rhein Tech Laboratories, Inc. We provide design and testing services with an emphasis on EMC/EMI, including Shielding Effectiveness Testing. To learn more about our process, check out our How We Do It page.

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