EMI/RFI SHIELDING  
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  What is EMI ?
  EMI (electromagnetic interference) is the disruption of operation of an electronic device when it is in the vicinity of an electromagnetic field (EM field) in the radio frequency (RF) spectrum that is caused by another electronic device.
   
  The internal circuits of personal computers generate EM fields in the RF range. Also, cathode ray tube (CRT) displays generate EM energy over a wide band of frequencies. These emissions can interfere with the performance of sensitive wireless receivers nearby. If you have a wireless receiver of any kind and use it at the same time as you operate your personal computer, you will probably hear RF noise in the receiver that originates in the PC system.
   
 

electromagnetic interference (EMI)

The internal circuits of personal computers generate EM fields in the RF range. Also, cathode ray tube (CRT) displays generate EM energy over a wide band of frequencies. These emissions can interfere with the performance of sensitive wireless receivers nearby. If you have a wireless receiver of any kind and use it at the same time as you operate your personal computer, you will probably hear RF noise in the receiver that originates in the PC system.

Moderate- or high-powered wireless transmitters can produce EM fields strong enough to upset the operation of electronic equipment nearby. If you live near a broadcast station or in the downtown area of a large city, you have probably experienced EMI from radio or television transmitters. Cordless telephones, home entertainment systems, computers, and certain medical devices can fail to work properly in the presence of strong RF fields.

   
  Health Risks and Hazards Attributed to Low Energy Radiation
   
  Bioinitiative.org/table-of-contents
  The evidence here clearly and convincingly establishes the potential for health effects of exposure to electromagnetic fields (EMF). Based on the evidence provided in this Opinion, the Committee is obligated to draw to the attention of the Commission that EMF is a new and emerging problem which may pose an actual or potential threat.
   
  Bioinitiative-2012
  Electromagnetic Field Exposure Effects (ELF-EMF and RFI) on Fertility and Reproduction
   
  EMI Electromagnetic Iinterference
  Broadband interference typically results from incidental radio frequency emitters such as electrical transmission lines, electric motors, welders, thermostats and even insectzappers. Applications where electrical power is cycled on and off rapidly is a potential source.
   
  United States Frequency Allocation-Radio Spectrum-PDF
   
   
  Electromagnetic fields and public health: radars and human health
   
  Health Risks from Exposure to Low Levels of Ionizing Radiation
   
  Medical Devices and EMI: The FDA Perspective
  An electric powered wheelchair suddenly veers off course; an apnea monitor fails to alarm; a ventilator suddenly changes its breath rate.[1,2,3] These are just a few examples of the problems that might occur when radiated electromagnetic (EM) energy interacts with the sensitive electronics incorporated into many medical devices.
   
  Microwave Emissions from Transmitters and Facilities
  Frequently asked questions about the safety of radiofrequency (RF) and microwave emissions from transmitters and facilities regulated by the FCC
   
  Mitigating EMI/RFI in Imaging and Nanotechnology
   
  Navy Medical Research
 
Biogphic  of Reported Biological Phenomena (Effects) and Clinical Manifestations Attributed To Microwave and Radio-Frequency Radiation
   
  NASA Design Guide for Shielding Effectiveness
  Design Guidelines for Shielding Effectiveness, Current Carrying Capability, and the Enhancement of Conductivity of Composite Materials.
  Published by National Aeronautics and Space Administration Marshall Space Flight Center  MSFC, Alabama 35812
   
  Non-Ionizing Radiation
  Occupational Safety & Health Administration Report on Low Energy Radiation
   
  Radiation and Life - World Nuclear Association
  An overview of radiation, radioactive decay, the health effects of radiation and ... long-wave infra-red to short-wavelength ultraviolet, which creates the hazard.
   
  Radio Frequency Safety
  FCC Policy on Human Exposure to Radio frequency Electromagnetic Fields
   
  RFI/EMI Screen Room Shielding
  External radio signals (electromagnetic radiation) through an antenna within a cage can be greatly attenuated or even completely blocked by the cage itself.
   
   
  State of the Science Regarding Health Effects of EMF
 
Prevention and Mitigation of Environmental, Health and Safety Impacts of
Electromagnetic Fields and Radiation by The U.S. Department of Transportation
 
   
  RFI and Microwave Emissions
  Frequently asked questions about the safety of radiofrequency (RF) and microwave emissions from transmitters and facilities regulated by the FCC
   
  United States Frequency Allocation-Radio Spectrum-PDF
   
   
  Wireless EMI in Healthcare Facilities
  Electromagnetic interference (EMI) between wireless electronic transmitting devices and medical equipment is a small but growing problem in the healthcare industry that should not be ignored by healthcare organizations (HCOs). Although studies and anecdotal evidence show that the critical functions of most modern medical devices are immune to wireless RF emissions, the potential for EMI does exist.
   
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Last modified: November 17, 2016