Field Management Services
Mitigating Electromagnetic Interference (EMF/EMI)
in Scientific & Medical Research Facilities
and Commercial Buildings

Radio Frequency Fields



Two-way radio
Sources of Radio Frequency (RF) fields include mobile two-way radio, mobile phones, broadcasting and radar transmitters. In office areas these fields will be predominately caused by two way radio or mobile phones.


Radio transmission tower
Transient Electromagnetic Fields are produced by the switching of inductive loads such as circuit breakers or motors. Lightning will also cause this type of disturbance. A transient signal in a cable produces a radiated emission with a spectral content dependent on the amplitude, rise time and pulse width of the transient. The reception of broadband fields at the lower frequencies is mainly via cables, which are electrically long with respect to the wavelength. A cable longer than one quarter of a wavelength will be an efficient receptor. Broadband radiation from transient sources is rarely found to have significant energy at frequencies exceeding 500 MHz.


Microwave tower
Conducted interference may originate from the coupling of ambient radiated interference or may be capacitively, inductively or galvanically induced in the cable by an emitting source. At audio and lower radio frequencies, EMI is primarily caused by conduction. The impedance presented by power cables, cable screens, etc. is generally low and this type of EMI will be readily propagated. Most cables act as fairly low loss transmission lines up to at least 10 MHz, above which the attenuation increases significantly due to dielectric losses and skin effect. 30 MHz is normally considered the frequency at which EMI becomes a radiated problem rather than conducted.

SEARCH

FMS Advantage

FMS is a unique EMF/EMI solution provider, known for our consultative and collaborative approach to achieve creative, cost effective results.
  • 15 years solid experience
  • 100% on-time and on budget
  • PhD and PE level staff
  • Innovative solutions to challenging EMI problems
  • US patents in EMI shielding technology
  • 100’s of mitigation projects successfully implemented
  • Has never failed to meet a mitigation goal
The FMS Advantage is our clients’ advantage. We collaborate with clients for the best solution. We listen. As a result, we provide the lowest cost effective mitigation solution options, presented in a context which reflects our client’ decisions on options best suited to their situation and budget.

Check out project examples which benefited from the FMS Advantage

FMS Experience

Over its 15 years, FMS has successfully completed hundreds of EMI projects which included a diverse range of consulting and mitigation services. Take a look at our list of satisfied clients and what they have to say.
[ Back to Top ] [ Home Page ]

Contact Us
 (323) 937-1562 LA / (212) 628-6860 NYC
Would you like to speak to someone about an EMF or EMI problem?
Name:Company:
Phone:Email:
Description of problem:

  Field Management Services
123 N. Laurel
Los Angeles, CA 90048
Phone: (323) 937-1562     Fax: (323) 934-2101
sales@fms-corp.com 		       Field Management Services
304 E. 65th Street   Suite 39 A/B
New York, NY 10065
Phone: (212) 628-6860     Fax: (212) 628-6862
sales@fms-corp.com 		       Field Management Services
Raystown, Ratoath Road,
Ashbourne, Co Meath, Ireland
Phone: +353 1 8256722     Fax: +353 1 8256733
sales@fms-corp.com