EMI/RFI Filters


EMI/RFI Filtering


EMI/RFI Filters capabilities & products

Custom and Rectangular
EMP & Voltage Transient
EMP & Voltage Transient Image

The RFI SPECIALTY COMPONENTS program includes a range of EMI/RFI filters that are designed to protect circuits against very high energy transient events. Examples include:



Mil STD 461
Mil STD 461 Image

Ultra EMS can provide EMI filters specifically designed for reducing emissions and lessen susceptibility for compliance to Mil-STD-461. The filters will comply with the restrictions on Leakage Current for both 60Hz and 400 Hz power systems but are characterized with Insertion Loss data directly related to the Mil-STD-461 testing methods.


Shielded Rooms
Shielded Rooms Image

FILTRON products were first designed and built in 1946 to address the growing demand for devices offering protection against electromagnetic interference produced by radar, computers, radio transmitters and receivers, as well as by motors, generators, and switches. Applications for these filters are found in many commercial and private test laboratories, and at the secure room installations in military and diplomatic facilities. All FILTRON products are made in America at the facilities of Ultra Electronics EMS Development Corporation. Additional Shielded/Secure room filters that have been designed and developed by EMS and the RFI Corporation are an important part of the RFI Specialty Components program. Examples include a telephone line filter that is available in multi circuit assemblies, and a power line filter which is designed to be direct-mounted through the wall of a shielded room or cabinet.

Additional information on these and other products is available in the RFI Specialty Components Programs general catalog, or by contacting the factory.


Tempest Image

The RFI Specialty Components of ULTRA EMS includes lowpass power TEMPEST filters that are deployed in defense and in private installations to prevent power lines and other outlets from acting as transmitters of electronic data. With a TEMPEST filter, sensitive information will not become conducted EMI signals leaking from PCs, servers, telephones, etc. These filters are recommended for use in shielded rooms, secure communication areas, as well as in shipboard electronic installations. Pictured is one of many possible TEMPEST filter designs.



EMI/RFI Filtering specialist capabilities