EMI Filter Company

Manufacturer of Bulkhead Mounted EMI/RFI Low-Pass Filters

for the Microwave and RF Industry.

Capacitive Low Pass Filters, Non-Capacitive Feed-Throughs, and Ground Points Available.

ISO 9001:2015 Registered


Welcome to EMI Filter Company, a division of Nordquist Dielectrics.

We manufacture bulkhead mounted low pass filters in threaded, solder-in, and press-in styles to the microwave communications industry. 

Our patented process allows us to provide the best lead times in the industry.

All EMI filters are made in the U.S.A.


Find Your Filter with one of the following options:

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View current, ready to ship filters.


Use our Product Finder to search our products and request a quote.

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Need a custom filter? We deliver on time and on budget.


Patented Process.

Since 1972.

Assembly Machines.jpeg