EMI Filter Company

EMI Filter Company, a division of Nordquist Dielectrics, manufactures bulkhead mounted low pass filters in threaded, solder-in, and press-in styles to the microwave communications industry. EMI Filter Company brought automation and lean manufacturing to filter manufacturing while others in the industry simply moved offshore. All EMI filters are made in the U.S.A. Our patented process allows us to match stocked capacitors with stocked filter body assemblies to provide the best lead times in the industry. Our parent company, Nordquist Dielectrics, was founded in 1972 by Larry and Pat Nordquist for manufacturing and selling ceramic multilayer discoidal capacitors to filter manufacturers. Putting their life savings at risk, Larry and Pat started manufacturing in the back of their house. Three years after incorporating, they received their first order. Larry built most of the equipment himself with minimal machine shop assistance, fabricating them from an assortment of powders all the way to the finished product. The feat was no average backyard project and required milling, dry tape casting, lamination, bakeout, firing, termination and testing. Jelly jars, pieces of old windows, and even coffee cans were repurposed for the effort. From these humble origins, they grew the company to where it stands today as a family owned business that has proudly served filter manufacturers for over 40 years.