About Knowles Precision Devices

Knowles Precision Devices, leading global innovator of high-performance solutions.

As a division of Knowles Corporation, Knowles Precision Devices (KPD), focuses on production of a wide variety of highly engineered Capacitors and Microwave to Millimeter Wave components for use in critical applications in military, medical, electric vehicle, and 5G market segments. Radar, pacemakers, MRI equipment, satellites, airplanes, electric vehicles and mobile phone base stations are just a few of the places you will find our products. Our products can be found in every corner of the world, from 8000ft below the earth’s surface to orbiting 254 miles above us on the ISS.

We are a Specialty Components manufacturer, which means we choose to take on the complex challenges that come with High Reliability, High Temperature, High Performance and High Frequency solutions. This is built on our commitment to innovation, whether it be our ongoing creativity in manufacturing high performance multi-layer ceramic capacitors, or our unique ceramic formulations that allow us to provide the highest performance-for-footprint mmWave filters available

A Short History of Knowles Precision Devices

  • In 1985 Dielectric Laboratories, DLI (High-Q Multi-Layer Capacitors and Single-Layer Capacitors, Resonators, Filters, Broadband DC blocks, Thin Film components) became part of Dover Corporation. DLI had previously invented the Single Layer Capacitor in 1974.
  • Shortly after in 1987 Novacap (specialized MLCC products to serve unique and difficult high reliability, military and space requirements) joined the family
  • In the year 2000 Syfer (MLCC products to serve demanding commercial and industrial requirements) came on board, having just invented Flexicap, an approach to avoiding MLCC cracking that the entire capacitor industry has since adopted. At the same time we created the Cap-Rack approach to increasing capacitance in a reduced footprint
  • Voltronics (world leader in precision variable capacitors) was brought in in 2004 to expand our multi turn trimmer capabilities.
  • Further development of high CV capacitors followed with the creation of StackiCap technology in 2012
  • In 2014 Knowles Corporation was established as a publicly traded company. DLI, Novacap Syfer and Voltronics formed the new Precision Devices division.
  • Johanson Manufacturing, a world-class supplier of trimmer capacitors, non-magnetic variable inductors and microwave tuning elements, joined our company in 2017
  • To complement our existing strengths in Single Layer Capacitors, Compex was acquired in 2018.
  • IMC joined Knowles Precision Devices in 2021 to further bolster our RF and microwave solutions portfolio.