IMC Acquisition

IMC Joins Knowles Precision Devices

Knowles is pleased to announce the acquisition of Integrated Microwave Corporation. With this acquisition, the Knowles Precision Devices Microwave group can offer a complete range of RF and Microwave filtering solutions supporting VHF to Ka band. In addition to the small, temperature-stable filters you have come to know from us, we can now deliver ceramic and cavity filters for lower frequency and/or higher power applications.

Founded in 1982, Integrated Microwave is a worldwide leader in the design and manufacture of custom precision RF microwave filters and multiplexers for the aerospace, defense and communications industries. Additionally, IMC is a proud supplier to NASA and has participated in every Mars mission since 2000.

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.