Dow-Key Microwave

Quality Innovation in RF Switch Design and Manufacture


Founded in 1945, Dow-Key is the oldest continuously operating RF switch manufacturer in the United States. We employ our decades of experience to deliver the world’s most innovative switching components, specializing in the design and manufacture of customized, high-performance coaxial switches, waveguide switches and high-reliability (space) switches, including T-switches and switch blocks.

As the country's oldest manufacturer of electromechanical RF switches and devices, Dow-Key remains committed to providing unparalleled customer service, competitive pricing, on-time delivery, and enduring product quality.

Quality & Warranty Terms & Conditions

Supplier Resources

Brand Profile

(805) 650-0260


4822 McGrath Street, Ventura, CA 93003

Dow-Key Microwave specializes in the design and manufacture of customized, high-performance coaxial switches, waveguide switches, high-reliability (space) switches (including T-switches and switch blocks).

Quick Facts

Established & Trusted Switch Legacy, founded in 1945

36K sq ft. fully equipped, state-of-the-art facility

Onsite ISO Class 7 clean rooms

100 Satellites Supported

Federal Aviation Administration Parts Manufacturer Approval, 14 CFR, Part 21

Complete range of in-house RF and environmental testing capabilities.

Designed for a wide-range of applications; such as space, telecommunications, ATE, aerospace, ground-based satellite communications, and broadcasting.

Multiple RF Screen Rooms

Facility, Quality, & Capabilities

Facility & Test Equipment

  • Class 5 flow bench assemblies
  • RF and environment testing capabilities, including multipaction, passive inter-modulation (PIM), vibration, thermal shock, and thermal vacuum.
  • Thermal and Humidity Chambers
  • 2 world class clean rooms

Design Software

  • AutoCAD
  • Switch Design library
  • CSD Design software
  • Quality Certifications
  • AS9100 and ISO-9001 Certified through DEKRA
  • MIL-STD 45662, ANSI Z-540 and ISO 10012
  • REACH and ROHS Compliant
  • J-STD training and certification

Quality Certifications

  • AS9100 and ISO-9001 Certified through DEKRA
  • REACH and ROHS Compliant
  • J-STD training and certification
  • Dominican Republic: ISO9001:2015 Certified through SAI Global Assurance



Coaxial Switches

Dow-Key Coaxial RF switches are employed in RF testing equipment and large RF communication systems and networks to efficiently route microwave signals or RF energy within a transmission line. Our Coaxial RF switches route RF signals over a broad bandwidth from DC to 40 GHz, and are now offered with a Low PIM option to improve passive intermodulation levels from -110dBc (standard switch) to -160dBc. 




Waveguide Switches are designed to route extremely high power signals over a narrow bandwidth at low to high frequencies, making them highly applicable to space applications. To meet this market demand, MPG's Dow-Key expanded its product line and engineering capabilities in 1993, with the acquisition of the Transco Space Qualified Products, augmenting our own industry heritage in Hi-Rel Space programs with an extended line of Waveguide Switching solutions.



High Repeatability Switches

High Repeatability Switches are designed to stand up to rigorous requirements over an extended lifecycle. Dow-Key Microwave’s Reliant line of High Repeatability Switches meets these basic requirements with a dependable and economical switching solution, backed by decades of design and manufacturing innovation.




High Power Switches

MPG Switch line of High Power RF & Microwave Switches fit applications where electromechanical switches fail to meet the size, cost and speed of project specifications. At microwave frequencies, a high power switch acts as a current-controlled resistor, allowing current to flow in a single direction. When forward biased, the switch relay behaves as a closed circuit, but when the current is reverse biased, the RF switch becomes an open circuit.


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Are you ready for a career and not just a job?

Welcome to MPG. We are proud to be able to provide a work environment that encourages safety, communication and teamwork. Each of our employees plays a major role in the success of the Organization and we continue to challenge our employees by providing training, educational assistance and positive feedback, which will allow each individual to have an opportunity for growth and continued success. We are excited for the future of MPG and look forward to meeting our prospective applicants.