Connecting & Protecting People®

MPG is the most trusted supplier of spectral purification, interference mitigation, and spectrum monitoring solutions used in RF & Microwave applications.


Microwave Products Group is Connecting & Protecting People® by uniting industry leading Filters & Switch brands that design and manufacture communication-based specialty products. These filter and switch products when combined with our extensive and innovative engineering processes and customization capabilities bring our customers to MPG Solutions®, our powerhouse partner with Spectrum Operations for the most challenging RF problems.

Filters | Top-tier global leaders in filtering technologies

Our Filters Line specializes in developing advanced tunable and fixed filters to improve RF communications and signal processing. Dedicated to innovation, quality and customer satisfaction, our reliability and SWaP compatibility is unmatched. BSC Filters, K&L Microwave, and Pole/Zero are all critical pillars contributing to the success rate of our customers most critical missions.

Switches | There is no substitute for experienceSM

Dow-Key Microwave has been one of the world's largest manufactures of electromechanical switches for RF & Microwave applications since 1945. Leveraging generations of evolving technologies our high-performing, low insertion loss switches are distinguished by quality and reliability. Because of the high-reliability and high-repeatability of our Switches, they are suitable for customers in a wide range of applications, including launch vehicles and manned vehicles and satellites in Space.

MPG Solutions® | Unique integrations for the most challenging environments

Collectively leveraging a wealth of long-standing brand recognition through MPG's original five brands, MPG Solutions® accelerates innovative and trusted Switch & Filter technologies that are engineered into advanced system solutions that meet the ever-advancing customer requirements. Our cross-functional and global resource base provides over 200+ years of niched experience in RF design and manufacturing which is coupled with transformative business support to deliver the most reliable communications solutions our customers can depend on.

Spectrum Operations | Advanced RF signal solutions

MPG’s Spectrum Operations Line features our Espy brand of wideband RF signals search, survey, discovery and geolocation solutions. Our AI/ML technologies cater to optimize overall system and software performance and are very well-suited for a variety of spectrum monitoring and enforcement applications that our critical to global defense and security.

MPG Heritage

Better Together

K&L Microwave was acquired by Dover Corporation in 1983 and was the founding filter brand within MPG and paved the way for our high committment to quality and customer service. Switch partner Dow-Key Microwave joining in 1996. The complimentary duo was able to capture RF & Microwave customers who required more dependable and higher quality products for system critical applications and as a result, Microwave Products Group was established in November of 2005 as a part of Dover Engineered Products.

As the need for more integrated equipment and sub-systems increased with defense and military technological and threat advancements, Pole/Zero was strategically added to the fleet of industry innovators in 2007 and propelled MPG into new market opporunities with Tunable Filters & Integrated Cosite Equipment subsystems. As global market needs and requirements became such an integral part of MPG's business, a UK-based leading filter and diplexer provider, BSC Filters was a critical augmentation in 2010 and an excellent strategic fit within MPG.

Further solidifying MPG's technological leadership in RF applications, Espy Corporation was aquired by Dover and added to MPG in 2021. Espy's AI/ML capabilities add to MPG's suite of signal intelligence / spectrum operations solutions as the demand for radio frequency detection and spectrum analysis grows globally with the increased sophistication of radio communications. The evolution of acquisitions led to an extrodinary opportunity for cross-selling and co-development of our advanced market-leading products, thus MPG Solutions® was created as an integrated collaboration and blend of the industries best, most reliable brands and technologies.

Quick Facts

MPG has a long-standing foundation of providing reliable products & solutions to push the boundaries of innovation in order to deliver our commitment of Connecting & Protecting People®.

K&L Microwave in Salisbury, MD was established in 1971 and acquired by Dover Corporation in 1983

Located in Ventura, CA Dow-Key Microwave was established in 1945 and joined the Dover family in 1996

Pole/Zero was the third additon to MPG in 2007 and was established in Cincinnati, Ohio in 1991

BSC Filters located in York, United Kingdom was founded in 1989 and added as our MPG UK based division in 2010

Espy, established in 1999 in Austin, TX was acquired by Dover in 2021.

MPG Solutions® was created and launched in 2022, showcasing all of MPG's brands re-engineered into custom advanced RF & Microwave assemblies & subsystems.

Our Commitment

MPG is committed to Connecting & Protecting People® whose safety and freedom have come to depend on the reliability of RF & Microwave signals in the harshest of conditions, when it matters most. Our Products & Solutions are relied on by customers around the world and in the most critical of applications. Whether it's a soldier calling for a lifeline where communications signals do not already exist to ensuring commericial airliner safety with our products that reside in Aircraft Anti-Collision Systems. MPG’s strong heritage of innovation and commitment to advancing RF & Microwave integration and capabilities allows us to forge transformative technologies that are Connecting and Protecting People® everyday.

When we say Connecting & Protecting People® it means providing the best of our products & solutions to our Customers, Employees, Suppliers, Shareholders, and Communities. Our people are the heartbeat of our mission.

  • Our Customers have made MPG an integral part of their engineering procurement process. Between building strategic long-term partnerships and leveraging program engineering resources to providing post-support system level integration, analysis, and troubleshooting - we are here to ensure that every mission is successful.
  • Our Employees are our first and last lines of defense for our Quality, On Time Delivery, Productivity and Values. Employee-driven Continuous Improvement teams are manned at all levels of our organization and at each of our operating sites. The employees of MPG are results driven and take personal accountability for doing their job to the best of their ability - knowing lives depend on them.
  • Our Suppliers are a direct extension of MPG and a vital part of our success. We depend on our suppliers for Quality, On Time Delivery and Values alike.
  • MPG is Connecting & Protecting our Shareholders by ensuring that our business processes and practices alighn with the high values and expectations of Dover.
  • The communities in which our operating sites are located are a focal point of our Philanthropic efforts. Our sites focus on local and veteran charities wherever possible. Our efforts include humanitarian relief for disaster victims, veterans chartities, and local drives and employee related fundraisers, with an employee matching program. All of our charties fall under the guidelines of Dovers acceptable policies.


Our Values

Microwave Products Group leadership and employees take pride in being the backbone of MPG and Dover Corporation. We express and show an unwavering commitment to following the five Dover Corporation Values, which are:

  • High Ethical Standards, Openness and Trust
  • Collaborative Entrepreneurial Spirit
  • Winning Through Customers
  • Respects and Values People
  • Expectations for Results

Our MPG Executive Leadership Team, along with our site leadership commit to following Dover's Leadership Competencies. Read more at the link below.

Read More

MPG Brand History

MPG Executive Leadership Team

Ron Ruppersburg

President | MPG

Brandon Shimokawa

Chief Financial Officer | MPG

Matt Shelley

Vice President | MPG Solutions®

Zelma Diaz

Vice President, Business Development | MPG

Rod Smith

Vice President, Operations | MPG

Andrea B. Kelley

Vice President & General Manager | Espy

Gina M. Justice

Senior Director of IT | MPG


MPG is committed to increase our environmental awareness, reduce our environmental impact, protect the health and safety of our employees, support our community and continue to meet the needs of our customers.

We will fulfill this commitment through:

  • Continually improving our technology to reduce waste and prevent pollution.
  • Close monitoring, continous improvement, and reporting compliance of our environmental management system.
  • Compliance with all applicable federal, state and local environmental health and safety laws and regulations or other requirements.
  • Using our natural resources wisely.
  • Applying the policy when settings and reviewing the environmental objectives and targets.
  • Adherence to strict RoHS Compliance to ensure that potentially harmful substances do not pollute the air, landfills, or waterways.
  • RoHS Compliance

Explore Products And Solutions By:

Search & Design Tools

Product Finder

Browse products by type, class, family and operating frequency.
Go To Product Finder

Filter Wizard

Use to search or build K&L Microwave® filters.
Go To Filter Wizard

QuEST Filter Tool

Use to build custom BSC filters.
Go To QuEST Filter Tool

Manufacturing job


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.


A Dover Company

Dover is a diversified global manufacturer and solutions provider with annual revenue of approximately $8 billion. We deliver innovative equipment and components, consumable supplies, aftermarket parts, software and digital solutions, and support services through five operating segments: Engineered Products, Clean Energy & Fueling, Imaging & Identification, Pumps & Process Solutions and Climate & Sustainability Technologies. Dover combines global scale with operational agility to lead the markets we serve. Recognized for our entrepreneurial approach for over 65 years, our team of over 25,000 employees takes an ownership mindset, collaborating with customers to redefine what’s possible. Headquartered in Downers Grove, Illinois, Dover trades on the New York Stock Exchange under “DOV.” Additional information is available at