K&L Microwave®

Microwave Filters Optimized for Industry Performance


Quality and Innovation with Custom Results

Since 1971, we’ve aggressively invested in innovation to deliver interference mitigation products built to even the most exacting specifications. By taking control of the internal design and production processes, K&L Microwave can work collaboratively with customers, employing our high-quality standards and industry expertise to develop custom solutions across a full line of applications.

Our line of filters, duplexer, and subassemblies includes multiple topologies, including Ceramic, Lumped Element, Cavity, Waveguide, and Tunable Filters.

Brand Profile


2250 Northwood Drive, Salisbury, MD 21801


K&L Microwave is recognized by top-tier defense contractors and wireless infrastructure providers as a world leader in the design and manufacture of RF and microwave filters, duplexers, and integrated assemblies.

Quick Facts

K&L designs and manufactures a full line of RF and microwave filters, duplexers, and subassemblies, including ceramic, lumped element, cavity, waveguide, and tunable filters. K&L supplies many of today's most significant military and homeland security defense electronics programs.  

50+ years of Experience on Call

Pioneer in Vertical Integration

Commercial and Military Applications

182,000 Square Feet of Manufacturing Space

AS9100D with ISO9001:2015 Certified through Intertek Testing Services
J-STD-001 & IPC-A-610 trained employees

Domestic and International Programs

Facility, Qualities, & Capabilities

K&L Microwave | Salisbury, Maryland & Dominican Republic

As one of the first RF and microwave filter manufacturers to incorporate a vertical integration strategy into our design and manufacturing processes, K&L Microwave continues to push standards of innovation in interference mitigation devices. We pair our quality engineering practices with the highest levels of product manufacture and testing to ensure unmatched reliability.

Facility and Test Equipment

  • World Class humidity and temperature-controlled environment
  • State of the Art plating facility
  • In-house CNC machining center with CAD/CAM computing stations
  • Thermal and Humidity Chambers
  • Vibration and leak testing Equipment

Design Software

  • CST Software for synthesis, realization and analysis for improved first pass yield
  • Design Library
  • Filter Wizard® a web application helped customer select part
  • Cosmos FEA (validation and failure mode simulation)

Quality Certifications

  • Salisbury, MD: AS9100D with ISO9001:2015 Certified through Intertek Testing Services
  • Dominican Republic: ISO9001:2015 Certified through SAI Global Assurance
  • J-STD-001 and IPC-A-610 trained personnel



Band Pass

Band Pass Filters allow signals within a certain frequency range to pass, while rejecting or attenuating frequencies that fall outside that range. To meet customer specifications, timeframes, and cost requirements, K&L Microwave offers a full line of Band Pass Filters, that can be customized to meet varying frequencies, bandwidths and Q requirements.



Band Reject

Band Reject Filters pass most frequencies unaltered but attenuate those in a specific range to very low levels. Typically, the width of the band reject is 1 to 2 decades. However, in the audio band, a notch filter has high and low frequencies that may be only semitones apart. All Band Reject Filters or Band Stop Filters made by K&L Microwave are available as a wideband or narrowband components and can be customized to user specifications.



Low Pass

A filter that passes signals with a frequency lower than a selected cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency. The exact frequency response of the filter depends on the filter design. The filter is sometimes called a high-cut filter, or treble-cut filter in audio applications. A low-pass filter is the complement of a high-pass filter.



High Pass

A High Pass electronic filter allows signals above a certain cutoff frequency to pass and attenuates signals with frequencies that fall below the cutoff. High Pass Filters can be used for multiple applications, such as blocking DC from circuitry sensitive to non-zero average voltages or radio frequency devices. MPG can customize a wide range of RF High Pass Filter topologies to meet multiple applications across industries.


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




MPG is a trusted equipment provider serving an assortment of important aerospace applications, including aircraft anti-collision systems and air traffic control communication equipment. Products are designed to specific customer requirements to maximize overall system performance.




With its strong history servicing the Defense industry, MPG excels at delivering solutions that enable communication, provide signal control and take command of defense technology development. MPG protects mission critical Electronic Warfare applications and enables next generation Radars.




As the world’s largest manufacturer of RF electromechanical switches, MPG has supported the ATE market with superior solutions since 1999. Our experienced engineers continue to work directly with our customers to solve for some of the industry’s most complex testing equipment scenarios.




MPG is the premier provider of solutions for communications challenges arising from RF interference.  Our products enable military platforms to simultaneously operate multiple radios on the same platform without degradation in performance, range or compromises in CON-OPS. 




With its 75+ Years of Space Heritage, MPG has provided Filters, Coaxial and Waveguide Switches, and also IMUX & Assemblies to the space market. Our portfolio includes over 200 product designs and are NASA and ESA approved. MPG is an active supporter of numerous space programs.




MPG has provided interference mitigation devices in support of airborne GPS and missile GPS systems since technology inception. MPG offers a suite of GPS filters and amplifiers that fits your high reliability GPS receiver. Our ruggedized designs support ground, airborne, missile or launch/reentry vehicle.


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.