What K&L Microwave does

K&L Microwave is a Salisbury, Maryland-based designer and manufacturer of RF and microwave filters, duplexers, and integrated subassemblies operating since 1971. The company produces filters across multiple topologies — ceramic, lumped element, cavity, waveguide, and tunable — using a vertical integration strategy that spans in-house CNC machining, plating, environmental and vibration testing, and proprietary design tools including CST Software, Cosmos FEA, and a Design Library. Products include bandpass, bandreject, lowpass, and highpass filters; coaxial, waveguide, and space-qualified switches; and integrated solutions such as cancellers, frequency converters, receivers, switch matrices, switched filter banks, low noise amplifiers, RF distribution/multicouplers, and subsystems/IMAs, with additional spectrum operations offerings (teamSENTINEL, teamSOIGNE). K&L holds AS9100D with ISO9001:2015 certification, maintains J-STD-001 and IPC-A-610 trained personnel, and is a NASA and ESA approved supplier.

K&L is a brand within Microwave Products Group (MPG), a subsidiary of Dover Corporation, and operates alongside sibling brands Dow-Key Microwave, Pole/Zero, BSC, Espy, Criteria Labs, and MPG Solutions. Manufacturing is split between a 182,000-square-foot Salisbury, Maryland headquarters and a Dominican Republic facility, supporting commercial and military demand. The company sells primarily through direct enterprise sales into defense, aerospace, communications, GPS, space, and automated test equipment verticals, with quote-based pricing for custom solutions and self-service discovery via FilterWizard® and MPG Wizards web tools. End customers are top-tier defense contractors, wireless infrastructure providers, and aerospace OEMs; the company supplies significant military and homeland security defense electronics programs.

Name

K&L Microwave

Legal name

K&L Microwave

Website

https://klmicrowave.com

Company type

Private

Founded year

1971

Operating status

Operating

Headcount range

251–500 employees

Short description

K&L Microwave, founded in 1971 and based in Salisbury, Maryland, designs and manufactures RF and microwave filters, duplexers, and integrated assemblies for defense, aerospace, wireless infrastructure, space, and GPS customers. It is a brand within Dover Corporation's Microwave Products Group.

Ownership category

akta.pro rank

Product category

RF and Microwave Filters

NAICS

Other Communications Equipment Manufacturing (33429)

SIC

Electronic Coils, Transformers & Other Inductors (3677)

akta.pro primary industry

RF Filters & Duplexers (SAW/BAW/FBAR) (HDAHAMAG)

akta.pro secondary industry

Passive Filters & RF Passives (LC Filters/Diplexers/Baluns/Attenuators) (HDAHANAG)

Keywords

• RF microwave filters
• Duplexer assemblies
• Coaxial waveguide switches
• Defense electronics components
• Integrated microwave assemblies

Headquarters

HQ city

Salisbury

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. RF and Microwave Filter Products: Sale of standard and custom RF and microwave filters, duplexers, and subassemblies across multiple topologies. Products are sold as components to defense contractors, wireless infrastructure providers, and aerospace companies.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

K&L Microwave designs and manufactures RF and microwave filters, duplexers, subassemblies, and switches across multiple topologies including Ceramic, Lumped Element, Cavity, Waveguide, and Tunable Filters. The company provides both standard catalog products and custom-engineered solutions for defense, aerospace, space, and wireless infrastructure customers. It operates a vertically integrated design and manufacturing strategy, producing components that address interference mitigation, signal conditioning, and frequency filtering in mission-critical applications.

Product overview

K&L Microwave is a brand within Microwave Products Group (MPG), specializing in RF and microwave filters, switches, and integrated solutions for defense, aerospace, and communications applications. The portfolio includes multiple filter topologies (Ceramic, Lumped Element, Cavity, Waveguide, and Tunable Filters) offered as Bandpass, Bandreject, Lowpass, and Highpass variants. The switch portfolio covers Coaxial Switches (standard, high power, and high repeatability), Waveguide Switches, and Space Qualified Switches. Integrated Solutions include Cancellers, Frequency Converters, Receivers, Switch Matrices, Switched Filter Banks, RF Distribution equipment, Subsystems & IMAs, and Low Noise Amplifiers. Spectrum Operations products include teamSENTINEL, RF Peripherals, and teamSOIGNE. A web-based FilterWizard® tool assists customers with part selection. Products are manufactured in Salisbury, Maryland and Dominican Republic facilities.

Differentiator

Problem solved

Functional benefit

Products and services

• Bandpass Filters Filters that allow signals within a certain frequency range to pass while rejecting or attenuating frequencies outside that range. Can be customized for varying frequencies, bandwidths, and Q requirements for defense, aerospace, and communications customers.
• Bandreject Filters Filters that pass most frequencies unaltered but attenuate those in a specific range to very low levels. Available as wideband or narrowband components, customizable to user specifications.
• Lowpass Filters Filters that pass signals with a frequency lower than a selected cutoff frequency and attenuate signals with frequencies higher than the cutoff frequency.
• Highpass Filters Electronic filters that allow signals above a certain cutoff frequency to pass and attenuate signals below the cutoff, usable for blocking DC from circuitry or radio frequency devices.
• Multiplexers RF filtering devices that combine or separate multiple signal channels.
• Coaxial Switches Electromechanical coaxial switches for RF signal routing applications.
• High Power Coaxial Switches Coaxial switches designed for high power RF applications.
• High Repeatability Coaxial Switches Coaxial switches with high repeatability specifications for precision RF applications.
• Waveguide Switches Waveguide-based switches for RF signal routing in waveguide systems.
• Space Qualified Switches Switches qualified for space applications with enhanced reliability and radiation tolerance.
• Cancellers Interference cancellation devices for RF systems.
• Frequency Converters Devices that convert RF signal frequencies for various applications.
• Cosite Interference Mitigation Solutions Solutions for mitigating cosite interference in military and defense platforms.
• Receivers RF receivers for signal reception and processing.
• RF Distribution and Multicouplers Signal conditioning and RF distribution equipment including multicouplers.
• Subsystems and IMAs Integrated microwave assemblies and subsystems for defense and aerospace applications.
• Switch Matrices Switch matrix systems for RF signal routing in complex systems.
• Switched Filter Banks Filter banks with switching capability for frequency selection.
• Low Noise Amplifiers Amplifiers designed to minimize noise while amplifying RF signals.
• teamSENTINEL Spectrum operations solution for signal intelligence and monitoring applications.
• RF Peripherals RF peripheral equipment for spectrum operations.
• teamSOIGNE Spectrum operations solution for specialized applications.

Quantifiable outcome

• 50+ years of experience providing reliable RF filter solutions to defense and commercial markets
• +1 more outcomes

Named customers2 records

Segments6 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators4 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Johanson Technology: Manufactures ceramic and RF chip capacitors, inductors, and ceramic bandpass filters for wireless, broadband, and military applications — overlapping with K&L on ceramic filter topology and broadband RF components.
• Mini-Circuits: Designs and manufactures RF/microwave components including filters, amplifiers, mixers, and integrated subassemblies for commercial, military, and test-and-measurement markets — a broad RF component peer overlapping K&L on filters and integrated assemblies.
• CTS Corporation (CTS Electronic Components): Designs and manufactures RF filters, duplexers, and piezoelectric components for defense, aerospace, and wireless markets — directly comparable to K&L's RF/microwave filter product line.
• Knowles Precision Devices: Manufactures specialty filters, EMI/RFI components, and frequency control devices for aerospace, defense, and communications. Overlaps with K&L on RF filters and signal conditioning for military and aerospace customers.
• API Technologies (now Spectrum Control / Heico): Specializes in RF/microwave components including filters, multiplexers, and integrated assemblies for defense, aerospace, and communications — a direct peer to K&L in custom military-grade RF filtering and integrated subsystems.

Broad incumbents

• Skyworks Solutions: Major RF semiconductor company producing filters, power amplifiers, and front-end modules for mobile and wireless infrastructure — a comparator on RF filter technology serving overlapping wireless infrastructure end markets.
• TDK Corporation (EPCOS): Manufactures passive electronic components including RF filters, duplexers, and signal conditioning devices under the EPCOS brand, serving communications and industrial markets. Comparable to K&L in filter manufacturing depth and wireless infrastructure focus.
• Qorvo: Specializes in RF system solutions including BAW/SAW filters and front-end modules for mobile, defense, and Wi-Fi infrastructure. Qorvo is a direct comparator for RF filtering and duplexing technology serving defense and wireless infrastructure customers, overlapping with K&L's core technology areas.
• Murata Manufacturing: Global leader in passive electronic components including a broad portfolio of RF filters (SAW, ceramic, chip) used across mobile, IoT, and wireless infrastructure — overlaps with K&L's filter and duplexer core offering, particularly on ceramic and lumped-element topologies.

Emerging players

• Anritsu (RF Components Business): While primarily a test-and-measurement equipment maker, Anritsu also produces RF components and switches used in instrumentation and communications — a partial overlap with K&L's switch and filter portfolio for test and measurement customers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/klmicrowaveinc

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about K&L Microwave