K&L Microwave designs and manufactures a full line of radio frequency (RF) and microwave filters and duplexers for military and homeland security defence electronics programmes.
The company also supplies an array of subassemblies, including ceramic, lumped element, cavity, waveguide and tunable filters.
Signal filters for military and commercial applications
K&L’s commercial products include high-performance receive and transmit filters, delay line filters, duplexers and diplexers, combiners, receive multi-couplers, wireless system assemblies for base station requirements, and lower-cost ceramic and lumped element parts.
Applications include satellite communications, radar, radio communications, fire control radars, telemetry applications, missile guidance systems, mobile radio base stations, and air traffic control and communications.
Customisable lumped element filters with varying configurations
K&L Microwave offers lumped element filters with a broad selection of frequencies, topologies and mechanical configurations.
Implementing standard packages has enabled the company to provide custom units while minimising turnaround times.
Key features include:
- Bandpass, lowpass, highpass, bandreject
- Passband bandwidths 3% to greater than 100% of centre frequency
- 500KHz to 20GHz
- Multiplexers: 2 to 10+ channels available
- Operating temperatures from -55°C to 85°C
- Available potted for adverse vibration environment
- Chebychev, bessel, gaussian, transitional gaussian, pseudo-elliptic transfer functions
- Available amplititude and phase matching, equalisation and custom packages
- Space flight heritage products
Cavity filters for effective parameter enhancement
K&L Microwave’s standard cavity filters offer high-performance characteristics that enhance parameters such as insertion loss and power-handling capacity through a special package design.
The filters key features comprise a frequency range from 30MHz to 94GHz; a bandpass and bandreject; passband bandwidths of 0.1% to 50% of centre frequency; chebychev, bessel, gaussian, transitional gaussian and pseudo-elliptic transfer functions.
Mixed technologies, high-pass and low-pass configurations are also available, as well as multiplexers, custom packages and space flight heritage.
Dielectric resonator filters for stable temperatures and low-insertion loss
K&L’s dielectric resonator filters are available with a basic Chebycheve design.
Connectors available are subminiature version A (SMA) and RF pins. Ceramic resonators enable this filter series offers superior temperature stability levels and low insertion loss.
The dielectric resonator filters’ key features include bandpass and bandreject frequencies between 270MHz and 3GHz, passband bandwidths between 1% and 30% of centre frequency, and sealed and open frame options.
Suspended substrate filters for broadband filter interconnection
The suspended substrate medium is useful for realising broadband, highly selective filters.
High-pass and low-pass filters can be interconnected to form broadband bandpass filters or diplexers, and several other structures can be printed on suspended substrate, such as combline, interdigital, hairpin and bandstop filters.
These designs improve temperature stability compared to other printed circuit realisations since the fields are mainly in air rather than in a dielectric. Interior enclosure walls hold the circuit and prevent movement that could be caused by vibration or mechanical shock.
The suspended substrate filters comprise a frequency range of 2MHz to 18GHz, as well as bandpass, low-pass, high-pass and bandreject, passband bandwidths of 50% to 100% of centre frequency and available multiplexers and custom packages.
Multi-function assembly by filter configuration
K&L Microwave custom-configures an array of filters into an integrated product assembly to minimise the development cycle time.
Multifactor authentication (MFA) products enable the customer to allow K&L Microwave to offer a turnkey solution to their more complex filtering requirements.
Key product features include manually or computer-controlled tunable bandpass and bandreject filters, as well as switched filter banks, filter / (LNA) assemblies and filters with limiters.
About K&L Microwave
K&L Microwave (MPG Salisbury) is a subsidiary of Dover Corporation, a diversified global manufacturer with annual revenues exceeding $7bn.
K&L is recognised by top-tier defence contractors and wireless infrastructure providers as a world leader in the design and manufacture of RF and microwave filters, duplexers, and integrated assemblies. K&L is AS 9100 and ISO 14001 certified and offers customers the most extensive range of filter-based products in the industry.
K&L began operations nearly 50 years ago in a 1,400ft² facility manufacturing custom filters primarily for the military sector.
Today, with manufacturing facilities in the US and the Dominican Republic totalling 200,000ft², K&L is the industry’s premier filter supplier for the global military and commercial markets.