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RF / Microwave Filters, Diplexers & Duplexers
Manufacturers & Services

The companies listed here can supply your needs for any type of filter. They provide not only a stock of off-the-shelf models, but can also design and manufacture custom models for meeting specialty selectivity, group delay, insertion loss, form factor, power handling, or other unique parameters.

Everyone is clear on what a filter is, but there exists a lot of confusion over what is the difference between a duplexer and a diplexer. As you might expect, there are a lot of opinions - even between manufacturers. Traditionally, duplex communications implies the ability to transmit (Tx) and receive (Rx) on the same channel simultaneously. doing so requires a means of separating the transmit and receive paths in a manner rendering them independent of each other, i.e., isolation. Thus, a duplexer is used. One method is to use a circulator for routing signals from the transmitter to the antenna while routing singles from the antenna to the receiver. If the Tx and Rx operate at different frequencies, the job can be accomplished by a set of filters with a common feed point. A diplexer is usually thought of as a set of filters, again with a common feed point, that is used to combine or split signals travelling to or from an antenna, respectively, while providing isolation between the two independent paths. If more than two independent paths are required, the name for both usually changes to a common term: multiplexer.

Filter, Diplexer & Duplexer Design Books     Filter Design Data

My policy is to only list companies that actually manufacture product or offer services related to the page title subject. Product distributors and sales representatives are not listed (they have their own page). This helps guarantee that each listing offers a unique product or service. NOTICE: I am no longer adding hyperlinks due to so many companies asking to be removed because of some issue with Google Statistics. Your best bet is to use a search engine to find company websites directly. If you are interested in advertising, please visit my Advertising information page.
Anatech Electronics
RF and microwave filters
for commercial and
defense applications
Anatech Electronics designs and manufactures the industry's widest range of RF and microwave filters at frequencies up to 40 GHz, as well as power dividers, directional couplers, and many other product types. We specialize in standard and custom designs for commercial wireless, public safety, satcom, and defense applications, and we can meet stringent military environmental specifications.

Anatech Electronics FlitersAnatech Electronics Surface Mount FiltersContact us with your
custom requirements!

    973-772-4242
anatechelectronics.com


Check out our product capabilities
   Bandpass Filters
   Lowpass Filters
   Highpass Filters
   Duplexers
   Triplexers
Multiband Multiplexers
Power Dividers
Directional Couplers
Attenuators
Terminations

Buy standard models fast... online.
ISO-9001-2000 logoWe have hundreds of standard products available for immediate delivery at our Web store.

Check them out at AMCrf.com!

 

Please click here to visit KR Electronics.KR Electronics
Avenel, NJ
Tel:  (732) 636-1900
KR Electronics connectorized filtersFor over 40 years KR Electronics has designed and manufactured high quality filters for the commercial and military markets.

KR Electronics manufactures all filter KR Electronics SMT filterstypes and individually synthesizes filters for special applications. State of the art computer synthesis, analysis and test methods are used to meet the most challenging specifications.
Custom & Standard Filters
Low Cost & High Performance
Bandpass
Lowpass
Anti-Aliasing
Linear Phase
Phase Matched
Absorptive
Coils & Transformers
Highpass & Notch
Diplexers
Equalizers
Surface Mount
Fast Response
DC to 9 GHz
Root & Full Cosine

KR Electronics logoKR Electronics ISO certificate
ISO 9001:2008 Certified
Prototypes to Production
J-STD-001 Certified Operators

 

Electro-PhotonicsElectro-Photonics
772-485-0927
Palm City, FL
Electro-Photonics LLC is a global supplier of RF & Microwave components. Our products include SMT hybrid couplers, wire bondable passive components, coaxial products, test fixtures and very useful test boards for evaluating components. The Electro-Photonics team can support your small R&D design requirements with RF & Microwave test fixtures and save you valuable design and characterization time.
• Passive RF Components
   -  RF & microwave amplifiers
   -  Wire-bondable quartz spiral inductors
   -  Wire-bondable single-layer capacitors
   -  RF & microwave power dividers
   -  Coaxial cable assemblies & connector adapters
   -  90° SMT hybrid couplers
   -  Ceramic RF & microwave filters
   -  Thin film sub-mounts & mounting tabs
• Build-to-Print Services
   -  Alumina, beryllium oxide, Al nitride, quartz, CVD
   -  MMIC package design
• Custom Evaluation Boards
   -  Evaluation boards per manufacturers' layouts
   -  Layout optimization
   -  SOLT de-embedding

 

Please click here to visit the Isotec websiteISOTEC
Great Neck, NY
Phone: 516-780-2766
Fax: 718-321-9121
Since our inception in 1996 in Korea, ISOTEC has been a leading manufacturer of RF and Microwave Connectors such as SMA, MCX, SSMB, Low PIM, N, 7/16 type, etc., and RF Components such as Attenuators, Terminations, Power Dividers and more, for wireless service providers, and other RF systems designers.
We provide recognized and trusted products and service to our customers in more than 60 countries worldwide. ISOTEC offers also an extensive product mix with RF Filters and Multiplexers and others.

ISOTEC is ISO-9001 and ISO-14001 registered.
 RF Connectors:
       SMA, MCX, MMCX, SMB, BNC, TNC, SSMB
       SSMC, QMA, SMP,LOW PIM N and 7/16
 RF Components:
      Attenuators, Terminations, Power Dividers,
      Directional Couplers, Arrestors, LNAs, etc.
 RF Cable Adaptors:
      Between-series and within-series adaptors
 RF Coaxial Cable Assemblies:
      Semi-Rigid, Semi-Flexible, Flexible Cables
 RF Filters:
      Cavity, LC Filters, and Multiplexers

 

Please click here to visit JQL Electronics. JQL Electronics, Inc
Buffalo Grove, IL
Phone: 1-888-236-9828
sales@jqlelectronics.com


Technology on the Move
JQL Electronics specializes in isolator and circulator designs and production. Over the past few years, JQL has expanded its technical capability in product development. Our engineering and technical support team has gained extremely valuable experience in designing products that can meet both high performance requirements and aggressive cost targets. Along with our sales team who works with customers closely to understand their needs, our design team consistently works to realize our customers' vision and deliver the best solutions. JQL also recognizes new industrial trends and the proactively develops new products and solutions to meet those new directions.
Microwave Isolators & Circulators
300 MHz ~ 120 GHz, up to 250 W
 Coaxial  Drop-In  Surface Mount
 Microstrip  Waveguide  Iso-Adapters
Other Microwave Components
 Power Dividers  Power Combiners
 Ceramic Filters  Directional Couplers
 Power Supplies  Power Transformers
 Ferrite Garnet  Waveguide to Coax Adapters

 

Please click here to visit the NuWaves Engineering website.NuWaves Engineering
Middletown, OH
Tel: (513) 360-0800
NuWaves Engineering is a premier supplier of Radio Frequency (RF) Systems, Subsystems, RF Products and Engineering Design Services designed to customer requirements. We are a turnkey provider for RF and Microwave communication custom designs with full project management and design responsibilities; taking ownership from the conceptual idea to production.

Design / Consulting Services

 • Low Noise Designs

Prototype Development

 • Reliability Analysis

Distribution Systems

 • RF Amplifiers

Microwave Techniques

 • Site Surveys

System Integration

Products

 • Antennas

Telemetry Transmitters

 • RF Tuners

Bi-Directional Amplifiers

 • Up/Dn Converters

Frequency Modulators

 • Low Noise RF Front
   End Amplifiers

Custom Analog and
   RF Filters

 • Complete RF and Wireless Data Transceivers

Synergy MicrowaveSynergy Microwave
Paterson, NJ
973-881-8800

Synergy Microwave Directional CouplerSynergy Microwave, a privately owned and operated company, has been designing and manufacturing passive and active RF and microwave components since 1983. With more than 30 patents owned, we are constantly striving to serve this industry by providing products that exploit all modern technologies and Synergy Microwave Transformermethods, while also supporting installed bases of equipment. ISO 9001 certification, a continuous improvement quality program, and low, competitive prices have always been Synergy's mission. Global distribution assures availability when you need it.

Our Extensive Product Line Includes

Synergy Microwave Frequency MixerVCOs  • OCXOs  • SAW Oscillators
• Frequency Synthesizers  • DROs
• Power Couplers  • Power Dividers
• Power Combiners  • Mixers  • Modulators
• Demodulators  • Frequency Doublers
Monolithic Amplifiers  • Phase Comparators
• Phase Detectors  • Phase Shifters
• Switches  • Filters  • DC Blocks  • Attenuators
• Transformers  • Test Fixtures  • Eval Boards
SYNFLEX Coaxial Cables

 

Click here to visit the Networks International websiteNetworks International Corporation (NIC)
Overland Park, KS
Tel: 913-685-3400
Networks International Corporation (NIC) is a leading manufacturer of custom RF & Microwave Filters and Assemblies. For over 20 years, we have been a trusted partner for military, commercial & space solutions. NIC headquarters is located in Overland Park, KS with additional sales and manufacturing operations in Washington, DC and India. NIC is certified as a Small Disadvantaged Business (ISO 9001:2000)
Filters
 • Miniature Lumped Element
 • Combline & Interdigital
Crystal
Ceramic
RF Assemblies
 • Filter/Limiters
 • Switched Filter Banks
 • Radar Systems
 • RF Modules
Filter/Amplifiers
Phase Shifters
Diplexers
Multiplexers
Crystals / Oscillators
 • Discriminators (455 kHz to 160 MHz)
 • Surface Mount Crystals (1.8 MHz to 200 MHz)
 • TCXOs and VCTCXOs
Space Qualified Products

 

Please click here to visit Nortec RFNortec RF
Mount Laurel, NJ
856-793-9255

Nortec RF has more than 22 years of experience designing power combiners and dividers, directional couplers, hybrid couplers, filters, and power amplifiers. Our research and development group and engineering team constantly introduces new, top of the line products into our product line.

 ¤  Combiners and Dividers
     - 2-, 3-, 4-, 6-, 8- and 16-way
     - Frequency range of 88 MHz to 2.7 GHz
     - Power levels up to 150 W

 ¤  Directional Couplers
     - 20, 30, and 40 dB Uni- and Bi-directional
     - Frequency range of 380 MHz to 3 GHz
     - Power levels up to 200 W
     - <0.1 dB insertion loss,  >20 dB directivity

 ¤  90° Hybrid Couplers
     - Frequency range of 250 MHz to 2.5 GHz
     - Power levels up to 150 W

 ¤  RF/Microwave Filters
     - Lowpass and Bandpass, lumped or microstrip
     - Frequency range of 200 kHz to 2 GHz
     - Power levels up to 5 W of CW
    - <1 dB insertion loss for most designs

 ¤  RF/Microwave Amplifiers
     - 60 to 500 MHz, up to 10 W (+40 dBm)

 

Please click here to visit the Planar Monolothics Industries websitePlanar Monolothics
Industries

Frederick, MD
(301) 662-5019
PMI's organization has been setup to Design, Develop, Manufacture, Test, and Market complex state-of-the-art Hybrid RF MIC and MMIC Components, Supercomponents, and Subsystems.
PMI - LNAPMI - subsystemUnique products for applications in space, military, commercial, PMI - limitertelecommunications, and consumer electronics systems. DC to 40 GHz.
ISO 9001:2008
Select from PMI's Extensive Line
• Amplifiers
    LNA, VGA, Cryogenic
    Waveguide, Limiting
• Phase Shifters
    Analog, Digital• Detectors
• Switch Products
• VCOs & DTOs
• Multifunction Modules
• Integrated Modules
• Limiters
• Filters
    LP, HP, BP, BR,
    lumped, combline,
    switched
• Attenuators
• I/Q Modulators
• Bi-phase Modulators
• Power Dividers
• Quad Couplers
• DLVAs & SDLVAs
Custom Design to Your Specifications

 

Skyworks Wireless Connectivity Products Skyworks Solutions
Woburn, MA / Worldwide
Contact Us
Skyworks product selection guides
Selection Guide
Skyworks Solutions is an innovator of high performance analog semiconductors. Leveraging core technologies, Skyworks supports automotive, broadband, wireless infrastructure, energy management, GPS, industrial, medical, military, wireless networking, smartphone, and tablet applications. See the list below for our extensive line of products for the microwave and wireless industries, or click on the Selection Guide.
Amplifiers
 • Cellular
 • WiFi Connectivity
 • Wireless Infrastructure/
    Femtocell Power Amplifiers
 • Smart Energy-Connected
    Home and Automation
 • BDS/GPS/GNSS
 • Broad Market LNAs and
 • Low Noise Transistors
 • Driver/Linear Amplifiers
 • Gain Block
 • Variable Gain Amplifiers
Attenuators
Circulators / Isolators
Front-End Modules
 • Cellular
 • WiFi Connectivity
 • Smart Energy-Connected
    Home and Automation
 • BDS/GPS/GNSS
Mixers Modulators / Demodulators
OptoCouplers OptoIsolators
PLLs/Synthesizers/VCOs
Power Management
RF Passives
Switches
Diodes
Filters

 

Click to visit ReactelReactel, Inc.
Gaithersburg, MD
301-519-3660
Established in 1979, Reactel is an industry leader in the design and manufacture of RF and Microwave filters, diplexers, and sub-assemblies. We offer a line of filters covering DC-50 GHz.
The latest in CAD/CAM methods and equipment in all of our design and manufacturing processes are used. We feature a modern, well-equipped machine shop complete with multiple CNCs, which gives us the ability to produce long production runs quickly and economically.
Our testing department is equipped with the latest in Agilent Technologies Network Analyzers offering quick, dependable, and accurate measurements.
Select from Our Complete Line of Filters
  • Suspended Substrate Filters
  • Ceramic     • Wireless Bands
  • Switched Filter Banks     • Flat Pack
  • LC     • Miniature LC     • Waveguide
  • Combline & Interdigital     • High Power
  • Cavity     • Miniature Cavity     • Tubular
  • Suspended Substrate Diplexers & Multiplexers
ISO 9001 Certified / RoHS Compliant

 

Click to visit the RFtronics websiteRFtronics LLC
Corona, CA
888-727-3029
RFtronics develops both turnkey and custom solutions for the RF telecom equipment designers and manufacturers. Currently, our product line includes high power couplers, splitters/combiners and filters between 1 MHz and 3 GHz.
We have a tight relationship with a local, ISO certified manufacturer with a 25 000 sq. ft. facility and more than 20 years experience in the RF/microwave design and manufacture. This gives us the best of both worlds, the agility of a small company and the production capabilities of a larger-sized, high-volume manufacture.
RFtronics will usually deliver prototype quantities (less than 50 pcs) directly and for larger orders the design will be transferred to our manufacturing partner.

Broadband RF Power Components

    • Dual Directional Couplers
       • In-Phase Dividers/Combiners
          • Quadrature Dividers/Combiners
    • 3-Way Splitters / Combiners
        • Notch Filters
           • Harmonic Filter Banks
Worldwide shipping available.
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RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
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