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Circulators & Isolators
Manufacturers & Services

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Circulators and isolators are very handy (and necessary) devices for use when it is essential to keep RF signal flow in one direction only. Think of them loosely as a steering diode array that directs energy from one port to a specific other port (or ports). Circulators and isolators (an isolator is basically a circulator with the third port terminated in the characteristic impedance) are fundamentally 3-port devices with 120° between ports. Ferrites with special properties (known only to the sworn circulator designer brotherhood) affect the directional control. Here is a brief circulator application note from MECA Electronics.

One important thing to keep in mind is that specified values for isolation are only guaranteed at 50+j0 ohms, or whatever the characteristic impedance of the attenuator model happens to be (50 and 75 ohms most common). The farther away from the characteristic impedance the connected ports are, the farther from the spec the isolation value will be.

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Click to visit the MECA Electronics website MECA Electronics
Denville, NJ   07834
Tel: 866-444-6322
Since 1961, MECA* has served the microwave industry specific to passive components in the DC to 20 GHz frequency range.

*Microwave Electronic Components of America

MECA Short Form Catalog MECA serves all areas of the RF/Microwave industries including world class network providers, and supporting supply chain infrastructure. We have long been the "backbone" of high performance wired and air-interfaced networks such as in-building applications, satellite communications, radar, radio communications, telemetry applications, mobile radio, aviation & air traffic communications.

Rugged & Reliable Components Since 1961
Made in the USA
   •   Power Dividers & Combiners
   • •   Directional Couplers
   • • •   3 dB Hybrid Couplers
   • • • •   Fixed Attenuators
   • • • • •   Variable Step Attenuators
   • • • • • •   Terminations & Loads  (Low PIM)
   • • • • • • •   Isolators & Circulators
   • • • • • • • •   DC Blocks & Bias Tees
   • • • • • • • • •   Adapters & Cables  (Low PIM)

 

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

 

Kete Microwave RF Passive ComponentsKete Microwave
Oakland, CA
510-635-4270
Kete Microwave Electronics Co., Ltd. specializes in designing and manufacturing state of the art RF/Microwave passive components solutions.
RF/Microwave passive components solutions including isolator/circulator, RF resistors, terminations, attenuators, multilayer chip ceramic capacitors, feed-through capacitors, directional couplers, power divider/combiner,3 dB hybrid coupler, etc.
Connectorized, surface mount, drop-in, and waveguide versions available.
Product Lines Include
Kete Microwave Circulators & IsolatorsKete Microwave RF Resistors • Isolators
  • Circulators
   • Attenuators
    • RF Resistors
     • Terminations
Kete Microwave Attenuators      • Power Dividers
       • Directional Couplers
        • 3 dB Hybrid Couplers
         • High Q Ceramic Caps

Certified ISO9001-2000 and ISO 14000 Company

 

AFT Microwave
aft-microwave.com | +49 7191 9659 0 | Germany
Microwave components including circulators, isolators, waveguide and coaxial components, phase shifters, ferrites, thin film technology.

Advanced Technical Materials, Inc (ATM)
atmmicrowave.com | 631-289-0363 | Patchogue, NY
Attenuators, bias tees, coaxial cables, couplers, DC blocks, isolators, circulators, line stretchers, noise sources, phase shifters, power dividers/combiners, switches, terminations, waveguide, adapters, horn antenna.

Aerotek Company
aerotek.co.th | 662-332-5035, 311-4448 | Thailand
Coaxial, drop-in, lump, drop-in lump, flange mount circulators & isolators, 88 MHz - 18 GHz.

Cernex
cernex.com | 408-541-9226 | Sunnyvale, CA
Amplifiers, antennas, couplers, isolators, circulators, filters, diplexers, oscillators, noise sources, switches, phase shifters, transition & adapters, mixers, waveguide products, attenuators, terminations, detectors, subsystems.

Channel Microwave
channelmicrowave.com | 805-482-7280 | Camarillo, CA
Coaxial and waveguide isolators, circulators, ISO-adapters, integrated assemblies, filters, terminations.

Charter Engineering
ceiswitches.com | 727-549-8999 | Largo, FL
Electromechanical switches, attenuators, isolators, terminations, circulators, power dividers, couplers.

Corry Micronics
cormic.com | 724-940-7556 | Corry, PA
Dielectric resonators, bandpass filters, LC filters, VCOs, PLLs, patch antennas, power dividers, connectorized lumped element power dividers, directional couplers, isolators/circulators, high power hybrids, diplexers & multiplexers, attenuators, switches, cavity filters, waveguides, standard gain horn antennas.

DiTom Microwave
ditom.com | 559-255-7045 | Fresno, CA
Connectorized single and dual junction ferrite isolators and circulators for the space and defense markets. COTS and Hi-Reliability products available covering 700 MHz to 31 GHz.

Dorado International
dorado-intl.com | 206-574-0900 | Seattle, WA
Planar, horn, 8.2 GHz to 110 GHz antennas, waveguide isolators & circulators, switches, adapters, connectors.

EM Design, LLC
em-design.com | 541-878-3927 | Shady Cove, OR
Specializes in the design and fabrication of RF and microwave components, systems and sub-systems including antennas, antenna polarizers, circulators, isolators, waveguide loads, coaxial loads, microwave pulse compressors, waveguide windows, waveguide seals, waveguide shorts, waveguide couplers and microwave heating.

EMR Corporation
emr.com | 800-796-2875 | Phoenix, AZ
RF peripherals devices from 30 MHz to 2.8 GHz. Design, manufacture and systems' engineering for RF isolators, amplifiers & BDAs, filters - band pass & band reject, mobile & base station duplexers, combiners - cavity ferrite & hybrid ferrite, RX multicouplers and accessories including LNAs.

Ferrite
ferriteinc.com | 603-881-5234 | Hudson, NH
Circulators, isolators, transmitters.

Filtel
filtel.com | 450-455-6082 | Canada
Couplers, power dividers, isolators, coaxial & waveguide circulators.

Innertron
innertron.com | +82-32-816-1456 | Incheon-City, Korea
A wide selection of RF & microwave components as well as power dividers, power splitters, arrestors, bias-Ts, attenuators, terminations, directional couplers which cover the frequency range from DC to 18 GHz. Waveguide filters, diplexer, adaptor, couplers up to 40 GHz, custom designs are available to support applications for the military and commercial industries.

Instruments for Industry (IFI)
ifi.com | 631-467-8400 | Ronkonkoma, NY
Amplifier configurations such as tetrode tubes, TWTs, klystrons, and solid state devices. Standard horn antennas and TEM cells.

MCLI
mcli.com | 800-333-6254 | St. Petersburg, FL
Power dividers, couplers, isolators, circulators, waveguide components, oscillators, filters, hybrids, attenuators, switches, terminations, amplifiers.

Mica Microwave (now Mercury Systems)
rf.mrcy.com | 209-825-3977 | Manteca, CA
Circulators, isolators, mixers, equalizers, phase shifters.

Microwave Devices
mwdevices.com | 888-736-8837 | Franklin, IN
Attenuators, terminators, directional couplers, filters, isolators/circulators, cable assemblies, measurement equipment.

Click to visit Nova MicrowaveNova Microwave
Morgan Hill, CA
408-778-2746
Nova Microwave is a leader in technically differentiated electronic and radio frequency Ferrite Circulators and Isolators that connect, protect and control critical systems for the global microwave electronics market place including commercial and military wireless telecommunications. Dedicated to R&D of standard and custom design quality Ferrite Circulators and Isolators from 380 MHz to 23.6 GHz.
Circulators

Nova Microwave Drop-In CirculatorNova produces a broad range of Circulators from 380 MHz to 23.6 GHz as follows:

Drop-In Circulators
Surface Mount Circulators
Nova Microwave Connectorized CirculatorSMA Coaxial Circulators
• N Type Coaxial Circulators
Drop-In Multi-Port Junctions
• Connectorized Multi-Port Junctions
Isolators

Nova Microwave Drop-In IsolatorNova products a broad range of Isolators from 380 MHz to 23.6 GHz as follows:

Drop-In Isolators
Surface Mount Isolators
Nova Microwave Connectorized IsolatorSMA Coaxial Isolators
• N Type Coaxial Isolators
Drop-In Multi-Port Junctions
• Connectorized Multi-Port Junctions

Nova Microwave is a subsidiary of Electro Technik Industries

 

Vector TelecomVector Telecom
Melbourne, Australia
sales@vectortele.com
VECTOR TELECOM has fully instrumented microwave, millimeterwave, & antenna laboratories and production facilities. Our professional engineers have backgrounds from telecommunications, electronics, space and aviation industries. Frequencies up to 112 GHz, at globally competitive prices. Custom designs available. TQM / ISO 9001:2000 certification.
Waveguide Components
Sections
» Straight  » Bend
» Twist      » Transition
» Magic Hybrid Tee
» WG to Coax Adapter
Attenuators
» Fixed      » Variable
Rotary Joints
» Single, Dual-Channel
Functions
» Combiner/Divider
» Circulator  » Isolator
Directional Couplers
» Crossguide
» Broadwall
Terminations
» Low, Med, High Power
» Short Circuit
Coaxial Components
» Termination » Fixed Attenuator
Microwave & Millimeterwave Antennas
» Standard Gain Horn
» Wideband Horn
» Omni-Directional
» Helical

 

Microwave Resources, Inc
microwaveresourcesinc.com | 909-627-4125 | Chino, CA
Amplifiers, attenuators, circulators, isolators, frequency multipliers, waveguide couplers, mixers, detectors, filters, pin switches, adapters.

Microwave Technology Corporation (MTC)
microwave.co.th | +66-35-721-559 to 60 | Wang-noi, Thailand
Microwave passive components of isolators & circulators including coaxial from 80 MHz to 40 GHz. Drop-in or surface mounted from 400 MHz to 20 GHz. Waveguide is up to 40 GHz. Power up to power rating 500 W. Additional product waveguide adaptor & termination.

Murata Electronics
murata.com | 800-241-6574 | Smyrna, GA
Chip multi-layer (1.0 2.5 GHz), chip dielectric (2450 GHz, Bluetooth), surface mount capacitors, thermistors/resistors, coil (inductors)/delay lines, noise suppression products/EMI filters, resonators, piezoelectric sound components, coaxial connectors, antenna/duplexers, isolators/circulators, PLL modules, VCOs, TCXO, RF diode switches, DC-DC converters, sensors.

Nanowave
nanowave.co.kr | +82-43-903-4828 | South Korea
SMD, drop-in, coaxial, waveguide isolators, circulators, directional, hybrid couplers, 2way, 3way, 4way dividers, attenuators, terminations.

Pasternack Enterprises, Inc
pasternack.com | 866-727-8376 | Irvine, CA
Amplifiers to 2 GHz, attenuators 1 - 1000 W DC - 40 GHz, circulators/isolators 1 - 26.5 GHZ w/SMA connectors, combiners/dividers 2 - 12 way 1 MHz - 18 GHz, couplers low & high power 0.5 - 18 GHz, switches manual & diode DC - 18 GHz, terminations 1/2 - 100 W DC-40 GHz, waveguide 1.70 - 40 GHz.

Raditek
raditek.com | 408-266-7404 | San Jose, CA
Isolators, circulators, oscillators, synthesizers, couplers, splitters, combiners, hybrids, adaptors, cable assemblies, connectors, terminations, attenuators, bias tee's, lightning protectors.

Renaissance Electronics
rec-usa.com/home.htm | 978-772-7774 | Harvard, MA
Manufacturer of RF & microwave sub-systems and components including isolators & circulators, dividers & combiners, waveguide components, coaxial RF switches, switch matrices, base station equipment.

RF & Noise Components Ltd
rfandnoisecomponents.co.uk | +44 (0) 5601 06 69 30 | Southend-on-Sea, Essex, UK
Design & manufacturer of RF & microwave components, including circulators, isolators, combiners, couplers, dividers and power monitors. Specialising in custom designs to meet individual customer requirements. ISO9001:2008 Approved.

RF-Lambda
rflambda.com | 613-592-6858 | Canada
Couplers, circulators, isolators, mixers, attenuators, coupler, power amplifiers, LNA, VCO, switches, oscillators, connectors, adapters.

RTx Technology Co., Ltd
rtxtech.com | +82-31-743-6275 | South Korea
Filters, duplexers, multiplexers (ceramic/cavity), VCOs & PLL synthesizers, isolators & circulators, up/down converters, combiners & dividers, directional couplers, SAW devices, attenuators, terminators.

Trak Microwave
trak.com | 888-283-8444 | Tampa, FL
Attenuators, circulators, isolators, comb generators, control devices, couplers, delay line filters, GPS time & frequency, hybrids, IQ mod & demod, mixers, multipliers, oscillators, phase shifters, splitters & combiners, synthesizers, transformers.

Vector Telecom Pty Ltd
vectortele.com | +61 3 9607 8357 | Melbourne , Australia
Waveguide components and assemblies, coaxial components and antennas.

VivaTech
vivatech.biz | +1 818 547 5036 (USA)
+44 750 923 3838 (Intl Mobile)
System front-ends, mm-wave test equipment, source modules, amplifiers, active multipliers, mixers, frequency converters, frequency extension modules, radiometer front-ends, waveguide isolators, waveguide attenuators, passive and active waveguide components and primary noise standards.

Wisewave Technologies (now Ducommun Technologies)
ducommun.com | 310-513-7200 | Carson, CA
Amplifiers, antennas, attenuators, PIN diode switches, phase shifters, isolators/circulators, frequency converters, oscillators, couplers, magic tees, coax power dividers, bandpass, low pass, high pass filters, waveguide diplexers, transitions, waveguide to coax adapters, waveguide components, integrated assemblies.

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