Circulators & Isolators
Manufacturers & Services
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
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|Kete Microwave Electronics Co., Ltd. specializes in designing and manufacturing
state of the art RF/Microwave passive components solution.
RF/Microwave passive components
solutions including isolator/circulator, RF resistors, power divider/combiner, terminations,
attenuators, 3dB hybrid coupler, multilayer chip ceramic capacitors, feed-through capacitors,
Connectorized, surface mount, drop-in, and waveguide versions available.
| • Filters
• RF Switches
|• Power Dividers
• Power Combiners
• RF Amplifiers
• Directional Couplers
• 3 dB
|Standard catalog products can be modified, or new designs developed, to meet
special requirements, please tell us your need, we'll be happy to work with you.
|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.
|» Straight » Bend
» Twist » Transition
» WG to Coax Adapter
|» Fixed » Variable
|» Single, Dual-Channel
» Circulator » Isolator
|» Low, Med, High Power
» Short Circuit
||» Fixed Attenuator
|» Standard Gain Horn
» Wideband Horn
AFT Microwave | aft-microwave.com
+49 7191 9659 0 | Germany
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
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,
Channel Microwave | channelmicrowave.com
| Camarillo, CA
Coaxial and waveguide isolators, circulators, ISO-adapters, integrated
assemblies, filters, terminations.
Charter Engineering | ceiswitches.com
| Largo, FL
Electromechanical switches, attenuators, isolators, terminations, circulators,
power dividers, couplers.
Corry Micronics | cormic.com
724-940-7556 | Corry,
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,
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,
Planar, horn, 8.2 GHz to 110 GHz antennas, waveguide isolators & circulators,
switches, adapters, connectors.
EM Design, LLC | em-design.com
| 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.
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
Morgan Hill, CA
|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.
Nova Microwave is a subsidiary of Electro Technik Industries
2 Danforth Drive
Easton, PA 18045
|Orbel Corp. is the leading designer and manufacturer of
RF Shielding and EMI/RFI Isolation Products
for printed circuit boards and electronic enclosures.
| • Board Level Shielding
||• EMI Contact Strips and Rings
| • Be. Cu. Finger-Stock Gaskets
||• Metalized Fabric Gaskets
| • Custom and Finger Stock
||• Connector Gaskets
standard and custom board level shielding (BLS) offers unlimited design flexibility for surface-mount and through-hole
specializes in thin gauge Photo
Etched Metal Parts and Precision Metal
Stampings made from a wide variety of material options. We manage every aspect of metal stamping from design,
prototyping, short to medium runs and high volume stamping.
|• Electrical Contacts
• Battery Contacts and Tabs
• Custom ESD/Grounding
• Modified Standards
• Brackets & Washers
• Circuit Board Stiffeners
• Springs • Metal
• Antennas • Lead Frames
Photo Etched Parts
We provide a wide range of
high quality RF and microwave products with quick delivery time at very competitive low prices. Our products include
coaxial connectors and adapters, circulators, isolators, low noise amplifiers, power amplifiers, broadband amplifiers,
terminations and more, covering the frequency range of 100 MHz to 110 GHz.
High Power Attenuators & Terminations
High Power Waveguide Terminations
Isolators and Circulators
SMA Connectors & RPSMA Connectors
High Power Waveguide Terminations
Low Noise & Power Amplifiers
Subsystems & Frequency Converters
Waveguide Switches, Couplers, more
|We also provide technical consulting services and engineering contracts which include antenna design, electromagnetic
structural analysis, and low cost manufacturing of RF/microwave circuits and systems. We can custom design our products
for your systems and/or make them integrated parts of your products for low cost production.
Filtel | filtel.com
450-455-6082 | Canada
Couplers, power dividers, isolators,
coaxial & waveguide circulators.
Innertron | innertron.com
| 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) |
631-467-8400 | Ronkonkoma, NY
Amplifier configurations such as tetrode
tubes, TWTs, klystrons, and solid state devices. Standard horn antennas and TEM cells.
MCLI | mica-mw.com
| St. Petersburg, FL
Power dividers, couplers, isolators, circulators, waveguide
components, oscillators, filters, hybrids, attenuators, switches, terminations, amplifiers.
Mica Microwave (now Mercury Systems) |
209-825-3977 | Manteca, CA
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.
Inc | microwaveresourcesinc.com
909-627-4125 | Chino, CA
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
| South Korea
SMD, drop-in, coaxial, waveguide isolators, circulators, directional,
hybrid couplers, 2way, 3way, 4way dividers, attenuators, terminations.
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
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
| 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,
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.
613-592-6858 | Canada
Couplers, circulators, isolators, mixers,
attenuators, coupler, power amplifiers, LNA, VCO, switches, oscillators, connectors,
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
| 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,
Vector Telecom Pty Ltd | vectortele.com
+61 3 9607 8357 | Melbourne
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
Wisewave Technologies (now Ducommun Technologies) |
| 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.