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Attenuators, Bias-Ts, & Terminations
Fixed | Variable | Programmable)
Manufacturers & Services

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The companies listed here can supply your needs for any type of attenuator, be it fixed, variable, or programmable. They provide not only a stock of off-the-shelf models, but can also design and manufacture custom models for meeting specialty decibel values, form factor, power handling, or other unique parameters.

One important thing to keep in mind is that specified values for attenuation 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 attenuation value will be.

I provide an online attenuator calculator here.      Attenuator Design Data

Aeroflex KDI, Inc | aeroflex.com/ams/kdi-rp/micro-kdi-rp-prods.cfm | 973-887-5700 | Whippany, NJ
Attenuators, phase shifters, digital time delay units, LNA's, switches, modulators, dividers combiners & couplers, ferrites, levelers, duplexers, amplifiers, resistors, terminations.

Bird Electronic Corp | bird-technologies.com
440-248-1200 | Cleveland, OH
High & low power, DC - 3 GHz, fixed, broadcast, wireless, filters, miniature coaxial couplers, combiner/divider 50 Ohm selector switches.

BroadWave Technologies | broadwavetechnologies.com
317-346-6101 | Franklin, IN
Adapters, attenuators, power combiners, power dividers, power couplers, terminations, high power, 1-1500 Watts, connectors, adapters.

Channel Microwave (now Smiths 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, couplers terminations, isolators, circulators, power dividers.

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.

Cougar Components (now Teledyne Cougar)
cougarcorp.com
408-522-3838 | Sunnyvale, CA
RF and microwave cascadable amplifiers and subsystems in 100 kHz to 12 GHz range. Detectors, limiters, limiting amplifiers, attenuators, AGC amplifiers, oscillators w/MMIC amplifiers.

Diablo Industries (now DITF - Interconnect Technology)
ditf.com
775-782-1041 | Minden, NV
Produces thin film sputtered and etched circuits, fabricates RF microwave components such as mixers, attenuators, combiners, amplifier substrates and filters. We are a build to print service and can fabricate in volumes; servicing the microwave, optronics, aerospace markets.

DS Instruments | dsinstruments.com
805-242-6685 | San Luis Obispo, CA
RF & microwave test equipment and specialized hardware in smaller form-factors and at lower cost than previously available. All hardware design, firmware development, and assembly is based in the USA. Current offerings include tracking and microwave signal generators, microwave digital step attenuators, and in the near future a compact signal power meter and frequency counter capable of reaching nearly 8 GHz.

Dynamic Signal (now National Instruments)
sine.ni.com/nips/cds/view/p/lang/en/nid/1485 | 800-982-4064 | Medfield, MA
RF connectors: BNC-SMA-SMB-F-N-UHF-MCX-TNC; Custom cable assemblies: mix and match lengths/connectors; Adapters | terminators | attenuators; Single mode & multimode fiber optic cables: LC-SC-ST-MTRJ; Bulk coax cable: RG6-RG8-RG58-RG59-RG142-RG213-RG223-RG400; cable tools & accessories.

EMC Technology Florida RF Labs | emc-rflabs.com
800-544-5594 | Stuart, FL
Coax, cable, hybrid couplers, thin film resistive products.

FM Ingenierie (now Ormelabs)
ormelabs.com/fr | +33 951486698 | France
Programmable attenuators, frequency synthesizers, RF filters, ISM-band ID systems, custom design, Smith Chart software.

Herley | herley.com
717-735-8117 | Lancaster, PA
Attenuators, modulators, power dividers, oscillators, synthesizers, phase shifters, switches.

High Sierra Microwave | hsmicrowave.com
530-644-3393 | Camino, CA
Designs and builds PLL signal sources, up/down converters, low noise amplifiers, and comb marker generators (weak signal sources). Also provides RF/microwave test/measurement services, such as phase noise measurements to 40 GHz.

Hittite Microwave Corp | hittite.com
978-250-3343 | Chelmsford, MA
Amplifiers, attenuators, frequency multipliers, mixers, modulators, prescalers, switches, VCOs.

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.

Ion Beam Milling, Inc | ionbeammilling.com
603-644-2326 | Manchester, NH
Since 1982 has manufactured thin film circuits for use in the microwave and photonics industries. Dry etch ion beam milling process to ensure a high level of repeatability. An array of standard products are ready to ship and we can create custom circuits to match your drawing. Ion Beam Milling also specializes in services. We can offer photolithography, milling, and/or dicing services to meet your needs. ISO 9001:2000 qualified.

Link Microtek | linkmicrotek.com
44 (0)1256 355771 | Basingstoke, Hampshire, UK
Horn antennas, rotary joints, OMTs, attenuators, TEM cells, filters, couplers, transitions, millimetre wave components, adaptors, terminations and custom waveguide assemblies. DC to 40 GHz.

LUXCONN Technology | luxconn.co.kr | 82-2-2026-7500 | Seoul, Korea
Manufactures RF connectors, coaxial cable, and passive components including power splitters, power dividers, directional couplers, surge arrestors, terminators, duplexers, antennas.

M/A-COM (now Cobham)
cobham.com | 800-366-2266 | Lowell, MA
Developer and high-volume manufacturer of RF, microwave and millimeter wave semiconductors, components and technologies including diodes, semiconductors, transistors, passives, blocks, substrates. 

MicroLab/FXR | microlab.fxr.com973-992-7700 | Livingston, NJ
Attenuators, bias tees, couplers, dc blocks, coaxial junctions, terminations, low pass filters, power splitters/dividers, tuners & line stretchers, waveguide dummy loads.

Micronetics (now Mercury Systems, Inc.)
micronetics.com
603-883-2900 | Hudson, NH
Test equipment, noise sources, voltage controlled oscillators, switches, limiters, phase shifters, attenuators.

Microtech, Inc | microtech-inc.com
203-272-3234 | Cheshire, CT
Waveguide rotary joints, bends, straight, twists, adapters, couplers, horns, terminations, tees.

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

Midwest Microwave (now Emerson Network Power)
emersonnetworkpower.com/en-US/Pages/Default.aspx | 734-429-4773 | Saline, MI
Attenuators,  terminations, DC blocks, couplers, power dividers, equalizers, phase shifters, adapters, cable assemblies, connectors - SMA, BMA, N Type, 7 mm, 3.5mm, QPL/DSCC approved products, tools, gauges, guides.

Miteq | miteq.com
631-436-7400 | Hauppauge, NY
Amplifiers, mixers, frequency multipliers, passive power components, solid-state switches, attenuators, power dividers, RF & IF signal processing components, oscillators, frequency synthesizers, integrated multifunction assemblies, fiber optic products, up/downconverters, test translators, IF/video equalizers, redundancy switchover units, video modulators and modems.

Nikkohm Co., Ltd | nikkohm.com
+81-176-53-2105 | Misawa, Aomori, Japan
Resistors, precision thin film, precision chip, RF termination, attenuator, power, TO220, TO247, TO126, wire wound, metal housed, current detect, shunt, thermopiles.

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.

Planar Monolithics Industries | pmi-rf.com
301-662-5019 | Frederick, MD
PMI designs, develops, manufactures, tests, and markets hybrid RF/microwave and monolithic integrated circuits (MIC/MMIC) and components hybrid MIC/MMIC supercomponents and subsystems.

Renaissance Electronics Corp | rec-usa.com
978-772-7774 | Harvard, MA
Transmitter combiners, receiver multi-couplers, isolators, circulators, directional couplers, power dividers/combiners, terminations, DC-26.5 GHz, coaxial, multi-position, x-fer.

Res-net Microwave | res-netmicrowave.com
727-536-7861 | Largo, FL
Manufacturer of  attenuators, RF terminations, and microwave resistors for the RF and microwave industries.

Response Microwave | responsemicrowave.com
978-772-3767 | Devens, MA
Manufacturer of drop-in and connectorized hybrids & couplers, combiners & dividers, filters & diplexers, isolators & circulators, coaxial & optical attenuators & adaptors, terminations, surge protection, delay lines, connectors, cable & cable assemblies, laser diodes, and custom assemblies.

RF & Connector Technology | rf-ct.com
+82 505 274 0002 | Suwon, Kyounggi ,Korea
Coaxial connector, cable assembly & RF passive components.

RFHIC Corporation USA | rfhic.com/eng | 919-342-7099 | Cary, NC
CATV hybrid line amplifiers, broadcasting amplifiers, FTTH amplifiers, digital TV application, MMIC (GaN, GaAs), high power transistors (GaN), low noise, wideband, & radar pallet amplifiers, PLLs, mixers, directional couplers.

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

Spinner | spinner-group.com
770-263-6326 | Norcross, GA
Coaxial connectors, cable assemblies, directional couplers, phase shifters, filters, stub tuners, DC breaks, coaxial loads and attenuators, waveguide components, coaxial and waveguide switches, lightning protectors, audio/video broadcast (analog and digital) components, accessories for network analyzers including calibration kits, gauges, articulated lines, push-on connectors, connector-savers.

State of the Art | resistor.com
800-458-3401 | State College, PA
Thick, thin film chip, surface mount, high reliability, 50 ohms, up to 20 GHz resistors, coplanar chip attenuators, thick film jumpers.

Suncoast Microwave, Inc | suncoastmicrowave.com
727-573-1280 | Clearwater, FL
Quality, cost effective waveguide components including flexible, terminations, adapters, and couplers.

US Microwaves | usmicrowaves.com
408-970-9680 | Santa Clara, CA
Products include attenuators, diodes, inductors, substrates, capacitors, dividers, resistors, terminations, couplers, filters, MMICs, LDOs.

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

vidaRF | vidarf.com
877-777-8432 | Lancaster, MA
Designs and manufactures reliable and cost-effective RF | Microwave components including connectors, adapters, terminations, cable assemblies, antennas, converters (baluns), surge protectors.

Vidyut Yantra Ydyog | vyu-microwave.com
91 1232 242223 | India
Manufacturer of microwave and millimeter waveguide components, antennas, & attenuators.