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

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.

Aeroflex KDI | 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.

Anritsu | 1-800-Anritsu (1-800-267-4878) | Allen, TX

Attenuators & terminations; coaxial cables, connectors & adapters; o-scopes; power meters & sensors; signal generators; antenna, signal, spectrum, & vector network analyzers (VNAs); calibration kits; Bluetooth & WLAN testers; PIM testers; amplifiers; power dividers; antennas.

Atek Midas | +90 212 483 71 67 | Istanbul, Turkey

Integrated circuit (RFIC/MMIC) attenuators, power and low noise amplifiers, mixers, power dividers, filters, RF front ends.

Bird Electronic Corp | 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 | 317-346-6101 | Franklin, IN

Adapters, attenuators, power combiners, power dividers, power couplers, terminations, high power, 1-1500 Watts, connectors, adapters.

Centric RF | 800-399-6891| Allen, TX 

Stocks various RF and microwave coaxial components including attenuators, adapters, cable assemblies, terminations, power dividers, and more.

Channel Microwave (now Smiths Microwave) | 805-482-7280 | Camarillo, CA

Coaxial and waveguide isolators, circulators, ISO-adapters, integrated assemblies, filters, terminations.

Charter Engineering | 727-549-8999 | Largo, FL

Electromechanical switches, attenuators, couplers terminations, isolators, circulators, power dividers.

Clear Microwave | 610-844-6421 | Malvern, PA |

N-way dividers/combiners (reactive & resistive), high power combiners, directional couplers, 90° & 180° 3 dB hybrids couplers, RF switches, phase shifters, limiters, detectors, bias Tees, DC blocks.

ConductRF | 1-978-374-6840 | Methuen, MA

RF connectors and cables DC to 110 GHz, including RF test, internal system cables, low PIM, high power, phase matched & more. Custom connector design capability, too. VNA cables including TESTeCON. Formable semi-rigid and hand-formable solutions up to 60 GHz. Flexible cables: RG & LMR, high flex double and triple shielded options. D38999 Mil Spec. Fixed attenuators. ITAR Registered.

Corry Micronics | 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.

Custom MMIC (now QORVO)| 978-467-4290 | Westford, MA

Fabless RF and microwave MMIC designer of microwave circuits to solve various size, weight, performance, and cost (SWaP-C) challenges throughout the microwave signal chain. Off-the-shelf MMICs including amplifiers, mixers, attenuators, phase shifters, and switches. Over 25 years combined experience in MMIC chips for millimeter wave, point-to-point radio, VSAT, WLAN, and cellular systems as well as general microwave applications.

DS Instruments | 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) | | 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 | 800-544-5594 | Stuart, FL

Coax, cable, hybrid couplers, thin film resistive products.

everything RF | 312-436-0084

Find RF & microwave components, equipment and services - 216,401 products from over 1143 manufacturers listed in 275 categories. Download hundreds of vendor white papers. Test equipment amplifiers, antennas, attenuators, bias-Ts, & terminations, RF connectors & adapters, RF filters, power combiners, couplers, & dividers, RF switches, waveguide, Bluetooth & RFID.

FM Ingenierie (now Ormelabs) | +33 951486698 | France

Programmable attenuators, frequency synthesizers, RF filters, ISM-band ID systems, custom design, Smith Chart software.

Herley | 717-735-8117 | Lancaster, PA

Attenuators, modulators, power dividers, oscillators, synthesizers, phase shifters, switches.

High Sierra Microwave | 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 | 978-250-3343 | Chelmsford, MA

Amplifiers, attenuators, frequency multipliers, mixers, modulators, prescalers, switches, VCOs.

INSTOCK Wireless Components | 973-335-6550 | Boonton, New Jersey

Design & manufacture 2- thru 64-way RF power splitters / combiners from our Boonton, NJ, facility. N, TNC, BNC, SMA, QMA, RP-SMA connectors. 10 MHz through 6.0 GHz. Optimized specs for Public Safety Band, Cell, GSM 900 / 1800, PCS, UMTS, GPS, L Band, W-CDMA-3G, TETRA, IEEE802.11 b/g, UHF RFID, ISM, Wi-Fi, WiMAX and LTE wireless. Bias T's. Customization available. All products in stock. 5 year warranty.

Integrated Device Technology (IDT) | 800-223-1366 | San Jose, CA

System-level solutions that optimize applications with products in RF, timing, wireless power transfer, serial switching, interfaces and sensing solutions are among the company's broad array of complete mixed-signal solutions for the communications, computing, consumer, automotive and industrial segments. These products are used for development in areas such as 4G infrastructure, network communications, cloud datacenters and power management for computing and mobile devices.

Innovative Power Products (IPP) | 631-563-0088 | Holbrook, New York

RF & microwave high power, broadband couplers, combiners, baluns, resistors, terminations and attenuators. Product integration, custom configurations, custom resistor assemblies, contract manufacturing, engineering design.

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.

Ion Beam Milling | 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.

Isotec | 516-780-2766, USA | 82-2-2040-6176, Korea

Designs, develops and manufactures extensive line of RF/microwave connectors, cable assemblies, attenuators, terminations, couplers, filters, surge protectors, and LNAs. Low PIM designs available.

JQL Electronics | 888-236-9828 | Rolling Meadows, IL

Manufacturer of RF and microwave devices including filters, isolators & circulators, directional couplers, power divider/combiners, hybrid, termination and etc. Our R&D team provides outstanding services to quickly bring your product concepts into prototype, and turn the prototype into products.

Kete Microwave Electronics | +86-595-22597735 | China

Ferrite RF isolator & circulators, high power RF resistors & terminations, fixed & variable/step attenuators, multilayer High-Q chip ceramic& feedthrough capacitor (EMI filters), directional couplers, power dividers / combiners, 3dB hybrid couplers.

Link Microtek | 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.

Lotus Communication Systems | 888-236-8588 | Weston, MA

RF modular system components up to 20 GHz - amplifiers, filters, attenuators, limiters, oscillators, bias-Ts. COTS shielded enclosures w/SMA connectors for RF / electronics prototyping. Customization to your specification from prototype to production.

Luxconn Technology | www.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) | 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. 

MECA Electronics | 866-444-6322 | Denville, NJ

RF & microwave components for in-building, satellite, radar, radio, telemetry, mobile radio, aviation & ATC. Attenuators, directional & hybrid couplers, isolators & circulators, power dividers & combiners, loads, DC blocks, bias-Ts and adapters & cables.

MicroLab/FXR | 973-992-7700 | 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) | 603-883-2900 | Hudson, NH

Test equipment, noise sources, voltage controlled oscillators, switches, limiters, phase shifters, attenuators.

Microtech | 203-272-3234 | Cheshire, CT

Waveguide rotary joints, bends, straight, twists, adapters, couplers, horns, terminations, tees.

Microwave Resources | 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) | 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.

Mini-Circuits | 718-934-4500 | Brooklyn, NY

Attenuators, baluns, bias tee, cables (test quality), chokes, DC blocks, mixers, amplifiers, filters, line stretchers, modulators, oscillators, power combiners / couplers / splitters, switches, terminations, transformers. Surface mount, connectorized. Application (app) notes.

Miteq | 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.

MPDevice | +82-32-822-3290 | Incheon, Korea

Manufacturer of RF attenuators and terminations, coaxial connectors, adapters, and cable assemblies, DC blocks, surge arrestors, power combiner / dividers, and directional couplers.

Nikkohm Co., Ltd | +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 | 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.

Peregrine Semiconductor | 858-731-9400 | San Diego, CA

Fabless provider of RFICs leveraging the company's patented UltraCMOS® technology, an advanced form of SOI that enables the design, manufacture and integration of multiple RF, analog and digital functions onto a single chip.

Planar Monolithics Industries | 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.

QORVO | 833-641-3810 | Greensboro, NC

RFICs and packaged modules used in cellular networks and mobile phones, for wireless connectivity such as wireless LAN, GPS and Bluetooth, cable modems and cable TV infrastructure, applications including military radar. GaAs- and GaN-based power amplifiers, filters, switches, and FEMs used in smartphones, WiFi wireless infrastructure equipment.

Quantum Microwave | 857-499-0071 | Cohasset, MA

Millimeter-wave waveguide components including attenuators, detectors, diplexers, power amplifiers, mixers, isolators & circulator, multipliers, antennas, switches, probe adapters, terminations, and filters. Waveguide sections include straight, bends, twists, transitions, and adapters. Patented "GuideLock" connector eliminates screws. Cryogenic components available. Designed and manufactured at their Massachusetts facility.

QuinStar Technology | 310-320-1111 | Torrance, CA

Designs and manufactures millimeter-wave products for communication, scientific, and test applications including millimeter-wave products, microelectronic assembly, rapid prototyping, and mass customization. Amplifiers, receivers, Oscillators, switches, attenuators, circulators & isolators, filters, waveguide, antennas, and phase shifters, and transceiver & radar subsystems are offered.

RCD Radiokomunikace | +420-466-415-755 | Česká Republika

Design, manufacture, and test high-quality RF components and systems - attenuators, couplers, dividers, filters, amplifiers. Custom RF or mechanical designs including high port-to-port isolation requirements, low ohmic losses, high power, and low PIM levels. 70 MHz – 5 GHz.

Renaissance Electronics Corp | 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 | 727-536-7861 | Largo, FL

Complete line of precision RF & microwave components including attenuators, terminations, resistors, and diode detectors for commercial, military, and space applications. Products range from the small flange type to large 2,000 watt connectorized power attenuators and/or terminations at frequencies up to 26.5 GHz. In-house photo etch and laser trim capability.

Response Microwave | 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 | +82 505 274 0002 | YoungTon Suwon, Korea

Coaxial connectors & adapters, cable assemblies, RF attenuators, terminations, couplers, power couplers & dividers, DC blocks, surge arrestors, antennas.

RFHIC Corporation USA | 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 Superstore | 888-443-3427 | Denver, CO

Launched in 2017 by the founder of Pasternack Enterprises. RF coaxial connectors & adapters, coaxial cable & cable assemblies, surge protectors, attenuators. Items added daily. Free shipping on orders over $99. Same day shipping on orders received by 3 PM MT.

RF Techniques | 408-433-1941 | San Jose, CA

High reliability brazed high power resistors, high power attenuators and high power terminations in aluminum nitride (AlN), alumina & beryllium oxide (BeO) substrates for the Microwaves & RF applications. 100% manufactured in USA.

RF-Lambda | 613-592-6858 | Canada

Couplers, circulators, isolators, mixers, attenuators, coupler, power amplifiers, LNA, VCO, switches, oscillators, connectors, adapters.

SemiGen | 603-624-8311 | Manchester, NH

Prototype builds and design while handling volume production runs for the RF/microwave, military, space, homeland security, optical, medical device, commercial-wireless markets. Manual and fully automatic assembly. Also manufactures PIN, limiter, beam lead, and Schottky diodes, chip capacitors and attenuators, and printed spiral inductors.

Skyworks Solutions | 781-376-3000 | Woburn, MA

RF amplifiers, attenuators, circulators, demodulators, detectors, diodes, directional couplers, FEMs, RF subsystems, isolators, mixers, modulators, optoisolators, phase shifters, PLLs-synthesizers-VCOs, & more.

Spinner | 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 | 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 | 727-573-1280 | Clearwater, FL

Quality, cost effective waveguide components including flexible, terminations, adapters, and couplers.

US Microwaves | 408-970-9680 | Santa Clara, CA

Products include attenuators, diodes, inductors, substrates, capacitors, dividers, resistors, terminations, couplers, filters, MMICs, LDOs.

Vector Telecom | www.+61 3 9607 8357 | Melbourne , Australia

Waveguide components and assemblies, coaxial components and antennas.

vidaRF | www.877-777-8432 | Huntersville, NC

Offering High performance isolators, circulators, power dividers, couplers, RF connectors, adapters, custom cable assemblies, attenuators, and terminations. Custom designs available. In-stock items shipped within 24 hours.

Vidyut Yantra Ydyog | 91 1232 242223 | India

Manufacturer of microwave and millimeter waveguide components, antennas, & attenuators.

Withwave | South Korea | +82-070-7118-0705

Coaxial connectors and adapters, terminations, attenuators, cable assemblies, and accessories for test applications. The coaxial-to-planar T-Probe™ is useful from DC-20 GHz. VNA calibrator kits and VNA auto-calibrator.