Virginia Diodes

What Virginia Diodes does

Virginia Diodes, Inc. (VDI) is a privately held specialist manufacturer of millimeter-wave and terahertz (THz) components, subsystems, and test-and-measurement equipment, founded in 1996 by Dr. Thomas W. Crowe as a University of Virginia spin-off. The company operates from a 20,000 sq. ft. headquarters in Charlottesville, VA with approximately 100 engineers, technicians, and administrative staff. VDI's core technology is in-house fabrication of planar GaAs Schottky diodes and microelectronic filter structures, which enable its products to operate reliably from 50 GHz to over 2 THz — a frequency range where few commercial suppliers exist.

The product portfolio is organized into three layers. At the component level, VDI sells W-Band and G-Band planar diodes, waveguide amplifiers, frequency multipliers, mixers (subharmonic, even-harmonic, fundamental, and IQ), zero-bias detectors, and passive components such as filters, directional couplers, and horn antennas. At the subsystem level, the company offers Amplifier/Multiplier Chains (AMC and AMC-I), custom transmitters, MixAMC receivers, and MixAMC-I compact receivers covering 50 GHz to ~3 THz. At the test-and-measurement level, VDI offers VNAX (Vector Network Analyzer Extension), SAX (Spectrum Analyzer Extension), SGX (Signal Generator Extension), CC (Compact Converters), PSAX/PSGX (Portable Extension Modules), NTX (Noise Test Extenders), and the Erickson PM5B power meter — the de facto standard for >100 GHz power measurement. These modules are designed to be compatible with Keysight, Anritsu, Rohde & Schwarz, and Copper Mountain analyzers, and form the principal commercial interface through which VDI reaches scientific, defense, telecommunications, and semiconductor customers.

VDI generates revenue primarily through quote-based hardware sales to research institutions, defense agencies, telecom OEMs, and semiconductor manufacturers. Go-to-market combines direct sales (RFQ via [email protected]), industry conferences (IMS, EuMW, IRMMW-THz), and an exclusive/preferred distributor network covering China, Japan, South Korea, India, and Southeast Asia. Strategic channel partnerships with Keysight Technologies (including Metrology Grade Calibration Services announced February 2025) and FormFactor (MeasureOne program, joined 2020) extend VDI's reach into calibration services and on-wafer semiconductor test. Named end customers include NASA, MIT Lincoln Laboratory, Virginia Tech, University of Sheffield, Aalto University, Chalmers University, Karlsruhe Institute of Technology, LG Electronics, and Nokia Bell Labs — the latter two reflecting VDI's positioning for 6G/sub-THz communications testbeds. The company has been entirely self-funded since founding, with no disclosed venture or private equity rounds, and remains under founder/CEO Thomas W. Crowe's leadership alongside COO Gerhard Schoenthal.

Name

Virginia Diodes

Legal name

Virginia Diodes, Inc.

Website

https://www.vadiodes.com

Company type

Private

Founded year

1996

Operating status

Operating

Headcount range

101–250 employees

Short description

Virginia Diodes is a private Charlottesville-based manufacturer of millimeter-wave and THz test-and-measurement modules, components, and custom transmitter/receiver subsystems built on in-house GaAs Schottky diode technology, serving research institutions, defense agencies, telecom OEMs, and semiconductor manufacturers worldwide.

Ownership category

akta.pro rank

Product category

Millimeter-wave and THz Test and Measurement Equipment

NAICS

Semiconductor and Related Device Manufacturing (334413), Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515)

SIC

Semiconductors & Related Devices (3674), Instruments For Meas & Testing Of Electricity & Elec Signals (3825)

akta.pro primary industry

Diodes & Rectifiers (Standard/Fast/Schottky) (HDAHAHAD)

akta.pro secondary industry

RF & Compound Semiconductor Foundries (GaAs/GaN/SiGe) (HDAHACAD)

Keywords

• MmWave test equipment
• THz frequency extension
• GaAs Schottky diodes
• Vector network analyzer extenders
• Terahertz components

Headquarters

HQ city

Charlottesville

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Technology or R&D, Operations, Supply Chain, Infrastructure, Marketing or Sales

Revenue model

1. Test and Measurement Equipment Sales: VDI manufactures and sells Vector Network Analyzer Extension Modules (VNAX), Spectrum Analyzer Extension Modules (SAX), and Signal Generator Extension Modules (SGX) that extend high-performance microwave measurement tools to higher frequencies. These products form a significant portion of revenue.
2. Transmitter and Receiver Components: Sale of waveguide amplifiers, frequency multipliers, detectors, mixers, and custom transmitter/receiver modules. Includes Compact Transmitter Modules (AMC-I) and Compact Receiver Modules (MixAMC-I).
3. Custom Systems: Custom-configured THz transmitter and receiver systems for specific customer applications. Systems cover 50GHz to ~3THz and include Amplifier/Multiplier Chains (AMC) and integrated transmitters.
4. GaAs Schottky Diodes: Sale of W-Band and G-Band planar diodes in various configurations (single anode, zero-bias detector, anti-parallel, tee) for customer integration into their own products.
5. Power Meters and Accessories: Erickson PM5B power meters, calibration services, waveguide tapers, and other measurement accessories.
6. Passive Components: Waveguide filters (BPF, LPF, HPF), directional couplers, straight waveguides, tapers, and horn antennas.

Pricing tiers

Go-to-market motion1 record

Distribution channels8 records

Marketing channels5 records

Core offering

Virginia Diodes designs, fabricates, and sells millimeter-wave and terahertz test and measurement equipment, transmitter and receiver subsystems, and components based on proprietary in-house fabricated GaAs Schottky diodes. The portfolio includes Vector Network Analyzer Extension Modules, Spectrum Analyzer Extension Modules, Signal Generator Extension Modules, Compact Converters, Erickson PM5B power meters, mixers, multipliers, detectors, waveguide amplifiers, and planar GaAs Schottky diodes, enabling frequency coverage from 50 GHz to over 2 THz for research, defense, telecommunications, and aerospace customers.

Product overview

Virginia Diodes (VDI) manufactures a comprehensive portfolio of test and measurement equipment for millimeter-wave and THz applications. The product portfolio is organized around transmitter and receiver subsystems: VNAX (Vector Network Analyzer Extension) modules for network analysis; SAX (Spectrum Analyzer Extension) modules and PSGX (Portable Signal Generator Extension) modules for signal analysis; and various transmitter components including waveguide amplifiers, frequency multipliers, and AMC (Amplifier/Multiplier Chains) for signal generation. The receiver product line includes mixers (SHM, EHM, FM types), ZBD (Zero-Bias Detectors), and MixAMC modules. Supporting products include PM5B power meters, noise sources, NTX phase noise test extenders, and passive components (waveguides, filters, directional couplers). VDI also offers GaAs Schottky diodes (W and G Band) and custom transmitter/receiver systems. The products integrate with Keysight, Anritsu, and Rohde & Schwarz test equipment for complete THz measurement solutions.

Differentiator

Problem solved

Functional benefit

Products and services

• VNAX (Vector Network Analyzer Extension Modules) High-performance network analyzer frequency extension modules that extend VNA capabilities from 26 GHz to 1,100 GHz into the THz range, including Transceiver (TxRx), Transmit-Reference (TxRef), and Receive-only (Rx) modules for research, defense, and telecom test applications.
• SAX (Spectrum Analyzer Extension Modules) Broadband down-conversion modules that extend microwave spectrum analyzers into the THz range from WR28 (26-40 GHz) to WR1.0 (750-1100 GHz). Available in SAX-M (Keysight), SAX-Z-M (Anritsu), and SAX-F-M (Rohde & Schwarz) variants for research, defense, and telecom spectrum analysis applications.
• SGX (Signal Generator Extension Modules) Frequency extension modules that extend microwave signal generators into the THz range from WR15 (50-75 GHz) to WM-164 (1.1-1.5 THz), offering high test port power and TTL-controlled modulation for turn-key, sweepable signal generation across full waveguide bands.
• CC (Compact Converters) Easy-to-use compact converters for frequency up-conversion (CCU) and down-conversion (CCD) of wide band modulated millimeter-wave signals, covering WR28 (22.5-40 GHz) to WR2.2 (330-500 GHz) for telecom, research, and instrumentation applications.
• PM5B (Erickson Power Meters) Calibrated calorimeter-style power meters for 75 GHz to >3 THz applications with power measurement ranges from 1 µW to 200 mW, regarded as the de facto standard for >100 GHz power measurement.
• Noise Sources High Excessive Noise Ratio (ENR) noise sources for noise figure measurements up to 400 GHz, including waveguide isolators and +28V voltage bias compatible with spectrum analyzers.
• NTX (Noise Test Extension Modules) Modules that extend absolute phase noise test solutions from 50 GHz through 330 GHz, including waveguide splitters with dual down-converter mixer chains for cross-correlation measurements.
• PSAX (Portable Spectrum Analyzer Extenders) Compact spectrum analyzer extenders designed for handheld/portable Keysight FieldFox analyzers, extending frequency range from 50 GHz through 170 GHz for field and lab use.
• PSGX (Portable Signal Generator Extenders) High performance frequency extension modules for portable microwave signal generators such as Keysight FieldFox with pulse generator app, extending signal generation into the mmWave range for portable test setups.
• Waveguide Amplifiers Broadband and narrowband waveguide amplifiers for boosting small RF input signals, available in various power levels and frequency bands from WR19 to WR3.4 for integration into THz transmitter systems.
• Frequency Multipliers Broadband and high-power frequency doublers and triplers based on planar GaAs Schottky diode technology, ranging from WR15 (50-75 GHz) to WR0.34 (2200-3300 GHz) for THz source chain integration.
• AMC (Amplifier/Multiplier Chains) and Custom Transmitter Systems Custom-configured millimeter-wave transmit systems covering 50 GHz to ~3 THz, including Amplifier/Multiplier Chains (AMC) requiring external low-frequency input and Tx systems integrating an AMC with a low-frequency source, available in high-power or full waveguide band configurations.
• AMC-I (Compact Transmitter Modules) Integrated amplifier/multiplier chains providing industry-leading performance in compact packages, requiring user-supplied bias voltage and featuring TTL modulation and user-controlled attenuation for THz signal generation.
• ZBD (Zero-Bias Detectors) Zero-biased Schottky diode detectors for mmWave and THz applications providing high responsivity and fast response time from WR15 to WR0.65 (50-1700 GHz).
• Mixers (SHM, EHM, FM, IQ) Subharmonic (SHM), even-harmonic (EHM), fundamental (FM), and IQ mixers for frequency conversion from 50 GHz to 1700 GHz, using planar Schottky diode technology for THz receiver applications.
• MixAMC and Custom Receiver Systems Millimeter-wave receiver systems covering 50 GHz to ~3 THz; MixAMC requires external LO input while Rx systems integrate a MixAMC with a low-frequency source.
• MixAMC-I (Compact Receiver Modules) Integrated mixer/amplifier modules providing high performance down-conversion in compact packages, using a low-frequency LO input (<20 GHz) with separate IF output for THz receiver applications.
• 8-20 GHz Frequency Synthesizer Frequency synthesizer designed for THz applications, offering fast switching speed, frequency sweeping capability, and excellent phase noise characteristics to serve as a low-frequency source for VDI THz transmitter and receiver systems.
• Waveguide Filters (BPF, LPF, HPF) Low passband insertion loss filters for sideband filtering in up-converter applications, including full waveguide band bandpass filters for harmonic rejection in THz systems.
• Directional Couplers Millimeter-wave directional couplers offering low insertion loss, coupling flatness, and high directivity for THz system integration and measurement setups.
• Passive Components (Straight Waveguides, Twists, Bends, Tapers, Horn Antennas, Attenuators) Straight waveguides, twists, bends, tapers, horn antennas, and waveguide attenuators for mmWave and THz system integration.
• W and G Band GaAs Schottky Diodes Planar GaAs Schottky diodes available as single devices or in series, anti-series, and anti-parallel configurations, used in detectors, mixers, zero-bias detectors, anti-parallel mixers, and tee configurations for integration into customer products.

Quantifiable outcome

• Frequency range coverage from 50 GHz to 2 THz+ with VNA extension modules up to 1,100 GHz (1.1 THz)
• +2 more outcomes

Named customers9 records

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration8 records

Feature8 records

Partnerships

Twelve partnerships are on record, tiered core, major, regional and supporting.

• Keysight TechnologiescoreTechnology or Integration · 5 February 2025Keysight offers Metrology Grade Calibration Services for VDI Products (announced February 2025). Keysight and VDI have collaborated on 6G testbed demonstrations, D-Band Radio-on-Glass, and broadband VNA solutions. VDI VNAX modules are compatible with Keysight PNA/PNA-X analyzers.
• DMPI (Dominion MicroProbes, Inc.)majorTechnology or Integration · 25 May 2022Keysight, VDI, FormFactor, and DMPI joined forces to deliver 220 GHz broadband VNA solution. DMPI provides WR-2.2 wafer probes for high-frequency testing.
• Southeast Asia DistributorregionalChannel Partner/ Reseller/ Distributor · 26 June 2020VDI announced a new preferred distributor in Southeast Asia.
• FormFactormajorGTM or Marketing Partner · 5 January 2020VDI joined FormFactor's MeasureOne program, continuing a strong collaborative relationship to bring leading edge test and measurement solutions to customers. FormFactor's COMPASS Users' Group Conference features VDI CTO presentations.
• Chang Woo, Inc.regionalChannel Partner/ Reseller/ Distributor · 19 November 2016South Korean preferred distributor Chang Woo, Inc. completed training at VDI.
• Chalmers UniversitysupportingStrategic or Co-development Partner · 5 September 2016VDI partners with Keysight Technologies to create first system for network and spectrum analysis up to 1.5 THz at Chalmers University, Sweden.
• NASAmajorStrategic or Co-development Partner · 19 February 2016VDI partners with NASA Goddard Space Flight Center and MIT Lincoln Laboratory on CubeSat missions for cloud ice measurement. VDI provides 874 GHz and 183 GHz receivers for space-based atmospheric sensing.
• MIT Lincoln LaboratorymajorStrategic or Co-development Partner · 19 February 2016Partnership with NASA and VDI on CubeSat missions for atmospheric sensing using VDI's THz receiver technology.
• China DistributorsregionalChannel Partner/ Reseller/ Distributor · 1 April 2014Virginia Diodes announced exclusive distributors in China. Training sessions completed at VDI headquarters.
• Modelithics, Inc.supportingTechnology or Integration · 1 February 2012VDI and Modelithics partnered to provide nonlinear models for VDI diodes. Modelithics provides Keysight ADS, AWR Corp. MWO (Microwave Office) and Keysight Genesys models for W Band Single Anode and W Band ZBD diodes.
• AmTechs CorporationregionalChannel Partner/ Reseller/ Distributor · 1 October 2010AmTechs Corporation is VDI's source for products in Japan, handling distribution and customer support.
• IT Globe, Inc.regionalChannel Partner/ Reseller/ Distributor · 21 September 2010VDI announced distribution to India with IT Globe, Inc.

Scale indicators5 records

Recent moves8 records

Expansion highlights6 records

Broad incumbents

• Rohde & Schwarz: Rohde & Schwarz is a major T&M equipment manufacturer with FSW spectrum analyzers that integrate with VDI SAX-F-M modules. Offers overlapping capabilities in the wider RF/microwave T&M market, with partial THz coverage competing at the system level rather than as a specialist.
• L3Harris Technologies: L3Harris is a defense prime contractor with internal mmWave/THz capabilities for radar, electronic warfare, and satellite communications. Provides direct competition to VDI in the Defense/Military segment as a vertically integrated systems provider.
• Keysight Technologies: Keysight is the dominant commercial vendor of network and spectrum analyzers and has acquired OML Inc. (former VDI direct competitor) to offer integrated THz extension modules. Operates both as a strategic partner to VDI (calibration, testbeds) and a broad incumbent that competes at the system level.
• Anritsu: Anritsu is a leading T&M vendor with MS2850A spectrum analyzers that integrate with VDI SAX-Z-M modules. Provides broad RF/microwave test equipment that overlaps with VDI's T&M ecosystem at the system level rather than as a specialist in THz components.

Direct peers

• Spacek Labs: Spacek Labs designs and manufactures millimeter-wave and THz components including amplifiers, multipliers, mixers, and complete receiver/transmitter systems. Directly comparable to VDI in product mix and the defense/scientific research customer profile.
• RPG Radiometer Physics GmbH: RPG produces THz and millimeter-wave receiver front-ends, radiometers, and quasi-optical components for atmospheric and security sensing. Comparable to VDI's high-frequency MixAMC, frequency multipliers, and custom receiver modules serving scientific and atmospheric sensing customers.
• QuinStar Technology: QuinStar manufactures millimeter-wave and THz components, subassemblies, and integrated subsystems for defense, aerospace, and commercial applications. Closely comparable to VDI's mix of mixers, multipliers, amplifiers, and integrated transmitter/receiver modules across overlapping frequency ranges.
• Smiths Interconnect (Millitech / Farran): Smiths Interconnect's Millitech and Farran divisions produce mmWave components, subassemblies, and integrated modules for defense and commercial applications. Comparable to VDI in offering mixers, multipliers, amplifiers, and integrated subsystems for radar, communications, and sensing at THz frequencies.
• Eravant (formerly SAGE Millimeter): Eravant manufactures passive and active millimeter-wave components (waveguides, antennas, frequency extenders, mixers) covering DC to 330 GHz. Comparable to VDI's waveguide components, mixers, amplifiers, and frequency extension product portfolio for similar commercial and research customers.

Emerging players

• Custom MMIC: Custom MMIC designs and supplies GaAs MMIC amplifiers and components for mmWave applications, focusing on smaller foundries and design services. Comparable emerging player in the GaAs mmWave component space, though more focused on amplifier ICs than VDI's planar Schottky diode specialization.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

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Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Virginia Diodes