Circulators and isolators remain essential ferrite-based components for RF systems in 5G, radar, SATCOM, EW, and microwave links. The supplier map now spans SMT/microstrip drop-ins to heavy-duty waveguide devices, covering frequencies from sub-GHz to 100+ GHz. Major international manufacturers coexist with agile Asian OEM/ODM houses that provide faster customizations and lower-volume flexibility.

Molex — breadth, scale, and options

Molex offers over 6,000 variants from 380 MHz to 40 GHz across drop-in, SMT/microstrip, and waveguide types. They emphasize automated manufacturing for large-scale consistency.

Smiths Interconnect — coaxial, microstrip/SMT, and waveguide up to V-band

Smiths Interconnect serves defense and space markets with high-reliability coaxial and SMT isolators/circulators extending into Ka/V bands.

MACOM — ferrite heritage and infrastructure focus

MACOM maintains a strong ferrite tradition serving wireless infrastructure and radar systems, emphasizing low insertion loss and linearity.

RFCI (RF Circulator Isolator, Inc.) — dedicated ferrite house; ex-RFMD line

RFCI manufactures single and multi-junction ferrite isolators and circulators, with roots in the former RFMD product line.

Micro Harmonics — mmWave isolators and circulators

Micro Harmonics produces millimeter-wave Faraday-rotation isolators up to 400 GHz, focusing on loss reduction and thermal performance for mmWave systems.

Eravant (formerly SAGE Millimeter) — precision mmWave catalog

Eravant’s catalog spans coaxial and waveguide devices up to 325 GHz and supports quick delivery for lab and OEM users.

QuinStar — waveguide specialists

QuinStar provides precision and full-band waveguide circulators/isolators for radar, test, and SATCOM sectors.

Narda‑MITEQ — coaxial and Ka‑band solutions

Narda’s product line offers coaxial isolators/circulators up to ~40 GHz, complementing their broad microwave solutions.

M2 Global — aerospace & SATCOM waveguide designs

M2 Global delivers waveguide dual-junction and pressure-sealed units from 5.8 GHz – 23.6 GHz, used in radar and airborne systems.

DiTom Microwave — in-stock and TVAC‑qualified parts

DiTom provides fast-shipping coaxial isolators with optional thermal-vacuum testing for space-grade applications.

JQL Electronics — full spectrum coverage

JQL Electronics produces microstrip, drop-in, coaxial, and waveguide circulators across 100 MHz–120 GHz, offering strong catalog coverage and flexibility.

UIY Inc. — broad portfolio 0.1 MHz–110 GHz

Shenzhen-based UIY supplies coaxial, drop-in, microstrip, and SMT models. They serve cost‑sensitive programs requiring customized or small-batch builds.

HzBeat — China-based RF Circulator & Isolator Manufacturer

Headquarters: Chengdu, China
Frequency Coverage: 20 MHz – 200 GHz
Product Range: Microstrip, drop‑in, coaxial, waveguide, and SMT
Highlights: Broadband, miniaturized, high‑power ferrite solutions for radar, satellite, and 5G applications
Core Strengths: OEM / ODM customization, small‑batch prototyping, and tailored ferrite designs
Website: www.hzbeat.com

Woken Technology (Taiwan) — regional supplier catalog

Woken lists ferrite isolators and circulators among its microwave components, serving as a regional supplier for Asia-Pacific markets.

• Self-biased/mmWave momentum: new magnet-free ferrite designs reduce reliance on rare-earth materials, improving sustainability.
• Miniaturization & SMT integration: board-level circulators now support compact 5G RF front-ends with low insertion loss.
• mmWave standardization: WR-band catalogs are becoming readily available, simplifying design-in above 26.5 GHz.
• High-rel qualification: more vendors now publish TVAC and thermal-vibration test data for aerospace adoption.

HzBeat focuses on the next generation of ferrite-based components where performance, reliability, and manufacturability meet. Our R&D teams are optimizing ferrite geometry, magnetic biasing, and thermal design to achieve lower insertion loss and broader bandwidth across Ku, Ka, and V bands. As global demand grows for smaller, broadband, and high-power devices, we see immense potential in collaborative OEM/ODM projects combining simulation accuracy with fast prototyping.

• RF circulator and isolator supply is diversifying—multinationals deliver scale; Asian and niche houses deliver agility.
• Customization and high-frequency readiness are key differentiators in 2026 and beyond.
• Self-biased ferrites and integrated mmWave solutions will shape the next innovation wave.

About the Author

HzBeat Editorial Content Team

Sara is a Brand Specialist at Hzbeat, focusing on RF & microwave industry communications. She transforms complex technologies into accessible insights, helping global readers understand the value of circulators, isolators, and other key components.

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