A circulator is a three-port, non-reciprocal component that routes RF energy in one direction only—for example, from Port 1 to Port 2, Port 2 to Port 3, and Port 3 back to Port 1. In real systems, circulators protect power amplifiers from reflected power, allow one antenna to be shared for transmit/receive, and provide clean isolation for test & measurement.

A true circulators manufacturer is not only assembling metal housings and magnets. The performance you see in a data sheet—low insertion loss, high isolation, VSWR, power handling and temperature stability—starts from:

• Ferrite material design and magnetics know-how.
• Microwave structure design (microstrip, stripline, waveguide, coaxial transitions).
• Precision machining, plating and automated assembly lines.
• Careful calibration and 100 % RF testing.

With more than a decade in RF/microwave manufacturing, HzBeat focuses on ferrite circulators and isolators only. This narrow focus allows us to combine 20 MHz–200 GHz frequency coverage with miniaturized sizes, wide bandwidth options and stable supply for global customers.

Our circulators portfolio is organized by structure so that engineers and buyers can quickly match the right device to their integration method:

2.1 Microstrip Circulators (PCB & SMT)

Microstrip circulators are designed for direct integration on RF PCBs or surface-mount assembly. Typical use cases include T/R modules, phased arrays, small cells and compact SatCom terminals.

• Frequency coverage: typical 2.0–6.0 GHz, 6.0–18.0 GHz, with options in S, C, X and Ku band.
• Form factors: typical, broadband, miniaturized and SMT packages.
• Benefits: smallest footprint, easy routing to microstrip lines, excellent for high-density designs.

Learn more: Microstrip Circulator Series

2.2 Drop-In Circulators (Stripline Modules)

Drop-in circulators use stripline structures inside a metal housing. They are popular where designers need higher power, better shielding and straightforward module assembly.

• Frequency coverage: from VHF/UHF bands up to several GHz, including broadband options.
• Form factors: typical, broadband and SMD drop-in versions.
• Benefits: good power handling, stable performance, convenient screw-down mounting and welding to carrier boards.

Learn more: Drop-In Circulator Portfolio

2.3 Coaxial Circulators (Connectorized)

Coaxial circulators use SMA, N-type or other RF connectors and are ideal for rack-mount equipment, outdoor units and flexible setups built around cables.

• Frequency coverage: typical models from 0.1–0.4 GHz up to 6–18 GHz.
• Benefits: plug-and-play integration, high power capability, convenient for lab and system-level upgrades.

Learn more: Coaxial Circulator Series

2.4 Waveguide Circulators (High-Power & High-Frequency)

For high-power radar, scientific instruments and high-frequency microwave links, we provide junction and ridge waveguide circulators and isolators that can reach into millimeter-wave bands.

• Frequency coverage: from microwave up into mmWave, depending on waveguide size.
• Benefits: very high power handling, low loss and excellent isolation in band.

Learn more: Waveguide Circulator Solutions

Because we focus only on RF circulators and isolators, our manufacturing and design teams support a wide range of application scenarios:

• Communication Systems: base stations, repeaters, microwave backhaul, small cells and 5G/6G radios.
• Satellite & Space: ground stations, BUC/LNB modules, maritime and aero terminals.
• Radar & Defense: phased-array radar, fire-control radar, electronic warfare and spectrum monitoring.
• Medical & Industrial: MRI RF chains, industrial heating, scientific instruments.
• RF Test & Measurement: lab test benches, production test fixtures and automated RF test systems.

For each sector, we support different power levels (from low-power receivers to high-power transmitters), environmental requirements and mechanical formats, helping buyers standardize on a reliable circulators manufacturer.

When you select a circulators manufacturer, you are also selecting their process control. At HzBeat we put a lot of emphasis on:

• Ferrite and magnetic circuit design: proprietary ferrite formulations and magnet stacks tuned for isolation, loss and temperature stability.
• Automated production lines: controlled soldering, bonding and assembly processes to keep lot-to-lot variation low.
• Full RF testing: key parameters—S-parameters, insertion loss, isolation, VSWR—are checked across the specified band.
• Traceability: batch-level tracking and data for long-term programs and quality audits.

For strategic projects we can share additional test data under NDA so that your engineering and quality teams have full confidence in the supplied components.

Many projects cannot be solved with catalogue parts only—especially when you face unique frequency plans, tight mechanical envelopes or extreme environments. HzBeat therefore provides:

• Custom designs: adjusted frequency band, bandwidth, power rating, rotation direction, interface (microstrip pads, drop-in outlines, connectors, waveguide flanges) and size.
• ODM programs: dedicated R&D support for long-cycle, high-difficulty projects where we co-develop the circulator with your team and lock parameters for mass production.
• Prototype-to-mass-production pathway: from early engineering samples and small pilot batches to fully automated mass production once the design is frozen.

If you are planning a new platform or next-generation module, you can send us your system block diagram, target band and power level. Our engineers will recommend an existing model or propose a tailored circulator with clear performance margins.

Learn more or submit a requirement: Customized RF Circulators & Isolators

When buyers search “circulators manufacturer” on Google, they usually compare several suppliers. We suggest checking at least the following points:

1. Core focus: Is the company specialized in RF circulators/isolators, or are these only a small part of a very broad catalog?
2. Frequency coverage: Does the portfolio cover your current bands and expected future bands (for example 20 MHz–200 GHz)?
3. Structural coverage: Are microstrip, drop-in, coaxial and waveguide all available, so that you can standardize with one partner?
4. Data sheets and test capability: Are S-parameter data, power ratings and environmental limits clearly specified and backed by real measurement?
5. Manufacturing scale: Does the manufacturer operate automated lines and have experience with long-term, high-volume orders?
6. Customization & ODM: Can they support long-cycle, high-difficulty projects with dedicated engineering resources?
7. Support responsiveness: Are RF engineers available to help with selection, matching, installation and failure analysis?

By using this checklist, you can reduce project risk and quickly identify manufacturers that are able to support both today’s needs and future platform upgrades.

Q1. What is the difference between a distributor and a circulators manufacturer?

A distributor mainly resells components from different brands, while a circulators manufacturer designs and produces the devices in-house. Working directly with a manufacturer like HzBeat gives you more control over customization, quality feedback and long-term supply.

Q2. What types of circulators does HzBeat manufacture?

We manufacture microstrip, drop-in, coaxial and waveguide circulators (and matching isolators) covering approximately 20 MHz–200 GHz, with typical catalogue bands from VHF/UHF up to Ku/mmWave depending on structure. This allows us to support low-frequency high-power systems as well as compact high-frequency modules.

Q3. Can you customize circulators for long-cycle, high-difficulty projects?

Yes. We provide customization and can run dedicated ODM programs for long-cycle, high-difficulty projects—for example multi-band radar front-ends, complex SatCom terminals or long-lifecycle industrial equipment. We work with your engineers to define the target band, power, outline and interface before locking a design for mass production.

Q4. What information should I provide when requesting a quotation?

To speed up selection and quotation, please share frequency band, bandwidth, power level (CW and peak if relevant), expected VSWR, isolation target, operating temperature, structure preference (microstrip, drop-in, coaxial, waveguide) and annual volume. If you already have a block diagram or layout, that also helps our team recommend the best option.

Q5. How do you support engineers after delivery?

Our team can provide installation guidance (direction, matching, heat dissipation), basic simulation support, failure analysis and replacement recommendations. For strategic customers we can also align test procedures and share additional data under NDA.

About the Author

HzBeat Editorial Content Team

Marketing Director, Chengdu Hertz Electronic Technology Co., Ltd. (Hzbeat)
Keith has over 18 years in the RF components industry, focusing on the intersection of technology, healthcare applications, and global market trends.

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