Huiyan HY-BH26FA & HY-BH22FA 2450 MHz High-Power Microwave Circulator

Overview

The Huiyan HY-BH26FA and HY-BH22FA are high-power, fixed-frequency microwave circulators engineered for industrial and scientific applications operating at the ISM band center frequency of 2450 MHz. These devices utilize ferrite-based non-reciprocal electromagnetic coupling within a precisely biased magnetic field to enforce unidirectional signal flow—enabling isolation between transmitter output and reflected energy in high-power RF systems. Designed for continuous-wave (CW) operation in demanding environments such as microwave heating, plasma generation, particle accelerator beamline conditioning, and industrial drying systems, each unit complies with fundamental waveguide propagation standards for TE₁₀ mode dominance and maintains mechanical and thermal stability under sustained power loads up to 15 kW.

Key Features

• Ferrite core assembly with optimized yttrium iron garnet (YIG)-based composition for stable non-reciprocal phase shift at 2450 MHz
• Two standardized waveguide interface options: BJ-26 (WR-340, 86.36 mm × 43.18 mm) for higher power variants and BJ-22 (WR-430, 109.22 mm × 54.61 mm) for ultra-high-power configurations
• Insertion loss maintained at ≤0.3 dB across full rated power range, minimizing system-level efficiency degradation
• Isolation exceeding 20 dB ensures robust protection of magnetron or solid-state RF sources from reflected power-induced thermal stress and frequency pulling
• VSWR ≤1.2 guarantees minimal mismatch-induced standing waves in connected transmission lines, supporting long-term reliability in resonant cavity systems
• Thermally conductive aluminum alloy housing with integrated heat-sink fins and optional water-cooling manifold ports (for 5 kW+ models)
• Permanent magnet biasing system with temperature-compensated NdFeB magnets, eliminating need for external electromagnet control circuitry

Sample Compatibility & Compliance

These circulators are compatible with standard WR-340 and WR-430 rectangular waveguides per IEEE Std 178-1984 and IEC 60153-2. Mechanical flange dimensions conform to UG-39/U (BJ-26) and UG-43/U (BJ-22) specifications. Units are manufactured and tested in accordance with MIL-STD-202G Method 204 (thermal shock), Method 210 (vibration), and Method 215 (humidity). While not certified to specific regulatory frameworks (e.g., FCC Part 18 or CE RED Directive), their performance parameters align with typical requirements for Class A industrial RF equipment per CISPR 11 Group 2, Class A emission limits. Documentation includes traceable calibration reports for insertion loss, isolation, and VSWR at nominal frequency and rated power levels.

Software & Data Management

As passive RF components, the HY-BH26FA and HY-BH22FA require no embedded firmware, driver software, or digital interfaces. Performance verification is conducted using calibrated vector network analyzers (e.g., Keysight PNA-X series) operating in S-parameter mode. Measurement data—including full S₁₁, S₂₁, S₃₂, and S₁₃ matrices—is exportable in Touchstone (.s3p) format for integration into electromagnetic simulation workflows (CST Studio Suite, Ansys HFSS). For quality assurance and audit readiness, test records comply with GLP principles: timestamped results, operator ID, environmental conditions (ambient temperature ±2°C, humidity <70% RH), and instrument calibration status are retained per batch lot.

Applications

• Microwave thermal processing systems (food pasteurization, rubber vulcanization, ceramic sintering)
• Industrial plasma sources for thin-film deposition (PECVD), surface activation, and waste gas treatment
• High-power klystron and magnetron amplifier protection circuits in radar transmitters and RF linear accelerators
• Load-matching networks in multi-source microwave combiners for distributed heating arrays
• Reflection-mode material characterization setups where incident and scattered fields must be spatially separated
• Research-grade ECR (electron cyclotron resonance) plasma chambers requiring directional power routing

FAQ

What waveguide standards does the HY-BH26FA support?

It conforms to BJ-26 (WR-340) with UG-39/U flange interface per MIL-DTL-3922/67C.
Can this circulator operate at frequencies outside 2450 MHz ±25 MHz?

Performance degrades rapidly beyond this bandwidth; it is not tunable and should not be used outside its specified frequency window.
Is water cooling mandatory for 10 kW operation?

Air cooling is sufficient for intermittent duty cycles below 30% duty factor; continuous 10 kW operation requires active water cooling with ≥3 L/min flow rate and inlet temperature ≤25°C.
Does the device meet RoHS or REACH compliance?

Yes—lead-free solder, halogen-free PCB substrates (where applicable), and cadmium-free magnets are used per Huiyan’s Declaration of Conformity (DOC-2023-HY-RF-087).
How is isolation measured during factory testing?

Using a calibrated VNA with thru-reflect-line (TRL) calibration; isolation is defined as |S₂₃| in dB when port 1 is terminated and port 2 is driven.