HY-Research HY-JL26FB BJ26 Microwave Excitation Cavity (Copper, Nickel-Plated)

Overview

The HY-Research HY-JL26FB is a precision-engineered BJ26 microwave excitation cavity conforming to the IEC 60153-2 and EIA WR340 standard waveguide specifications. Designed for fundamental mode (TE₁₀) operation in the S-band frequency range (2.0–3.3 GHz), this cavity serves as a critical interface component between magnetron output and load systems in industrial microwave heating, plasma generation, and scientific microwave source characterization applications. Constructed from high-conductivity oxygen-free copper (OFHC) and finished with a uniform electroless nickel plating (≥5 µm thickness), the cavity ensures low RF insertion loss, excellent thermal stability, and long-term corrosion resistance under continuous high-power operation (up to 5 kW average power, pulsed or CW). Its mechanical design strictly adheres to the dimensional tolerances defined in MIL-STD-390 and IEEE Std 157-2021 for WR340 rectangular waveguides, enabling seamless integration with standardized flange-mated components.

Key Features

• Exact dimensional compliance with BJ26 (EIA WR340) waveguide standard: inner cross-section 86.36 mm × 43.18 mm, wall thickness 3.18 mm
• Copper substrate (C10200 OFHC, conductivity ≥100% IACS) optimized for minimal ohmic loss and high Q-factor performance
• Electroless nickel plating (Ni-P, 9–11% phosphorus) providing uniform surface resistivity (<15 µΩ·cm), oxidation resistance, and compatibility with vacuum bake-out (≤200 °C)
• Standard FDP26 flange interface per IEC 60153-2, featuring 8×M6 threaded holes on 140 mm bolt circle diameter
• Optimized internal geometry accommodating magnetron anode foot spacing of 114 mm × 35 mm — validated for Panasonic 2M210-M1, 2M167B series; Samsung OM75P31/S31; Wavetek (Vitro) 2M219K/G, 2M363K/G, 2M369K/G, 2M469K/G; LG, Toshiba, and Hitachi OEM magnetrons
• Mechanically robust construction with CNC-machined cavity body and stress-relieved flange mounting surfaces to maintain RF sealing integrity under thermal cycling

Sample Compatibility & Compliance

The HY-JL26FB cavity is mechanically and electromagnetically compatible with all commercial S-band magnetrons whose anode pin layout matches the 114 mm × 35 mm center-to-center footprint. It supports both air-cooled and forced-liquid-cooled magnetron configurations when integrated into properly engineered waveguide manifolds. The cavity meets electromagnetic compatibility requirements per EN 61000-6-3 (emission) and EN 61000-6-2 (immunity) when installed with certified RF gaskets and grounding straps. While not certified to UL/CSA standards as a standalone component, it is routinely deployed in systems compliant with IEC 60204-1 (safety of machinery) and ISO 13849-1 (PLd functional safety) when embedded within full-system interlocks and shielding architectures.

Software & Data Management

As a passive RF component, the HY-JL26FB does not incorporate embedded firmware or digital interfaces. However, it is fully interoperable with industry-standard microwave system monitoring platforms including Keysight PathWave RF Synthesis, Ansys HFSS-based cavity resonance modeling workflows, and NI LabVIEW-driven VNA calibration suites (e.g., Keysight PNA-X, Rohde & Schwarz ZVA). Users may perform S-parameter characterization (S₁₁, S₂₁) across 2–3.3 GHz using vector network analyzers traceable to NIST standards. Calibration data, mechanical drawings (STEP/IGES), and material certification reports (mill test reports per ASTM B152 for copper, ASTM B656 for Ni-P plating) are provided upon order fulfillment to support GLP-compliant documentation and equipment qualification (IQ/OQ).

Applications

• Industrial microwave drying and sintering systems requiring stable, low-VSWR excitation coupling
• Plasma torch ignition and sustained plasma confinement in atmospheric and low-pressure environments
• Calibration reference cavities for magnetron output power measurement via calorimetric or diode-based methods
• R&D test fixtures for evaluating magnetron aging, mode stability, and frequency pulling under load variation
• Modular microwave generator subsystems in food processing, rubber vulcanization, and ceramic curing lines
• Academic and national lab setups for microwave-material interaction studies at S-band frequencies

FAQ

Is the HY-JL26FB cavity suitable for vacuum environments?
Yes — the nickel-plated copper construction and absence of organic adhesives or coatings allow safe operation in high-vacuum systems (10⁻⁶ mbar) following standard outgassing protocols.
What is the maximum recommended input power level?
For continuous-wave (CW) operation, the cavity is rated for up to 5 kW average power with adequate cooling airflow (>3 m/s over external surfaces); pulsed operation (duty cycle ≤10%) supports peak powers up to 25 kW.
Does HY-Research provide flange gaskets or RF sealing hardware?
Standard conductive elastomer gaskets (silver-coated aluminum filler, ASTM D1056 Grade 2BF) and stainless steel flange bolts are available as optional accessories with traceable material certifications.
Can this cavity be modified for TE₂₀ or TM₁₁ mode operation?
No — the internal dimensions and tuning structure are fixed for fundamental TE₁₀ resonance; custom-mode cavities require re-engineering and are offered separately under HY-Research’s OEM design service.
Is RoHS and REACH compliance documented?
Yes — material declarations and SVHC screening reports per EU Directive 2011/65/EU and Regulation (EC) No 1907/2006 are supplied with each shipment.