Custom Waveguide Components – BJ-9, BJ-22, and BJ-26 Rectangular Straight Waveguides

Overview

These precision-engineered rectangular straight waveguides conform to the IEEE Standard 178 (formerly MIL-STD-1543) and IEC 60154-2 specifications for standard WR-waveguide designations. The BJ-9, BJ-22, and BJ-26 series correspond respectively to WR-90 (X-band), WR-28 (Ka-band), and WR-22 (K-band) dimensional families—enabling broadband RF and microwave signal transmission in test benches, radar subsystems, satellite communication feeds, and high-power amplifier interconnects. Each waveguide is manufactured to tight mechanical tolerances (±0.02 mm on critical internal dimensions) and features a smooth, low-roughness interior surface finish (<0.4 µm Ra) to minimize insertion loss and higher-order mode excitation. The fundamental propagation mode supported is TE₁₀, with cutoff frequencies defined by the broad-wall width (a-dimension); for example, BJ-9 (WR-90) operates from 8.2 to 12.4 GHz, BJ-22 (WR-22) from 33.0 to 50.0 GHz, and BJ-26 (WR-28) from 26.5 to 40.0 GHz.

Key Features

• Standardized flange interfaces per UG-39/U (BJ-9), UG-599/U (BJ-22), and UG-598/U (BJ-26) military specifications—ensuring mechanical and electrical compatibility with legacy and modern test equipment including Keysight PNA-X, Rohde & Schwarz ZVA, and Anritsu VectorStar systems
• Material-selectable construction: 6061-T6 aluminum (lightweight, cost-effective, anodizable), oxygen-free high-conductivity (OFHC) copper (lowest RF loss, ideal for high-Q cavities or low-noise receiver front-ends), or 304/316 stainless steel (corrosion resistance, vacuum compatibility, bake-out capable to 150 °C)
• Electroplated finishes available: silver plating (≥99.9% purity, typical thickness 5–8 µm) for maximum conductivity; gold plating (0.5–1.0 µm, Ni underplate) for oxidation resistance in humid or saline environments
• Custom length options from 50 mm to 2,000 mm, with optional internal chamfering, flange hole pattern adaptation (e.g., ISO-KF, CF-35), and vacuum-tight welding seams certified to Helium leak rate ≤1×10⁻⁹ mbar·L/s
• Dimensional traceability: each unit supplied with a Certificate of Conformance (CoC) referencing ISO/IEC 17025-accredited metrology reports for critical cross-section measurements (a, b, wall thickness, flange flatness)

Sample Compatibility & Compliance

This waveguide family supports seamless integration into both laboratory-grade and industrial RF environments. All models comply with RoHS 2015/863/EU and REACH SVHC regulations. Aluminum and copper variants meet MIL-DTL-3922/71B for electromagnetic shielding effectiveness (>100 dB at 1 GHz). Stainless steel configurations are compatible with ultra-high vacuum (UHV) systems and satisfy ASTM E595 outgassing requirements (TML ≤1.0%, CVCM ≤0.1%). Flange gasket grooves accept standard elastomeric (Viton, silicone) or metal (copper, aluminum) C-rings, enabling operation across temperature ranges from −65 °C to +125 °C (aluminum), −269 °C to +200 °C (copper), or −270 °C to +400 °C (stainless steel).

Software & Data Management

While inherently passive components, these waveguides are fully supported within industry-standard electromagnetic simulation workflows. S-parameter files (Touchstone .s2p format) are available upon request for each custom configuration, generated via HFSS or CST Studio Suite using validated material permittivity/permeability and surface roughness models. Integration with Keysight PathWave ADS, Cadence AWR Microwave Office, and Ansys HFSS allows accurate cascaded network analysis—including mismatch loss, group delay variation, and modal purity assessment. For traceability and quality control, manufacturing data (material lot numbers, plating bath logs, CMM measurement records) are archived for 10 years in accordance with ISO 9001:2015 Clause 8.5.2.

Applications

• Radar antenna feed networks requiring phase-stable, low-loss transmission paths in airborne and ground-based systems
• Calibration standards for vector network analyzer (VNA) error correction—particularly as thru-reflect-line (TRL) reference standards
• High-power microwave (HPM) pulse transmission where thermal management and arcing threshold are critical (copper and stainless steel variants preferred)
• Cryogenic RF interconnects in quantum computing dilution refrigerators (stainless steel with low-thermal-conductivity flange insulation)
• EMC/EMI test chamber waveguide feedthroughs compliant with CISPR 16-1-4 and ANSI C63.4

FAQ

What is the maximum average power handling capacity for BJ-26 waveguides made from OFHC copper?
Typical continuous-wave (CW) power rating is 25 kW at 26.5 GHz, assuming forced-air cooling and VSWR ≤1.05. Derating applies above 35 GHz due to skin-depth reduction and ohmic heating.
Can you supply waveguides with non-standard flange types such as CPR-137 or blind-mate configurations?
Yes—custom flange machining (including CPR, CMR, and proprietary OEM patterns) is supported with engineering review and mechanical interface drawings provided prior to fabrication.
Do you offer impedance-matched transitions (e.g., waveguide-to-coaxial or waveguide-to-microstrip)?
Transition components are available separately and engineered to maintain return loss >30 dB over the operating band; full system-level S-parameter characterization is included.
Is surface roughness measurement data provided for high-frequency applications above 40 GHz?
Yes—profilometer scans (per ISO 4287) of internal surfaces are included in the CoC for all orders specifying operation ≥33 GHz.
What documentation accompanies international shipments for customs clearance and technical validation?
Each shipment includes bilingual (English/Chinese) CoC, material test reports (ASTM B152 for copper, ASTM B209 for aluminum), and EU Declaration of Conformity—formatted for direct submission to EU Notified Bodies or U.S. FCC TCBs.