Waveguides WR430 / WR430 / WR284

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Every industrial or research microwave system relies on an individually designed waveguide assembly. MARKOM designs, manufactures and supplies waveguide components in selected standards. Rectangular waveguides are the most widely used type:

• WR284, WR340 and WR430 standards (others available),
• straight sections of any length and bent sections at any angle in the E-plane or H-plane,
• launchers matched to magnetron type and microwave power,
• 3-stub tuners, isolators, directional couplers for VSWR monitoring, fixed and adjustable shorts,
• vacuum and pressure microwave waveguide windows, including UHV systems.

Examples of completed orders can be found on the website Projects

The basic building block of any waveguide assembly, available in lengths from 0.1 to 1.0 metre. Length and other requirements are specified at the time of order. Each section is fitted with precision-milled flanges compliant with the relevant standard.

Construction:

• Material: aluminium (AW-6061/6082); on request: brass (MO58A), oxygen-free copper (OFC/OFHC) or stainless steel (304/316)
• Flange type: flat, with gasket, or with gasket and groove providing microwave leakage protection
• Finish: powder coating (aluminium) / polishing (aluminium, brass, copper, steel)

Catalogue card

When the waveguide assembly requires a change of direction, bent waveguide sections are used. One example is their application in microwave generators for drying of buildings. Depending on requirements, two types are available:

• H-plane bend — for horizontal direction changes (left/right)
• E-plane bend — for vertical direction changes (up/down)

Standard bend angles are 30°, 45° and 90°, with low insertion loss. MARKOM can design and manufacture bent waveguides at any required angle.

Construction:

• Material: aluminium (AW-6061/6082); on request: brass (MO58A), oxygen-free copper (OFC/OFHC) or stainless steel (304/316)
• Flange type: flat, with gasket, or with gasket and groove providing microwave leakage protection
• Finish: powder coating (aluminium) / polishing (aluminium, brass, copper, steel)

In microwave systems, changes in waveguide standard, cross-section or profile are often required:

• In low-pressure plasma generation systems, reducing the waveguide profile (tapered waveguide) increases plasma excitation efficiency
• In industrial production lines, waveguides of different standards can be matched without impedance disruption or energy loss, maintaining continuity of the waveguide assembly

Construction:

We design and manufacture waveguide transitions for multiple standard pairs (e.g. WR430→WR340 or WR340→WR284). The primary material is aluminium AW-6082; brass, stainless steel and oxygen-free copper are available on request. Components are precision-milled, ground and polished. Joining method is selected according to the application — vacuum, pressure or high-power transmission.

The launcher connects the magnetron to the waveguide assembly and ensures efficient transfer of microwave energy to the process chamber. MARKOM designs and manufactures launchers for CW magnetrons in power ratings of 1.5 / 3 / 6 / 10 kW. They are an integral part of every MARKOM magnetron head. The shape, dimensions and material of the launcher are selected individually according to the power level, magnetron type and application.

Construction:

• Material: aluminium 6061/6082 or stainless steel 304/316
• Joining method: laser welding (standard) or TIG welding (where increased mechanical strength is required)
• Mounting flange: compliant with the waveguide standard in use
• Optional flange seal protecting the waveguide interior against contamination and microwave leakage

Catalogue card