Mi-Wave · Rectangular Waveguide Components
690 Series Straight Waveguide Sections
MIL-SPEC straight rectangular waveguide from 8.2 GHz to 500 GHz
The Mi-Wave 690 Series is straight rectangular waveguide in the standard WR sizes, built from MIL-SPEC tube and flanges, from X-band at 8.2 GHz up to WR-2.2 at 500 GHz. It is the plain transmission element that radar feed networks, satellite feeds, mm-wave test benches and high-power microwave sub-systems are assembled from. Careful control of the geometry keeps discontinuities, distortion and impedance mismatch small, so the loss through a section stays very low. Evencat is an authorized Mi-Wave distributor in Taiwan.
Overview
The 690 Series follows the IEEE/EIA WR designations and lists 14 band models between 8.2 GHz and 500 GHz: X, K, Ka, Q, U, V, E, W, F, D, G, H and J bands plus WR-2.2. Every section uses MIL-SPEC waveguide tube and flanges, and the interfaces are controlled in manufacture so reflection and loss stay low across the band. The flange for each band is the usual one: UG-39/U for X-band, UG-595/U for K, UG-599/U for Ka, UG-383/U for Q and U, and UG-387/U or UG-387/U-M from V-band upward. Typical VSWR runs from 1.06:1 in the lower bands to 1.15:1 at mm-wave. Standard lengths depend on the raw waveguide Mi-Wave has in stock, so confirm the available length before you commit a layout; special lengths, alternative flange arrangements and other conductor materials are quoted to order. Test data is taken at +25 °C case temperature.
Key specifications
| Frequency coverage | 8.2 GHz – 500 GHz (whole series) |
|---|---|
| Models | 690X, 690K, 690A, 690B, 690U, 690V, 690E, 690W, 690F, 690D, 690G, 690H, 690J, 690(2.2) |
| Waveguide (X-band) | WR-90, inside width × height: 0.900" × 0.400", flange UG-39/U, VSWR 1.06:1 |
| Waveguide (K-band, 18–26.5 GHz) | WR-42, inside width × height: 0.420" × 0.170", flange UG-595/U, VSWR 1.06:1 |
| Waveguide (Ka-band, 26.5–40 GHz) | WR-28, inside width × height: 0.280" × 0.140", flange UG-599/U, VSWR 1.06:1 |
| Waveguide (Q-band, 33–50 GHz) | WR-22, inside width × height: 0.224" × 0.112", flange UG-383/U, VSWR 1.06:1 |
| Waveguide (W-band, 75–110 GHz) | WR-10, inside width × height: 0.100" × 0.050", flange UG-387/U-M, VSWR 1.15:1 |
| Waveguide (D-band, 110–170 GHz) | WR-6, inside width × height: 0.065" × 0.0325", flange UG-387/U-M, VSWR 1.15:1 |
| Waveguide (WR-2.2, 325–500 GHz) | WR-2.2, inside width × height: 0.022" × 0.011", flange UG-387/U-M, VSWR 1.15:1 |
| Build standard | MIL-SPEC waveguide tube and flanges |
| Test temperature | +25°C (case temperature) |
| Custom options | Special lengths, alternative flange arrangements, other conductor materials; quoted to order |
Features
Whole-band coverage
One series spans 8.2 GHz to 500 GHz across X, K, Ka, Q, U, V, E, W, F, D, G, H and J bands plus WR-2.2, which serves mm-wave and sub-THz work alike.
MIL-SPEC construction
Tube and flanges meet military specifications, so the mechanical interface is consistent and dependable for aerospace, defense and high-reliability commercial systems.
Low VSWR, low loss
Controlled manufacture keeps discontinuities small: typical VSWR is 1.06:1 from X through Q band and 1.15:1 from V-band to WR-2.2, so reflection loss stays low.
Standard WR interfaces
Every section follows the IEEE/EIA WR rectangular sizes with the matching UG flange, and drops into an existing waveguide run or test chain without adapters.
Made to your length
Special lengths, alternative flanges and other conductor materials are available; standard lengths depend on raw stock, so ask Mi-Wave through us for non-standard pieces.
Broad range of uses
Radar feed networks, Satcom links, mm-wave RF test benches, antenna feeds and high-power microwave sub-systems all build on straight sections like these.
Applications
Satellite communications
Ground-station antenna feed links
In C through Ka band earth stations, straight sections form the low-loss path between the dish feed horn and the LNA, so the weak downlink signal is not eroded before it reaches the receive chain. Standard WR flanges and MIL-SPEC build shorten integration and field replacement.
Radar and defense
Power transport in radar front ends
Phased-array and high-power pulsed radars route mm-wave energy from transmitter to array through straight sections, whose power handling and low insertion loss far exceed coaxial cable, preserving peak output and beamforming accuracy. Sizes from WR-90 (X-band) to WR-10 (W-band) fit surveillance and fire-control platforms.
RF measurement lab
mm-wave VNA test chains
Building fixtures around VNA extenders such as WR-15 or WR-5 heads calls for straight sections of exact length as path extensions or DUT adapters, so the calibration plane can be reproduced and uncertainty kept down. The 690 Series covers every WR size from 8.2 GHz to 500 GHz, so one purchase equips a multi-band bench.
Options and configuration
Tick the band, size and interface you need; the selections are collected into a list and carried into the quote form.
Band and waveguide model
Flange and length
Material
Downloads
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