WR-14 Waveguide
The WR14 waveguide (also known as WH14) is a rectangular waveguide used for millimeter-wave applications in the K-band.
Here are the key technical specifications:
| Parameter | Value |
|---|---|
| Designation | WR14 (WH14) |
| Frequency range (typical) | 22.0 GHz – 33.0 GHz |
| Recommended band center | 27.5 GHz |
| Internal dimensions (a × b) | 0.140 in × 0.070 in (3.556 mm × 1.778 mm) |
| Cutoff frequency (TE₁₀ mode) | ~21.1 GHz |
| Flange types | UG-385/U, UG-385/U-M, UG-599/U (common variants) |
| Typical material | Brass, copper, aluminum |
Characteristics
- Very small cross-section suitable for high-frequency, low-loss signal transmission.
- Operates comfortably in the K-band, often used in 5G, radar altimetry, automotive radar, and research instrumentation.
- WR14 has tight machining tolerances due to the high frequency.
Common Applications
- Millimeter-wave lab setups
- Waveguide feeds for 24–30 GHz radar and communication systems
- Test equipment interconnects (often mated to 2.92 mm or 2.4 mm coaxial connectors via transitions)
- Compact antennas and front-end modules
Important Note
WR14 is much too small for L-band applications such as the 1.420 GHz hydrogen line — its cutoff is over 21 GHz.
For hydrogen line radio astronomy, waveguides like WR650 waveguide or larger are appropriate.