WR-90 waveguide
The WR-90 waveguide is a rectangular waveguide commonly used for microwave signals, particularly in the X-band frequency range.
Here’s a quick technical summary:
| Parameter | Value |
|---|---|
| Waveguide size (inside) | 0.900 in × 0.400 in (22.86 mm × 10.16 mm) |
| Frequency range | 8.2 GHz – 12.4 GHz |
| Recommended center frequency | ~10 GHz |
| Cutoff frequency (TE₁₀) | ≈ 6.56 GHz |
| Flange standard | UG-39/U, UG-135/U (varies by variant) |
| Material | Typically aluminum, brass, or copper |
| Dominant mode | TE₁₀ |
Typical Applications
- Radar systems (marine, aviation, defense)
- Satellite communications
- Test and measurement setups
- Laboratory microwave experiments
Common Components
- Straight sections (various lengths)
- Twists (90° or custom)
- Bends (E-plane, H-plane)
- Transitions to coaxial (e.g., SMA or N-type)
- Couplers, attenuators, terminations
Notes for Practical Use
- The wider wall supports the electric field in the dominant TE₁₀ mode.
- Keep bends smooth (or use proper E/H-plane bends) to minimize reflections and VSWR.
- Flange alignment is critical for good performance.
- Use gaskets or choke flanges to minimize leakage.