Here’s the clarification you need:
✅ WR-650 is a real, standard rectangular waveguide
- The designation WR-650 refers to a rectangular waveguide with internal broad wall width of 6.50 inches (165.1 mm) and narrow wall height of 3.25 inches (82.55 mm).
- It’s an EIA/IEC/WG standard size designed for L-band RF/microwave use, typically covering roughly 1.15–1.72 GHz with the TE₁₀ mode as the dominant propagation mode.
❌ WR-65 is not a standard rectangular waveguide designation
- There is no standard “WR-65” waveguide in the typical EIA series. If you see “WR-65” mentioned, it’s almost always a mistaken or truncated reference to WR-650 (e.g., someone dropping the trailing zero).
- In standardized naming, the number after “WR” corresponds to the broad wall width in hundredths of an inch (so WR-650 = 650 × 0.01 inch = 6.50 inch).
How the naming works
- “WR-XYZ” → XYZ is the broad wall width × 0.01 inch.
For example:- WR-90 → 0.90 inch wide,
- WR-284 → 2.84 inch wide,
- WR-650 → 6.50 inch wide.
So the confusion boils down to:
- WR-650 is a valid, widely used L-band rectangular waveguide size.
- WR-65 is not standard and likely someone was abbreviating or mis-typing WR-650.
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