A rectangular straight waveguide section is simply a finite-length, straight rectangular waveguide with flanges at both ends — the most common “waveguide pipe” in engineering practice.
Structure & Materials
Structural Composition
Cross-section: Standard rectangular dimensions a×b
Length: Various standard lengths (10 cm, 20 cm, 30 cm, 50 cm, 1 m, etc.)
Ends: Fitted with standard flanges (CPR, UG, UBR, etc.)
Inner walls: Copper or aluminum; silver-plated for high-frequency applications
Interior: Air dielectric; may be filled with dry nitrogen for moisture and breakdown protection
Transmission Modes
Supports TE and TM modes: Rectangular straight waveguides only transmit transverse electric (TE) and transverse magnetic (TM) waves.
Dominant mode: TE₁₀ mode: The primary and most widely used propagating mode in rectangular waveguides.
