The primary advantage of using a rectangular waveguide over other transmission line types is
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Rectangular waveguides are ideal for high-power applications, providing better efficiency and power handling capability than coaxial cables or other transmission lines.
Rectangular waveguides are favored for high-power transmission because they can handle higher power levels compared to other types of transmission lines. The physical dimensions and materials used in waveguides allow them to effectively contain and transmit high power without significant losses.