Rectangular Waveguide - TE10; (TM11 in case of TM waves)
Circular Waveguide - TE11;
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Circular waveguides offer implementation advantages over
rectangular waveguide in Calculations for circular waveguide
requires the application of Bessel.
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50% Coupler :D
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Moisture in the air in a waveguide can scatter the microwave
energy the waveguide is designed to transport. This translates into
signal loss or attenuation. The VSWR drops, and that is not a good
thing.