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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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.
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waveguide is a metal pipe that contains and guides microwaves from place to place in a microwave system (e.g. oscillators, amplifiers, mixers, modulators, filters, antennas)
horn antenna has a waveguide connected at its focus, in transmit mode the waveguide feeds the horn which then emits a microwave beam, in receive mode the horn collects a microwave beam and concentrates it int the waveguide
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Horn antenna are typically fed by a section of a waveguide, the
waveguide itself is often fed with a short dipole.