b. The dielectric loss of air is so small that we can ignore it. Air
is the only dielectric contained in waveguide; therefore, waveguide has
negligible dielectric loss.
c. The third kind of loss most RF transmission lines have is radiation
14. Why waveguide does not have radiation loss.
at tight angles around the conductor.
electric field, and both these fields are radiated into space.
radiation is a loss of energy except in applications where we want to
radiate energy out into space, such as with an antenna.
energy. We call this loss of energy radiation loss.
c. Energy traveling through waveguide is contained within the walls of
the waveguide. All current flow is on the inside surface of the walls, and
no energy can go out into space. Hence, waveguides have no radiation loss.
slight losses of waveguide. Table III shows this comparison and also shows
the frequency bands for waveguide and the other various types of