b. That completes the coverage on the various forms of waveguide.
Figure 125 summarizes the information on these waveguide components.
Figure 125.
Comparing Waveguide Components.
c. You have learned that we use waveguide sections of various shapes to
change the direction or polarization of the fields. Now you will learn how
to tune waveguides, and how to adjust the power within the waveguide.
27. Methods of tuning waveguide.
a. Waveguide must be tuned just as resonant cavities or transmission
lines must be tuned. Tuning waveguide means that you change its impedance
to match the impedance of the device to which it is connected. This may be
an antenna, a magnetron, or any other RF component.
b. Waveguide tuning methods are similar to those used in tuning
resonant cavities. That is, you change the capacitive reactance so that it
cancels the inductive reactance of the waveguide.
Or, you change the
inductive reactance so that it cancels the capacitive reactance of the
waveguide. The first type of tuning we will consider is that done at the
factory where the waveguide is constructed.
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