Figure 77. PRIMARY Mode of Oscillation
During Second Half Cycle.
14. The main points to remember about the fields of a resonant cavity.
a. The energy in a resonant cavity is contained in its electric (E) and
magnetic (H) fields.
b. The E and H fields are always perpendicular to each other.
c. The way in which the fields are positioned within the cavity is
called the mode of operation.
d. For the PRIMARY mode of operation, the length and width of a
resonant cavity is one-half wavelength and the height is less than one-half
e. We have discussed how the size of a cavity determines its resonant
frequency. Now, let's see how size applies to tuning.
15. Methods of tuning a resonant cavity.
a. There are four principal methods of tuning a resonant cavity using
the following:
(1) A movable plunger.
110
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