Figure 76. PRIMARY Mode of Oscillation
During First Half Cycle.
b. Now look at Part B of Figure 76.
The dotted lines represent the
magnetic (H) field perpendicular to the electric field.
Consider the
magnetic field as current, although the only current flow is on the inside
surface of the walls.
c. Part C of Figure 76 shows the combination of electric and magnetic
fields of the cavity represented with the voltage and current curves
associated with transmission lines.
This illustration shows the fields
stationary. Actually, the fields are oscillating.
d. Figure 76 shows the fields during one alternation, or one-half
cycle.
During the next half cycle, the direction of the fields reverses.
This is shown in Figure 77.
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