Figure 64. E and H field distribution in a
waveguide.
c. If two walls are placed perpendicular to
the conducting planes, as shown in C of figure 63,
the E lines will be parallel with the sidewalls and
perpendicular to the top and bottom walls. And it
appears as though the H lines are perpendicular to
Figure 63. Electromagnetic lines, free and confined.
the sidewalls. The rule in paragraph 1-5b states that
E lines parallel to a conductor and H lines
perpendicular to a conductor cancel out. Because of
this, the E lines are maximum at the center of the waveguide with a sinusoidal distribution between the sidewalls
and the center of the waveguide. The magnetic field, however, remains parallel with the sidewalls
by turning through a right angle near each wall, -as shown in D of figure 63. The H lines form
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