The E and H Fields One-Half
e. In Figure 111, the fields have changed from a maximum positive
direction to maximum negative direction.
However, the variation is
sinusoidal. That is, they change just as a sine wave of voltage or current
changes from maximum positive to maximum negative.
The big differences
between the fields contained in a resonant cavity and the fields in
waveguide are as follows:
(1) The fields in a resonant cavity are completely reflected and
oscillate until all their energy is dissipated.
Also, the fields in a
resonant cavity are 90 degrees out-of-phase.
(2) The fields in a waveguide differ in that they travel down to the
end of the guide and are absorbed because the guide terminated in its
11. Summing up waveguide field characteristics.
a. The points or areas of maximum electric (E) field in a waveguide are
in the center of the hollow chamber.
(1) These areas of maximum E field occur every half wavelength along
the length of the guide.
(2) The areas of maximum E field are the same areas that have maximum
b. The points or areas of maximum magnetic (H) field in a waveguide are
along the walls of the chamber. The areas of maximum H field are the same