Figure 112.
Comparing Waveguide and Transmission Lines.
e. Now that you have learned how energy travels along waveguide and why
waveguide is very efficient, let's see how you couple energy into or out of
waveguide.
15. Energy is usually coupled into waveguide with a probe.
a. The most common method of coupling energy into waveguide is with a
probe (Figure 113).
This method is identical to probe coupling into a
resonant cavity.
That is, the probe is placed in the waveguide at the
center of the width (B dimension) and a quarter-wavelength from the end.
This point gives maximum E field in the center of the guide and maximum H
field along the walls of the guide.
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