Figure 108. Rectangular Pipe Constructed
From Quarter-Wave Stubs.
b. Notice that what we have constructed is a hollow, rectangular pipe,
or duct.
Electrically, we have a rectangular duct that is a little over
one-half wavelength wide, and a little less than one-quarter wavelength
high. We can make the duct as long as we want. This is the most common
type of plumbing used to guide RF waves at microwave frequencies.
Regardless of the position of the waveguide, the shorter dimension is always
called height, and is denoted by the letter A (Figure 109).
The longer
dimension is called the width, and is denoted by the letter B (Figure 109).
Figure 109.
Dimensions of Waveguide Determine Power and Frequency.
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