b. In appearance, some waveguides look just like the water pipes in a
house. This is why repairmen sometimes call waveguides RF plumbing or just
plumbing.
c. In this lesson you will see how waveguide works and learn why it is
used at microwave frequencies.
You will also see different forms such as
straight waveguide, twisted waveguide, and waveguide bends. Before looking
at the construction of waveguide, let's review some transmission line
characteristics that will help you understand waveguide operation.
4.
Characteristics of a shorted quarter-wavelength section.
Figure 106 shows the characteristics of shorted quarter-wavelength
and half-wavelength sections of transmission line.
The shorted quarter-
wavelength section of transmission line shown in Part A of Figure 106
appears as an open circuit at the generator end. The end that appears open
across it.
Figure 106. Characteristics of Short-Circuited
Transmission Line Sections.
5.
Characteristics of a shorted half-wavelength section.
a.
The shorted half-wavelength section of transmission line shown in
Part B
of Figure 106, appears as a short circuit at both ends.
It has
maximum
impedance at the center of the line. When energized, it has maximum
developed at the center of the line and maximum current flow at each
end.
160
Previous Page
