Figure 123.
Twisted Section of Waveguide.
26. Next, flexible waveguide.
a. Flexible waveguide, like the section shown in Figure 124, is used
when a special type of bend is needed, or because of its adaptability to any
bend. This type of flexible waveguide consists of many loops of flat metal
ribbon.
Each loop has electrical contact with the loop next to it.
A
rubber sheath surrounds the loops and holds them in place. Notice that the
inside of the flexible section presents some surfaces at right angles to the
field traveling down the guide. These slight obstructions cause the field
to be reflected and there is some loss of energy. For this reason, flexible
waveguide sections are not used very often, except in cases where this loss
of energy causes no problems. One such case is where we take just a sample
of the energy and feed it to test equipment.
Figure 124.
Flexible Waveguide.
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