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Figure 1-40A.—Loop coupling in a rectangular waveguide.
Figure 1-40B.—Loop coupling in a rectangular waveguide.
Figure 1-40C.—Loop coupling in a rectangular waveguide.
When less efficient coupling is desired, you can rotate or move the loop until it encircles a smaller
number of H lines. When the diameter of the loop is increased, its power-handling capability also
increases. The bandwidth can be increased by increasing the size of the wire used to make the loop.
When a loop is introduced into a waveguide in which an H field is present, a current is induced in the
loop. When this condition exists, energy is removed from the waveguide.
