coaxial stub

coaxial stub

[kō′ak·sē·əl ′stəb]
(electromagnetism)
A length of nondissipative cylindrical waveguide or coaxial cable branched from the side of a waveguide to produce some desired change in its characteristics.
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A similar effect can be achieved by loading the patch with an adjustable-length short-circuited coaxial stub,[31] as shown in Figure 2.