matching stub

matching stub

[′mach·iŋ ‚stəb]
(electromagnetism)
Device placed on a radio-frequency transmission line which varies the impedance of the line; the impedance of the line can be adjusted in this manner.
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References in periodicals archive ?
Numbered tickets were distributed to the anxious crowd members, who then waited apprehensively as Deputy Selina Norwood drew matching stubs from a fishbowl to determine the winners.
In the new design, tuning takes place using a microprocessor-controlled stepper motor that automatically moves impedance matching stubs to the optimum position for given plasma conditions.