double-stub tuner

double-stub tuner

[¦dəb·əl ‚stəb ′tün·ər]
(electromagnetism)
Impedance-matching device, consisting of two stubs, usually fixed three-eighths of a wavelength apart, in parallel with the main transmission lines.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.