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 ?
Although the system is not perfectly symmetric due to the orientations of the open matching stubs, the coupling coefficients [S.sub.12] and [S.sub.13] are almost equal to each other.
Series, as well as shunt matching stubs, can be realized and used to reduce the size of planar passive elements.
Finding the impedance [Z.sub.s] = [R.sub.s] + j[X.sub.s] by its real and imaginary parts, [R.sub.s] and [X.sub.s] respectively, is made by applying the method of matching stubs on the antenna feedline.
The quarter-wavelength RF traps introduce a substantial mismatch for the LO signal so additional LO matching stubs are always required.