Coupled-line circuit with adjustable input conductance
S.R. Mazumder, Fred E. Gardiol · Electronics Letters · 1979
A new matching circuit was developed, for which the input conductance (real part of the input admittance) can be adjusted by simply changing the length of one open-ended stub. This circuit can be utilised for matching of microstrip devices as well as for tuning of solid-state amplifiers and oscillators (such as transistors, Impatt or Gunn diodes).