The Relation between Nodal Positions and Standing Wave Ratio in a Composite Transmission System

Reflection generally occurs at a lossless transition region joining two uniform lossless lines. If the output line feeds into a matched load (no reflection) a standing wave ratio η0 different from unity exists on the input side of the transition region. If the output line is terminated by a movable short circuit, a relation exists between the nodal positions on opposite sides of the transition section. The relation can be used to determine η0 thus dispensing with the need for a calibrated detecting system to measure this quantity.