GRAPHICAL-METHOD IN STUDYING LOSSY TRANSMISSION-LINES AND LAYERED ABSORBER

The locus of an impedance or admittance function for a lossy transmiss ion line when plotted on a Smith chart is a spiral. In this paper, an alternative presentation is given by means of a new chart, designated as the A-B/R-X chart. The spiral is then replaced by a circular path a nd one linear path to relate the input impedance and the load impedanc e of a lossy line. Another graphical solution is given in the design o f a multiple layered absorber placed in front of a conducting plane to reduce the reflection.