8/11/2023 0 Comments How to read a smith chartIn the quite rare case of lossy RF lines, an inward spiral must be drawn instead of the circle, with the aid of the scales shown in Figure 7-12 below the chart. The various circles and coordinates have been chosen so that conditions on a line with a given load (i.e., constant SWR) correspond to a circle drawn on the chart with its center at the center of the chart. This means that tangents drawn to the circles at the point of intersection would be mutually perpendicular. A careful look at the way in Which the circles intersect shows them to be orthogonal. The arcs of circles, to either side of the straight line, similarly correspond to various values of normalized line reactance jx = jX/Z 0. The complete circles, whose centers lie on the only straight line on the chart, correspond to various values of normalized resistance (r = R/Z 0) along the line. It consists of two sets of circles, or arcs of circles, which are so arranged that various important quantities connected with mismatched transmission lines may be plotted and evaluated fairly easily. Description The polar impedance diagram, or Smith Chart for Transmission Line as it is more commonly known, is illustrated in Figure 7-12.
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