Chapter 10, Problem 10.30P

A two-wire line constructed of lossless wire of circular cross section is gradually flared into a coupling loop that looks like an eggbeater. At the point X, indicated by the arrow in Figure 10.34, a short circuit is placed across the line. A probe is moved along the line and indicates that the first voltage minimum to the left of X is 16 cm from X. With the short circuit removed, a voltage minimum is found 5 cm to the left of X, and a voltage maximum is located that is 3 times the voltage of the minimum. Use the Smith chart to determine (a) f; (b) s; (c) the normalized input impedance of the eggbeater as seen looking to the right at point X.

Figure 10.34 See Problem 10.30.