3-15Q20.All the power sent down a transmission line from a transmitter can be transferred to an antennaunder what optimum conditions?Q21.What symbol is used to designate the characteristic impedance of a line, and what two variablesdoes it compare?Characteristic Impedance and the Infinite LineSeveral short sections, as shown in figure 3-15, can be combined to form a large transmission line, asshown in figure 3-16. Current will flow if voltage is applied across points K and L. In fact, any circuit,such as that represented in figure 3-16, view A, has a certain current flow for each value of appliedvoltage. The ratio of the voltage to the current is the impedance (Z).Recall that:Figure 3-16.—Characteristic impedance.